Updated on 2024/07/22

写真a

 
FUJII TOSHIHIRO
 
Organization
Graduate School of Science Department of Physics Associate Professor
School of Science Department of Physics
Title
Associate Professor
Affiliation
Institute of Science
Homepage
https://www.omu.ac.jp/sci/uhelab/
Affiliation campus
Sugimoto Campus

Position

  • Graduate School of Science Department of Physics 

    Associate Professor  2022.04 - Now

  • School of Science Department of Physics 

    Associate Professor  2022.04 - Now

Degree

  • 博士(理学) （ Osaka City University ）

Research Areas

  • Natural Science / Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics

Research Interests

  • 銀河団

  • 超新星爆発

  • 超新星残骸

  • 起源

  • 空気シャワー

  • 異方性

  • 活動銀河核

  • 極高エネルギー

  • 宇宙線

  • 天文学

  • 大気蛍光

  • 化学組成

  • 中性子星

  • ブラックホール

  • パルサー

  • ニュートリノ

  • ダークマター

  • スペクトル

  • ガンマ線バースト

  • ガンマ線

Research subject summary

  • 宇宙空間に存在する高エネルギーの放射線「宇宙線」を研究しています。宇宙線の中でも、宇宙磁場でほとんど曲げられない100エクサ電子ボルトを超えるエネルギーをもつ「極高エネルギー宇宙線」を観測することで、その起源および加速機構の解明を目指しています。国際共同実験によって、宇宙線検出器の観測運用や装置開発、データ解析、そして得られた結果の物理的解釈を進めています。

Professional Memberships

  • THE PHYSICAL SOCIETY OF JAPAN

  • THE ASTRONOMICAL SOCIETY OF JAPAN

Papers

  • Testing hadronic-model predictions of depth of maximum of air-shower profiles and ground-particle signals using hybrid data of the Pierre Auger Observatory

    Abdul Halim A.

    Physical Review D   109 ( 10 )   2024.05（ ISSN:24700010 ）

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  • Constraints on metastable superheavy dark matter coupled to sterile neutrinos with the Pierre Auger Observatory

    Abdul Halim A.

    Physical Review D   109 ( 8 )   2024.04（ ISSN:24700010 ）

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  • Commissioning and the first observation of ISAI, Investigating Solar Axion by Iron-57, experiment

    Onuki Y.

    Proceedings of Science   441   2024.03

  • Radio measurements of the depth of air-shower maximum at the Pierre Auger Observatory

    Abdul Halim A.

    Physical Review D   109 ( 2 )   2024.01（ ISSN:24700010 ）

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  • Demonstrating Agreement between Radio and Fluorescence Measurements of the Depth of Maximum of Extensive Air Showers at the Pierre Auger Observatory

    Abdul Halim A.

    Physical Review Letters   132 ( 2 )   2024.01（ ISSN:00319007 ）

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  • Constraining models for the origin of ultra-high-energy cosmic rays with a novel combined analysis of arrival directions, spectrum, and composition data measured at the Pierre Auger Observatory

    Abdul Halim A.

    Journal of Cosmology and Astroparticle Physics   2024 ( 1 )   2024.01

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  • Observing cosmic-ray extensive air showers with a silicon imaging detector

    Kawanomoto S.

    Scientific Reports   13 ( 1 )   16091   2023.12

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  • An extremely energetic cosmic ray observed by a surface detector array

    R. U. Abbasi, M. G. Allen, R. Arimura, J. W. Belz, D. R. Bergman, S. A. Blake, B. K. Shin, I. J. Buckland, B. G. Cheon, T. Fujii, K. Fujisue, K. Fujita, M. Fukushima, G. D. Furlich, Z. R. Gerber, N. Globus, K. Hibino, R. Higuchi, K. Honda, D. Ikeda, H. Ito, A. Iwasaki, S. Jeong, H. M. Jeong, C. H. Jui, K. Kadota, F. Kakimoto, O. E. Kalashev, K. Kasahara, K. Kawata, I. Kharuk, E. Kido, S. W. Kim, H. B. Kim, J. H. Kim, J. H. Kim, I. Komae, Y. Kubota, M. Y. Kuznetsov, K. H. Lee, B. K. Lubsandorzhiev, J. P. Lundquist, J. N. Matthews, S. Nagataki, T. Nakamura, A. Nakazawa, T. Nonaka, S. Ogio, M. Ono, H. Oshima, I. H. Park, M. Potts, S. Pshirkov, J. R. Remington, D. C. Rodriguez, C. Rott, G. I. Rubtsov, D. Ryu, H. Sagawa, N. Sakaki, T. Sako, N. Sakurai, H. Shin, J. D. Smith, P. Sokolsky, B. T. Stokes, T. S. Stroman, K. Takahashi, M. Takeda, A. Taketa, Y. Tameda, S. Thomas, G. B. Thomson, P. G. Tinyakov, I. Tkachev, T. Tomida, S. V. Troitsky, Y. Tsunesada, S. Udo, F. R. Urban, T. Wong, K. Yamazaki, Y. Yuma, Y. V. Zhezher, Z. Zundel

    Science   382 ( 6673 )   903 - 907   2023.11（ ISSN:0036-8075 ） （ eISSN:1095-9203 ）

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    Publishing type：Research paper (scientific journal)  

    Cosmic rays are energetic charged particles from extraterrestrial sources, with the highest-energy events thought to come from extragalactic sources. Their arrival is infrequent, so detection requires instruments with large collecting areas. In this work, we report the detection of an extremely energetic particle recorded by the surface detector array of the Telescope Array experiment. We calculate the particle’s energy as (~40 joules). Its arrival direction points back to a void in the large-scale structure of the Universe. Possible explanations include a large deflection by the foreground magnetic field, an unidentified source in the local extragalactic neighborhood, or an incomplete knowledge of particle physics.

    DOI： 10.1126/science.abo5095

    PubMed

  • The energy spectrum of cosmic rays measured by the Telescope Array using 10 years of fluorescence detector data

    R.U. Abbasi, Y. Abe, T. Abu-Zayyad, M. Allen, Y. Arai, R. Arimura, E. Barcikowski, J.W. Belz, D.R. Bergman, S.A. Blake, I. Buckland, B.G. Cheon, M. Chikawa, A. Fedynitch, T. Fujii, K. Fujisue, K. Fujita, R. Fujiwara, M. Fukushima, G. Furlich, Z. Gerber, N. Globus, W. Hanlon, N. Hayashida, H. He, R. Hibi, K. Hibino, R. Higuchi, K. Honda, D. Ikeda, N. Inoue, T. Ishii, H. Ito, D. Ivanov, A. Iwasaki, H.M. Jeong, S. Jeong, C.C.H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, S. Kasami, S. Kawakami, K. Kawata, I. Kharuk, E. Kido, H.B. Kim, J.H. Kim, J.H. Kim, S.W. Kim, Y. Kimura, I. Komae, K. Komori, Y. Kusumori, M. Kuznetsov, Y.J. Kwon, K.H. Lee, M.J. Lee, B. Lubsandorzhiev, J.P. Lundquist, T. Matsuyama, J.A. Matthews, J.N. Matthews, R. Mayta, K. Miyashita, K. Mizuno, M. Mori, M. Murakami, I. Myers, S. Nagataki, K. Nakai, T. Nakamura, E. Nishio, T. Nonaka, S. Ogio, H. Ohoka, N. Okazaki, Y. Oku, T. Okuda, Y. Omura, M. Onishi, M. Ono, A. Oshima, H. Oshima, S. Ozawa, I.H. Park, K.Y. Park, M. Potts, M.S. Pshirkov, J. Remington, D.C. Rodriguez, C. Rott, G.I. Rubtsov, D. Ryu, H. Sagawa, R. Saito, N. Sakaki, T. Sako, N. Sakurai, D. Sato, K. Sato, S. Sato, K. Sekino, P.D. Shah, N. Shibata, T. Shibata, J. Shikita, H. Shimodaira, B.K. Shin, H.S. Shin, D. Shinto, J.D. Smith, P. Sokolsky, B.T. Stokes, T.A. Stroman, Y. Takagi, K. Takahashi, M. Takamura, M. Takeda, R. Takeishi, A. Taketa, M. Takita, Y. Tameda, K. Tanaka, M. Tanaka, S.B. Thomas, G.B. Thomson, P. Tinyakov, I. Tkachev, H. Tokuno, T. Tomida, S. Troitsky, R. Tsuda, Y. Tsunesada, S. Udo, F. Urban, I.A. Vaiman, D. Warren, T. Wong, K. Yamazaki, K. Yashiro, F. Yoshida, Y. Zhezher, Z. Zundel

    Astroparticle Physics   151   102864 - 102864   2023.09（ ISSN:0927-6505 ）

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.astropartphys.2023.102864

  • First High-Speed Video Camera Observations of a Lightning Flash Associated With a Downward Terrestrial Gamma-Ray Flash

    R. U. Abbasi, M. M.F. Saba, J. W. Belz, P. R. Krehbiel, W. Rison, N. Kieu, D. R. da Silva, M. A. Stanley, Dan Rodeheffer, J. Remington, J. Mazich, R. LeVon, K. Smout, A. Petrizze, T. Abu-Zayyad, M. Allen, R. Arimura, E. Barcikowski, D. R. Bergman, S. A. Blake, I. Buckland, B. G. Cheon, M. Chikawa, T. Fujii, K. Fujisue, K. Fujita, R. Fujiwara, M. Fukushima, G. Furlich, N. Globus, R. Gonzalez, W. Hanlon, N. Hayashida, H. He, K. Hibino, R. Higuchi, K. Honda, D. Ikeda, N. Inoue, T. Ishii, H. Ito, D. Ivanov, H. Iwakura, A. Iwasaki, H. M. Jeong, S. Jeong, C. C.H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, S. Kasami, S. Kawakami, K. Kawata, I. Kharuk, E. Kido, H. B. Kim, J. H. Kim, J. H. Kim, S. W. Kim, Y. Kimura, I. Komae, Y. Kubota, M. Kuznetsov, Y. J. Kwon, K. H. Lee, B. Lubsandorzhiev, J. P. Lundquist, T. Matsuyama, J. N. Matthews, R. Mayta, I. Myers, S. Nagataki, K. Nakai, R. Nakamura, T. Nakamura, A. Nakazawa, E. Nishio, T. Nonaka, S. Ogio, M. Ohnishi, H. Ohoka, Y. Oku, T. Okuda, Y. Omura, M. Ono, A. Oshima, S. Ozawa, I. H. Park, M. Potts, M. S. Pshirkov, D. C. Rodriguez, C. Rott, G. I. Rubtsov, D. Ryu, H. Sagawa, N. Sakaki, T. Sako, N. Sakurai, K. Sato

    Geophysical Research Letters   50 ( 14 )   2023.07（ ISSN:0094-8276 ） （ eISSN:1944-8007 ）

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    Publishing type：Research paper (scientific journal)  

    In this paper, we present the first high-speed video observation of a cloud-to-ground lightning flash and its associated downward-directed Terrestrial Gamma-ray Flash (TGF). The optical emission of the event was observed by a high-speed video camera running at 40,000 frames per second in conjunction with the Telescope Array Surface Detector, Lightning Mapping Array, interferometer, electric-field fast antenna, and the National Lightning Detection Network. The cloud-to-ground flash associated with the observed TGF was formed by a fast downward leader followed by a very intense return stroke peak current of −154 kA. The TGF occurred while the downward leader was below cloud base, and even when it was halfway in its propagation to ground. The suite of gamma-ray and lightning instruments, timing resolution, and source proximity offer us detailed information and therefore a unique look at the TGF phenomena.

    DOI： 10.1029/2023GL102958

  • Effects of the Galactic Magnetic Field on the UHECR Correlation Studies with Starburst Galaxies

    Ryo Higuchi, Takashi Sako, Toshihiro Fujii, Kazumasa Kawata, Eiji Kido

    The Astrophysical Journal   949 ( 2 )   107 - 107   2023.06（ ISSN:0004-637X ） （ eISSN:1538-4357 ）

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    Publishing type：Research paper (scientific journal)  

    Abstract

    We estimate the biases caused by the coherent deflection of cosmic rays due to the Galactic magnetic field (GMF) in maximum likelihood analyses for searches of ultrahigh-energy cosmic-ray sources in the literature. We simulate mock event data sets with a set of assumptions for the starburst galaxy source model, coherent deflection by a GMF model, and mixed-mass composition. We then conduct a maximum likelihood analysis without accounting for the GMF in the same manner as previous studies. We find that the anisotropic fraction f<sub>ani</sub> is estimated to be systematically lower than the true value. We estimate the true parameters that are compatible with the best-fit parameters that were reported, and find that except for a narrow region with a large anisotropic fraction and a small separation angular scale, a wide parameter space is still compatible with the experimental results. We also develop a maximum likelihood method that takes the GMF model into account and confirm in Monte Carlo simulations that we can estimate the true parameters within a 1σ contour under the ideal condition that we know the event-by-event mass and the GMF.

    DOI： 10.3847/1538-4357/acc739

    Other URL： https://iopscience.iop.org/article/10.3847/1538-4357/acc739/pdf

  • Revisiting ultrahigh-energy constraints on decaying superheavy dark matter

    Das S.

    Physical Review D   107 ( 10 )   2023.05（ ISSN:24700010 ）

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  • Constraining the sources of ultra-high-energy cosmic rays across and above the ankle with the spectrum and composition data measured at the Pierre Auger Observatory

    Abdul Halim A.

    Journal of Cosmology and Astroparticle Physics   2023 ( 5 )   2023.05

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  • Ultra high energy cosmic rays The intersection of the Cosmic and Energy Frontiers

    Coleman A.

    Astroparticle Physics   147   2023.05（ ISSN:09276505 ）

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  • Performance of the TALE infill experiment as a TA-TALE extension down to the PeV region

    Aoi Iwasaki, Keitaro Fujita, Shoichi Ogio, Toshihiro Fujii, Yoshiki Tsunesada

    EPJ Web of Conferences   283   06015 - 06015   2023.04（ eISSN:2100-014X ）

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    Publishing type：Research paper (scientific journal)  

    The TALE infill experiment is a further extension of TA-TALE detectors to observe low-energy cosmic rays down to the PeV region. TALE infill utilizes the existing TALE-FD detectors, and newly developed "infill" surface detectors with 100 m and 200 m spacing. The new detectors will be deployed at the TALE site in October-November 2022. We present the design and performance of the TALE infill array in the hybrid mode, in terms of the resolutions and biases of arrival direction, energy, and X<sub>max</sub>.

    DOI： 10.1051/epjconf/202328306015

  • The energy spectrum of ultra-high energy cosmic rays measured at the Pierre Auger Observatory and the Telescope Array

    D. R. Bergman, O. Deligny, F. Fenu, T. Fujii, K. Fujita, J. H. Kim, I. Lhenry-Yvon, I. Maris¸, Q. Luce, M. Roth, F. Salamida, Y. Tsunesada, V. Verzi

    EPJ Web of Conferences   283   02003 - 02003   2023.04（ eISSN:2100-014X ）

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    Publishing type：Research paper (scientific journal)  

    In the study of cosmic rays, the measurement of the energy spectrum of the primaries is one of the main issues and provides fundamental information on the most energetic phenomena in the Universe. At ultrahigh energies, beyond 10<sup>18</sup> eV, the cosmic rays are studied by the two largest observatories built so far, the Pierre Auger Observatory and the Telescope Array. Both observatories are based on a hybrid design and reported a measurement of the energy spectrum using the high duty cycle of the surface detector and the calorimetric estimation of the energy scale provided by the fluorescence detector.

    The differences among the reported spectra are scrutinized by a working group made by members of the Pierre Auger and Telescope Array Collaborations. The two measurements have been found well in agreement below 10<sup>19</sup> eV while, at higher energies, they show an energy-dependent difference that is beyond the systematic uncertainties associated to the energy scale.

    In this contribution we review the status and perspectives of the working group activities including new studies aiming at addressing the impact on the flux measurement at the highest energies of potential biases in the estimation of the shower size.

    DOI： 10.1051/epjconf/202328302003

  • Effects of Galactic magnetic field on the UHECR anisotropy studies

    Ryo Higuchi, Takashi Sako, Kazumasa Kawata, Toshihiro Fujii, Eiji Kido, R. U. Abbasi, T. Abu-Zayyad, M. Allen, Y. Arai, R. Arimura, E. Barcikowski, J. W. Belz, D. R. Bergman, S. A. Blake, I. Buckland, R. Cady, B. G. Cheon, J. Chiba, M. Chikawa, K. Fujisue, K. Fujita, R. Fujiwara, M. Fukushima, R. Fukushima, G. Furlich, R. Gonzalez, W. Hanlon, M. Hayashi, N. Hayashida, K. Hibino, R. Higuchi, K. Honda, D. Ikeda, T. Inadomi, N. Inoue, T. Ishii, H. Ito, D. Ivanov, H. Iwakura, A. Iwasaki, H. M. Jeong, S. Jeong, C. C.H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, S. Kasami, H. Kawai, S. Kawakami, S. Kawana, K. Kawata, I. Kharuk, E. Kido, H. B. Kim, J. H. Kim, J. H. Kim, M. H. Kim, S. W. Kim, Y. Kimura, S. Kishigami, Y. Kubota, S. Kurisu, V. Kuzmin, M. Kuznetsov, Y. J. Kwon, K. H. Lee, B. Lubsandorzhiev, J. P. Lundquist, K. Machida, H. Matsumiya, T. Matsuyama, J. N. Matthews, R. Mayta, M. Minamino, K. Mukai, I. Myers, S. Nagataki, K. Nakai, R. Nakamura, T. Nakamura, T. Nakamura, Y. Nakamura, A. Nakazawa, E. Nishio, T. Nonaka, H. Oda, S. Ogio, M. Ohnishi, H. Ohoka, Y. Oku, T. Okuda, Y. Omura, M. Ono, R. Onogi, A. Oshima, S. Ozawa, I. H. Park, M. Potts, M. S. Pshirkov

    Proceedings of Science   395   2022.03（ eISSN:1824-8039 ）

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    Publishing type：Research paper (international conference proceedings)  

    Telescope Array (TA) and Auger experiments reported anisotropies in the arrival direction of ultrahigh-energy cosmic rays (UHECRs). In particular, Auger Collaboration reported a correlation between UHECR events and the flux model of assumed sources and suggested a contribution of starburst galaxies (SBGs) to the anisotropy of UHECRs. However, in their study, the effect of coherent deflections by the galactic magnetic field (GMF) is not taken into account. In this study, we investigated the effect of the GMF on the arrival directions of UHECRs using the cosmic ray propagation code CRPropa3. We used a backtracking technique which consists of propagating antiparticles to map the flux outside the galaxy to at the earth. We estimate the systematic effects caused by GMF in the reported likelihood analysis. We conduct likelihood analysis for mock UHECR datasets based on the flux pattern through the GMF model. We found systematic decrease of (fani, θ) due to GMF. As prospects for the TAx4 experiment and joint analysis of Auger and TA collaborations, we develop the likelihood analysis method with the convolution of the rigidity spectrum.

  • Telescope Array search for EeV photons

    Oleg E. Kalashev, Ivan V. Kharuk, Mikhail Yu Kuznetsov, Grigory I. Rubtsov, R. U. Abbasi, T. Abu-Zayyad, M. Allen, Y. Arai, R. Arimura, E. Barcikowski, J. W. Belz, D. R. Bergman, S. A. Blake, I. Buckland, R. Cady, B. G. Cheon, J. Chiba, M. Chikawa, T. Fujii, K. Fujisue, K. Fujita, R. Fujiwara, M. Fukushima, R. Fukushima, G. Furlich, R. Gonzalez, W. Hanlon, M. Hayashi, N. Hayashida, K. Hibino, R. Higuchi, K. Honda, D. Ikeda, T. Inadomi, N. Inoue, T. Ishii, H. Ito, D. Ivanov, H. Iwakura, A. Iwasaki, H. M. Jeong, S. Jeong, C. C.H. Jui, K. Kadota, F. Kakimoto, O. Kalshev, K. Kasahara, S. Kasami, H. Kawai, S. Kawakami, S. Kawana, K. Kawata, Z. Zundel, E. Kido, H. B. Kim, J. H. Kim, J. A. Kim, M. H. Kim, S. W. Kim, Y. Kimura, S. Kishigami, Y. Kubota, S. Kurisu, V. Kuzmin, Y. Zhezher, Y. J. Kwon, K. H. Lee, B. Lubsandorzhiev, J. P. Lundquist, K. Machida, H. Matsumiya, T. Matsuyama, J. N. Matthews, R. Mayta, M. Minamino, K. Mukai, I. Myers, S. Nagataki, K. Nakai, R. Nakamura, T. Nakamura, T. Nakamora, Y. Nakamura, A. Nakazawa, E. Nishio, T. Nonaka, H. Oda, S. Ogio, M. Ohnishi, H. Ohoka, Y. Oku, T. Okuda, Y. Omura, M. Ono, R. Onogi, A. Oshima, S. Ozawa, I. H. Park, M. Potts, M. S. Pshirkov

    Proceedings of Science   395   2022.03（ eISSN:1824-8039 ）

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    Publishing type：Research paper (international conference proceedings)  

    We present updated results of the search for the ultra-high energy photons with primary energies greater than 10 EeV. The data of the Telescope Array Surface Detector collected over 11 years are used in this work. The method is based on the machine learning classifier, which is trained on both the reconstructed composition-sensitive parameters of the event and the calibrated waveform signals at each triggered station of the Surface Detector.

  • Hotspot Update, and a new Excess of Events on the Sky Seen by the Telescope Array Experiment

    Jihyun Kim, Dmitri Ivanov, Kazumasa Kawata, Hiroyuki Sagawa, Gordon Thomson, R. U. Abbasi, T. Abu-Zayyad, M. Allen, Y. Arai, R. Arimura, E. Barcikowski, J. W. Belz, D. R. Bergman, S. A. Blake, I. Buckland, R. Cady, B. G. Cheon, J. Chiba, M. Chikawa, T. Fujii, K. Fujisue, K. Fujita, R. Fujiwara, M. Fukushima, R. Fukushima, G. Furlich, R. Gonzalez, W. Hanlon, M. Hayashi, N. Hayashida, K. Hibino, R. Higuchi, K. Honda, D. Ikeda, T. Inadomi, N. Inoue, T. Ishii, H. Ito, D. Ivanov, H. Iwakura, A. Iwasaki, H. M. Jeong, S. Jeong, C. C.H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, S. Kasami, H. Kawai, S. Kawakami, S. Kawana, K. Kawata, I. Kharuk, E. Kido, H. B. Kim, J. H. Kim, M. H. Kim, S. W. Kim, Y. Kimura, S. Kishigami, Y. Kubota, S. Kurisu, V. Kuzmin, M. Kuznetsov, Y. J. Kwon, K. H. Lee, B. Lubsandorzhiev, J. P. Lundquist, K. Machida, H. Matsumiya, T. Matsuyama, J. N. Matthews, R. Mayta, M. Minamino, K. Mukai, I. Myers, S. Nagataki, K. Nakai, R. Nakamura, T. Nakamura, T. Nakamura, Y. Nakamura, A. Nakazawa, E. Nishio, T. Nonaka, H. Oda, S. Ogio, M. Ohnishi, H. Ohoka, Y. Oku, T. Okuda, Y. Omura, M. Ono, R. Onogi, A. Oshima, S. Ozawa, I. H. Park, M. Potts, M. S. Pshirkov

    Proceedings of Science   395   2022.03（ eISSN:1824-8039 ）

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    Publishing type：Research paper (international conference proceedings)  

    The Telescope Array (TA) experiment, the largest observatory studying ultrahigh energy cosmic rays in the northern hemisphere, has reported an excess in the arrival direction distribution for events with energies above 5.7 × 1019 eV, called the hotspot. We report here the latest results of the TA hotspot using the most recent data measured by the TA surface detector array, which is more than doubled exposure since the first publication; the hotspot still exists with 3 sigma post-trial significance. By using an oversampling search with a 20◦-circle, similar to the study of the hotspot, we find an additional excess of events at slightly lower energies. The Perseus-Pisces supercluster lies at the location of the new excess. Assuming this structure is responsible for the excess, we conducted a statistical analysis to verify the correlation between observed events and the members of the Perseus-Pisces supercluster.

  • Observation of variations in cosmic ray single count rates during thunderstorms and implications for large-scale electric field changes

    R. U. Abbasi, T. Abu-Zayyad, M. Allen, Y. Arai, R. Arimura, E. Barcikowski, J. W. Belz, D. R. Bergman, S. A. Blake, I. Buckland, R. Cady, B. G. Cheon, J. Chiba, M. Chikawa, T. Fujii, K. Fujisue, K. Fujita, R. Fujiwara, M. Fukushima, R. Fukushima, G. Furlich, N. Globus, R. Gonzalez, W. Hanlon, M. Hayashi, N. Hayashida, K. Hibino, R. Higuchi, K. Honda, N. Husseini, D. Ikeda, T. Inadomi, N. Inoue, T. Ishii, H. Ito, D. Ivanov, H. Iwakura, A. Iwasaki, H. M. Jeong, S. Jeong, H. Johnson, C. C.H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, S. Kasami, H. Kawai, S. Kawakami, S. Kawana, K. Kawata, I. Kharuk, E. Kido, H. B. Kim, J. H. Kim, J. H. Kim, M. H. Kim, S. W. Kim, Y. Kimura, S. Kishigami, Y. Kubota, S. Kurisu, V. Kuzmin, M. Kuznetsov, Y. J. Kwon, K. H. Lee, R. Levon, B. Lubsandorzhiev, J. P. Lundquist, K. Machida, H. Matsumiya, T. Matsuyama, J. N. Matthews, R. Mayta, J. Mazich, M. Minamino, K. Mukai, I. Myers, P. Myers, S. Nagataki, K. Nakai, R. Nakamura, T. Nakamura, T. Nakamura, Y. Nakamura, A. Nakazawa, E. Nishio, T. Nonaka, K. O'Brien, H. Oda, S. Ogio, M. Ohnishi, H. Ohoka, Y. Oku, T. Okuda, Y. Omura, M. Ono, R. Onogi, A. Oshima, S. Ozawa

    Physical Review D   105 ( 6 )   2022.03（ ISSN:2470-0010 ） （ eISSN:2470-0029 ）

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    Publishing type：Research paper (scientific journal)  

    We present the first observation by the Telescope Array Surface Detector (TASD) of the effect of thunderstorms on the development of cosmic ray single count rate intensity over a 700 km2 area. Observations of variations in the secondary low-energy cosmic ray counting rate, using the TASD, allow us to study the electric field inside thunderstorms, on a large scale, as it progresses on top of the 700 km2 detector, without dealing with the limitation of narrow exposure in time and space using balloons and aircraft detectors. In this work, variations in the cosmic ray intensity (single count rate) using the TASD, were studied and found to be on average at the ~(0.5-1)% and up to 2% level. These observations were found to be both in excess and in deficit. They were also found to be correlated with lightning in addition to thunderstorms. These variations lasted for tens of minutes; their footprint on the ground ranged from 6 km to 24 km in diameter and moved in the same direction as the thunderstorm. With the use of simple electric field models inside the cloud and between cloud to ground, the observed variations in the cosmic ray single count rate were recreated using CORSIKA simulations. Depending on the electric field model used and the direction of the electric field in that model, the electric field magnitude that reproduces the observed low-energy cosmic ray single count rate variations was found to be approximately between 0.2 GV-0.4 GV. This in turn allows us to get a reasonable insight on the electric field and its effect on cosmic ray air showers inside thunderstorms.

    DOI： 10.1103/PhysRevD.105.062002

  • Ultra-High-Energy Cosmic Rays: The Intersection of the Cosmic and Energy Frontiers

    Coleman, A., Eser, J., Mayotte, E., Sarazin, F., Schröder, F. G., Soldin, D., Venters, T. M., Aloisio, R., Alvarez-Muñiz, J., Batista, R. Alves, Bergman, D., Bertaina, M., Caccianiga, L., Deligny, O., Dembinski, H. P., Denton, P. B., di Matteo, A., Globus, N., Glombitza, J., Golup, G., Haungs, A., Hör, el, J. R., Jaffe, T. R., Kelley, J. L., Krizmanic, J. F., Lu, L., Matthews, J. N., Mariş, I., Mussa, R., Oikonomou, F., Pierog, T., Santos, E., Tinyakov, P., Tsunesada, Y., Unger, M., Yushkov, A., Albrow, M. G., Anchordoqui, L. A., Andeen, K., Arnone, E., Barghini, D., Bechtol, E., Bellido, J. A., Casolino, M., Castellina, A., Cazon, L., Conceição, R., Cremonini, R., Dujmovic, H., Engel, R., Farrar, G., Fenu, F., Ferrarese, S., Fujii, T., Gardiol, D., Gritsevich, M., Homola, P., Huege, T., Kampert, K. -H., Kang, D., Kido, E., Klimov, P., Kotera, K., Kozelov, B., Leszczyńska, A., Madsen, J., Marcelli, L., Marisaldi, M., Martineau-Huynh, O., Mayotte, S., Mulrey, K., Murase, K., Muzio, M. S., Ogio, S., Olinto, A. V., Onel, Y., Paul, T., Piotrowski, L., Plum, M., Pont, B., Reininghaus, M., Riedel, B., Riehn, F., Roth, M., Sako, T., Schlüter, F., Shoemaker, D., Sidhu, J., Sidelnik, I., Timmermans, C., Tkachenko, O., Veberič, D., Verpoest, S., Verzi, V., Vícha, J., Winn, D., Zas, E., Zotov, M.

    2022

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    Publishing type：Research paper (scientific journal)  

    The present white paper is submitted as part of the "Snowmass" process to help inform the long-term plans of the United States Department of Energy and the National Science Foundation for high-energy physics. It summarizes the science questions driving the Ultra-High-Energy Cosmic-Ray (UHECR) community and provides recommendations on the strategy to answer them in the next two decades.

    DOI： 10.48550/ARXIV.2205.05845

  • Surface detectors of the TAx4 experiment

    R. U. Abbasi, M. Abe, T. Abu-Zayyad, M. Allen, Y. Arai, E. Barcikowski, J. W. Belz, D. R. Bergman, S. A. Blake, R. Cady, B. G. Cheon, J. Chiba, M. Chikawa, T. Fujii, K. Fujisue, K. Fujita, R. Fujiwara, M. Fukushima, R. Fukushima, G. Furlich, W. Hanlon, M. Hayashi, N. Hayashida, K. Hibino, R. Higuchi, K. Honda, D. Ikeda, T. Inadomi, N. Inoue, T. Ishii, H. Ito, D. Ivanov, H. Iwakura, H. M. Jeong, S. Jeong, C. C. H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, S. Kasami, H. Kawai, S. Kawakami, S. Kawana, K. Kawata, E. Kido, H. B. Kim, J. H. Kim, J. H. Kim, M. H. Kim, S. W. Kim, Y. Kimura, S. Kishigami, Kuzmin, V, M. Kuznetsov, Y. J. Kwon, K. H. Lee, B. Lubsandorzhiev, J. P. Lundquist, K. Machida, H. Matsumiya, T. Matsuyama, J. N. Matthews, R. Mayta, M. Minamino, K. Mukai, Myers, I, S. Nagataki, K. Nakai, R. Nakamura, T. Nakamura, Y. Nakamura, T. Nonaka, H. Oda, S. Ogio, M. Ohnishi, H. Ohoka, Y. Oku, T. Okuda, Y. Omura, M. Ono, R. Onogi, A. Oshima, S. Ozawa, I. H. Park, M. S. Pshirkov, J. Remington, D. C. Rodriguez, G. Rubtsov, D. Ryu, H. Sagawa, R. Sahara, K. Saito, Y. Saito, N. Sakaki, T. Sako, N. Sakurai, K. Sano, K. Sato, T. Seki, K. Sekino, P. D. Shah, F. Shibata, N. Shibata, T. Shibata, H. Shimodaira, B. K. Shin, H. S. Shin, D. Shinto, J. D. Smith, P. Sokolsky, N. Sone, B. T. Stokes, T. A. Stroman, T. Suzawa, Y. Takagi, Y. Takahashi, M. Takamura, M. Takeda, R. Takeishi, A. Taketa, M. Takita, Y. Tameda, H. Tanaka, K. Tanaka, M. Tanaka, Y. Tanoue, S. B. Thomas, G. B. Thomson, P. Tinyakov, Tkachev, I, H. Tokuno, T. Tomida, S. Troitsky, R. Tsuda, Y. Tsunesada, Y. Uchihori, S. Udo, T. Uehama, F. Urban, T. Wong, K. Yada, M. Yamamoto, K. Yamazaki, J. Yang, K. Yashiro, F. Yoshida, Y. Zhezher, Z. Zundel

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   1019   2021.12（ ISSN:0168-9002 ） （ eISSN:1872-9576 ）

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    Publishing type：Research paper (scientific journal)  

    Telescope Array (TA) is the largest ultrahigh energy cosmic-ray (UHECR) observatory in the Northern Hemisphere. It explores the origin of UHECRs by measuring their energy spectrum, arrival-direction distribution, and mass composition using a surface detector (SD) array covering approximately 700 km(2) and fluorescence detector (FD) stations. TA has found evidence for a cluster of cosmic rays with energies greater than 57 EeV. In order to confirm this evidence with more data, it is necessary to increase the data collection rate. We have begun building an expansion of TA that we call TAx4. In this paper, we explain the motivation, design, technical features, and expected performance of the TAx4 SD. We also present TAx4's current status and examples of the data that have already been collected.

    DOI： 10.1016/j.nima.2021.165726

  • The status of the TALE surface detector array and TALE infill project

    Shoichi Ogio, Rasha Abbasi, Tareq Abu-Zayyad, Monica Allen, Yuto Arai, Ryuhei Arimura, Elliott Barcikowski, John Belz, Douglas Bergman, Samuel Blake, Robert Cady, ByongGu Cheon, Jyunsei Chiba, Michiyuki Chikawa, Toshihiro Fujii, Kozo Fujisue, Keitaro Fujita, Ryota Fujiwara, Masaki Fukushima, Ryota Fukushima, Greg Furlich, Noemie Globus, Ricardo Gonzalez, William Hanlon, Motoki Hayashi, Naoaki Hayashida, Kinya Hibino, Ryo Higuchi, Ken Honda, Daisuke Ikeda, Taichi Inadomi, Naoya Inoue, Takaaki Ishii, Hirotaka Ito, Dmitri Ivanov, Hirokazu Iwakura, Aoi Iwasaki, Hyoming Jeong, Soomin Jeong, Charlie Jui, Kenichi Kadota, Fumio Kakimoto, Oleg Kalashev, Katsuaki Kasahara, Saori Kasami, Hideyuki Kawai, Saburo Kawakami, Shingo Kawana, Katsumasa Kawata, Ivan Kharuk, Eiji Kido, HangBae Kim, Jihee Kim, Jihyun Kim, Min Hyo Kim, Sang Woo Kim, Yusuke Kimura, Shoichi Kishigami, Yuto Kubota, Shinnosuke Kurisu, Vladim Kuzmin, Mikhail Kuznetsov, Youngjoon Kwon, Kwangho Lee, BayarJon Paul Lubsandorzhiev, Jon Paul Lundquist, Kazuhiro Machida, Hiroyuki Matsumiya, Toshio Matsuyama, John Matthews, Rosa Mayta, Mayuko Minamino, Keijiro Mukai, Isaac Myers, Shigehiro Nagataki, Kei Nakai, Ryo Nakamura, Toru Nakamura, Tomoyuki Nakamura, Yuya Nakamura, Arata Nakazawa, Eiji Nishio, Toshiyuki Nonaka, Hiroyuki Oda, Munehiro Ohnishi, Hideyuki Ohoka, Yuya Oku, Takeshi Okuda, Yugo Omura, Masaomi Ono, Ryota Onogi, Akitoshi Oshima, Shunsuke OZAWA, Il Hung Park, Matt Potts, Maxim Pshirkov, Jackson Remington, Doug Rodriguez, Grigory Rubtsov, Dongsu Ryu, Hiroyuki Sagawa, Ryosuke Sahara, Yasunori Saito, Naoto Sakaki, Takashi Sako, Nobuyuki Sakurai, Kengo Sano, Koki Sato, Terutsugu Seki, Koichi Sekino, Priti Shah, Yuma Shibasaki, Fumiya Shibata, Norimichi Shibata, Tatsunobu Shibata, Hideaki Shimodaira, Bokkyun Shin, Heungsu Shin, Daiki Shinto, Jeremy Smith, Pierre Sokolsky, Naohiro Sone, Ben Stokes, Tom Stroman, Yoshinori Takagi, Yuichi Takahashi, Mai Takamura, Masahiro Takeda, Ryuji Takeishi, Akimichi Taketa, Masato Takita, Yuichiro Tameda, Hideki Tanaka, Koichi Tanaka, Manobu Tanaka, Yuta Tanoue, Stanton Thomas, Gordon Thomson, Petr Tinyakov, Igor Tkachev, Hisono Tokuno, Taka Tomida, Sergey Troitsky, Ryosuke Tsuda, Yoshiki Tsunesada, Yukio Uchihori, Shigeharu Udo, Takafumi Uehama, Federico Urban, Tiffany Wong, Kohei Yada, Mashu Yamamoto, Katsuya Yamazaki, Jongmann Yang, Kenta Yashiro, Fugo Yoshida, Tsubasa Yoshioka, Yana Zhezher, Zach Zundel

    Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)   2021.07

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    Publishing type：Research paper (international conference proceedings)  

    DOI： 10.22323/1.395.0255

  • Observations of the Origin of Downward Terrestrial Gamma‐Ray Flashes

    J. W. Belz, P. R. Krehbiel, J. Remington, M. A. Stanley, R. U. Abbasi, R. LeVon, W. Rison, D. Rodeheffer, T. Abu‐Zayyad, M. Allen, E. Barcikowski, D. R. Bergman, S. A. Blake, M. Byrne, R. Cady, B. G. Cheon, M. Chikawa, A. Matteo, T. Fujii, K. Fujita, R. Fujiwara, M. Fukushima, G. Furlich, W. Hanlon, M. Hayashi, Y. Hayashi, N. Hayashida, K. Hibino, K. Honda, D. Ikeda, T. Inadomi, N. Inoue, T. Ishii, H. Ito, D. Ivanov, H. Iwakura, H. M. Jeong, S. Jeong, C. C. H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, S. Kasami, H. Kawai, S. Kawakami, K. Kawata, E. Kido, H. B. Kim, J. H. Kim, J. H. Kim, V. Kuzmin†, M. Kuznetsov, Y. J. Kwon, K. H. Lee, B. Lubsandorzhiev, J. P. Lundquist, K. Machida, H. Matsumiya, J. N. Matthews, T. Matuyama, R. Mayta, M. Minamino, K. Mukai, I. Myers, S. Nagataki, K. Nakai, R. Nakamura, T. Nakamura, Y. Nakamura, T. Nonaka, H. Oda, S. Ogio, M. Ohnishi, H. Ohoka, Y. Oku, T. Okuda, Y. Omura, M. Ono, A. Oshima, S. Ozawa, I. H. Park, M. Potts, M. S. Pshirkov, D. C. Rodriguez, G. Rubtsov, D. Ryu, H. Sagawa, R. Sahara, K. Saito, Y. Saito, N. Sakaki, T. Sako, N. Sakurai, K. Sano, T. Seki, K. Sekino, F. Shibata, T. Shibata, H. Shimodaira, B. K. Shin, H. S. Shin, J. D. Smith, P. Sokolsky, N. Sone, B. T. Stokes, T. A. Stroman, Y. Takagi, Y. Takahashi, M. Takeda, R. Takeishi, A. Taketa, M. Takita, Y. Tameda, K. Tanaka, M. Tanaka, Y. Tanoue, S. B. Thomas, G. B. Thomson, P. Tinyakov, I. Tkachev, H. Tokuno, T. Tomida, S. Troitsky, Y. Tsunesada, Y. Uchihori, S. Udo, T. Uehama, F. Urban, M. Wallace, T. Wong, M. Yamamoto, H. Yamaoka, K. Yamazaki, K. Yashiro, M. Yosei, H. Yoshii, Y. Zhezher, Z. Zundel

    Journal of Geophysical Research: Atmospheres   125 ( 23 )   2020.12（ ISSN:2169-897X ） （ eISSN:2169-8996 ）

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    Abstract

    In this paper we report the first close, high‐resolution observations of downward‐directed terrestrial gamma‐ray flashes (TGFs) detected by the large‐area Telescope Array cosmic ray observatory, obtained in conjunction with broadband VHF interferometer and fast electric field change measurements of the parent discharge. The results show that the TGFs occur during strong initial breakdown pulses (IBPs) in the first few milliseconds of negative cloud‐to‐ground and low‐altitude intracloud flashes and that the IBPs are produced by a newly identified streamer‐based discharge process called fast negative breakdown. The observations indicate the relativistic runaway electron avalanches (RREAs) responsible for producing the TGFs are initiated by embedded spark‐like transient conducting events (TCEs) within the fast streamer system and potentially also by individual fast streamers themselves. The TCEs are inferred to be the cause of impulsive sub‐pulses that are characteristic features of classic IBP sferics. Additional development of the avalanches would be facilitated by the enhanced electric field ahead of the advancing front of the fast negative breakdown. In addition to showing the nature of IBPs and their enigmatic sub‐pulses, the observations also provide a possible explanation for the unsolved question of how the streamer to leader transition occurs during the initial negative breakdown, namely, as a result of strong currents flowing in the final stage of successive IBPs, extending backward through both the IBP itself and the negative streamer breakdown preceding the IBP.

    DOI： 10.1029/2019jd031940

    Other URL： https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2019JD031940

  • Measurement of the proton-air cross section with Telescope Array’s Black Rock Mesa and Long Ridge fluorescence detectors, and surface array in hybrid mode

    R. U. Abbasi, M. Abe, T. Abu-Zayyad, M. Allen, R. Azuma, E. Barcikowski, J. W. Belz, D. R. Bergman, S. A. Blake, R. Cady, B. G. Cheon, J. Chiba, M. Chikawa, A. di Matteo, T. Fujii, K. Fujisue, K. Fujita, R. Fujiwara, M. Fukushima, G. Furlich, W. Hanlon, M. Hayashi, N. Hayashida, K. Hibino, R. Higuchi, K. Honda, D. Ikeda, T. Inadomi, N. Inoue, T. Ishii, R. Ishimori, H. Ito, D. Ivanov, H. Iwakura, H. M. Jeong, S. Jeong, C. C. H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, S. Kasami, H. Kawai, S. Kawakami, S. Kawana, K. Kawata, E. Kido, H. B. Kim, J. H. Kim, J. H. Kim, M. H. Kim, S. W. Kim, S. Kishigami, V. Kuzmin, M. Kuznetsov, Y. J. Kwon, K. H. Lee, B. Lubsandorzhiev, J. P. Lundquist, K. Machida, H. Matsumiya, T. Matsuyama, J. N. Matthews, R. Mayta, M. Minamino, K. Mukai, I. Myers, S. Nagataki, K. Nakai, R. Nakamura, T. Nakamura, Y. Nakamura, Y. Nakamura, T. Nonaka, H. Oda, S. Ogio, M. Ohnishi, H. Ohoka, Y. Oku, T. Okuda, Y. Omura, M. Ono, R. Onogi, A. Oshima, S. Ozawa, I. H. Park, M. S. Pshirkov, J. Remington, D. C. Rodriguez, G. Rubtsov, D. Ryu, H. Sagawa, R. Sahara, Y. Saito, N. Sakaki, T. Sako, N. Sakurai, K. Sano, T. Seki, K. Sekino, P. D. Shah, F. Shibata, T. Shibata, H. Shimodaira, B. K. Shin, H. S. Shin, J. D. Smith, P. Sokolsky, N. Sone, B. T. Stokes, T. A. Stroman, T. Suzawa, Y. Takagi, Y. Takahashi, M. Takamura, M. Takeda, R. Takeishi, A. Taketa, M. Takita, Y. Tameda, H. Tanaka, K. Tanaka, M. Tanaka, Y. Tanoue, S. B. Thomas, G. B. Thomson, P. Tinyakov, I. Tkachev, H. Tokuno, T. Tomida, S. Troitsky, Y. Tsunesada, Y. Uchihori, S. Udo, T. Uehama, F. Urban, T. Wong, K. Yada, M. Yamamoto, K. Yamazaki, J. Yang, K. Yashiro, M. Yosei, Y. Zhezher, Z. Zundel

    Physical Review D   102 ( 6 )   2020.09（ ISSN:2470-0010 ） （ eISSN:2470-0029 ）

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/physrevd.102.062004

    Other URL： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.102.062004/fulltext

  • Evidence for a Supergalactic Structure of Magnetic Deflection Multiplets of Ultra-high-energy Cosmic Rays

    R. U. Abbasi, M. Abe, T. Abu-Zayyad, M. Allen, R. Azuma, E. Barcikowski, J. W. Belz, D. R. Bergman, S. A. Blake, R. Cady, B. G. Cheon, J. Chiba, M. Chikawa, A. di Matteo, T. Fujii, K. Fujisue, K. Fujita, R. Fujiwara, M. Fukushima, G. Furlich, W. Hanlon, M. Hayashi, N. Hayashida, K. Hibino, R. Higuchi, K. Honda, D. Ikeda, T. Inadomi, N. Inoue, T. Ishii, R. Ishimori, H. Ito, D. Ivanov, H. Iwakura, H. M. Jeong, S. Jeong, C. C. H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, S. Kasami, H. Kawai, S. Kawakami, S. Kawana, K. Kawata, E. Kido, H. B. Kim, J. H. Kim, J. H. Kim, M. H. Kim, S. W. Kim, S. Kishigami, V. Kuzmin, M. Kuznetsov, Y. J. Kwon, K. H. Lee, B. Lubsandorzhiev, J. P. Lundquist, K. Machida, H. Matsumiya, T. Matsuyama, J. N. Matthews, R. Mayta, M. Minamino, K. Mukai, I. Myers, S. Nagataki, K. Nakai, R. Nakamura, T. Nakamura, Y. Nakamura, T. Nonaka, H. Oda, S. Ogio, M. Ohnishi, H. Ohoka, Y. Oku, T. Okuda, Y. Omura, M. Ono, R. Onogi, A. Oshima, S. Ozawa, I. H. Park, M. S. Pshirkov, J. Remington, D. C. Rodriguez, G. Rubtsov, D. Ryu, H. Sagawa, R. Sahara, Y. Saito, N. Sakaki, T. Sako, N. Sakurai, K. Sano, T. Seki, K. Sekino, P. D. Shah, F. Shibata, T. Shibata, H. Shimodaira, B. K. Shin, H. S. Shin, J. D. Smith, P. Sokolsky, N. Sone, B. T. Stokes, T. A. Stroman, T. Suzawa, Y. Takagi, Y. Takahashi, M. Takamura, R. Takeishi, A. Taketa, M. Takita, Y. Tameda, H. Tanaka, K. Tanaka, M. Tanaka, Y. Tanoue, S. B. Thomas, G. B. Thomson, P. Tinyakov, I. Tkachev, H. Tokuno, T. Tomida, S. Troitsky, Y. Tsunesada, Y. Uchihori, S. Udo, T. Uehama, F. Urban, T. Wong, K. Yada, M. Yamamoto, K. Yamazaki, J. Yang, K. Yashiro, M. Yosei, Y. Zhezher, Z. Zundel

    The Astrophysical Journal   899 ( 1 )   86 - 86   2020.08（ eISSN:1538-4357 ）

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.3847/1538-4357/aba26c

    Other URL： https://iopscience.iop.org/article/10.3847/1538-4357/aba26c

  • Search for Ultra-High-Energy Neutrinos with the Telescope Array Surface Detector

    R. U. Abbasi, M. Abe, T. Abu-Zayyad, M. Allen, R. Azuma, E. Barcikowski, J. W. Belz, D. R. Bergman, S. A. Blake, R. Cady, B. G. Cheon, J. Chiba, M. Chikawa, A. di Matteo, T. Fujii, K. Fujita, R. Fujiwara, M. Fukushima, G. Furlich, W. Hanlon, M. Hayashi, Y. Hayashi, N. Hayashida, K. Hibino, K. Honda, D. Ikeda, N. Inoue, T. Ishii, R. Ishimori, H. Ito, D. Ivanov, H. M. Jeong, S. Jeong, C. C. H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, H. Kawai, S. Kawakami, S. Kawana, K. Kawata, E. Kido, H. B. Kim, J. H. Kim, J. H. Kim, S. Kishigami, S. Kitamura, Y. Kitamura, V. Kuzmin, M. Kuznetsov, Y. J. Kwon, K. H. Lee, B. Lubsandorzhiev, J. P. Lundquist, K. Machida, K. Martens, T. Matsuyama, J. N. Matthews, R. Mayta, M. Minamino, K. Mukai, I. Myers, K. Nagasawa, S. Nagataki, K. Nakai, R. Nakamura, T. Nakamura, T. Nonaka, H. Oda, S. Ogio, J. Ogura, M. Ohnishi, H. Ohoka, T. Okuda, Y. Omura, M. Ono, R. Onogi, A. Oshima, S. Ozawa, I. H. Park, M. S. Pshirkov, J. Remington, D. C. Rodriguez, G. Rubtsov, D. Ryu, H. Sagawa, R. Sahara, K. Saito, Y. Saito, N. Sakaki, T. Sako, N. Sakurai, L. M. Scott, T. Seki, K. Sekino, P. D. Shah, F. Shibata, T. Shibata, H. Shimodaira, B. K. Shin, H. S. Shin, J. D. Smith, P. Sokolsky, B. T. Stokes, S. R. Stratton, T. A. Stroman, T. Suzawa, Y. Takagi, Y. Takahashi, M. Takamura, M. Takeda, R. Takeishi, A. Taketa, M. Takita, Y. Tameda, H. Tanaka, K. Tanaka, M. Tanaka, Y. Tanoue, S. B. Thomas, G. B. Thomson, P. Tinyakov, I. Tkachev, H. Tokuno, T. Tomida, S. Troitsky, Y. Tsunesada, K. Tsutsumi, Y. Uchihori, S. Udo, F. Urban, T. Wong, K. Yada, M. Yamamoto, H. Yamaoka, K. Yamazaki, J. Yang, K. Yashiro, H. Yoshii, Y. Zhezher, Z. Zundel

    Journal of Experimental and Theoretical Physics   131 ( 2 )   255 - 264   2020.08（ ISSN:1063-7761 ） （ eISSN:1090-6509 ）

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1134/s106377612005012x

    Other URL： http://link.springer.com/article/10.1134/S106377612005012X/fulltext.html

  • Search for Large-scale Anisotropy on Arrival Directions of Ultra-high-energy Cosmic Rays Observed with the Telescope Array Experiment

    R. U. Abbasi, M. Abe, T. Abu-Zayyad, M. Allen, R. Azuma, E. Barcikowski, J. W. Belz, D. R. Bergman, S. A. Blake, R. Cady, B. G. Cheon, J. Chiba, M. Chikawa, A. di Matteo, T. Fujii, K. Fujisue, K. Fujita, R. Fujiwara, M. Fukushima, G. Furlich, W. Hanlon, M. Hayashi, N. Hayashida, K. Hibino, R. Higuchi, K. Honda, D. Ikeda, T. Inadomi, N. Inoue, T. Ishii, R. Ishimori, H. Ito, D. Ivanov, H. Iwakura, H. M. Jeong, S. Jeong, C. C. H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, S. Kasami, H. Kawai, S. Kawakami, S. Kawana, K. Kawata, E. Kido, H. B. Kim, J. H. Kim, J. H. Kim, M. H. Kim, S. W. Kim, S. Kishigami, V. Kuzmin, M. Kuznetsov, Y. J. Kwon, K. H. Lee, B. Lubsandorzhiev, J. P. Lundquist, K. Machida, H. Matsumiya, T. Matsuyama, J. N. Matthews, R. Mayta, M. Minamino, K. Mukai, I. Myers, S. Nagataki, K. Nakai, R. Nakamura, T. Nakamura, Y. Nakamura, Y. Nakamura, T. Nonaka, H. Oda, S. Ogio, M. Ohnishi, H. Ohoka, Y. Oku, T. Okuda, Y. Omura, M. Ono, R. Onogi, A. Oshima, S. Ozawa, I. H. Park, M. S. Pshirkov, J. Remington, D. C. Rodriguez, G. Rubtsov, D. Ryu, H. Sagawa, R. Sahara, Y. Saito, N. Sakaki, T. Sako, N. Sakurai, K. Sano, T. Seki, K. Sekino, P. D. Shah, F. Shibata, T. Shibata, H. Shimodaira, B. K. Shin, H. S. Shin, J. D. Smith, P. Sokolsky, N. Sone, B. T. Stokes, T. A. Stroman, T. Suzawa, Y. Takagi, Y. Takahashi, M. Takamura, M. Takeda, R. Takeishi, A. Taketa, M. Takita, Y. Tameda, H. Tanaka, K. Tanaka, M. Tanaka, Y. Tanoue, S. B. Thomas, G. B. Thomson, P. Tinyakov, I. Tkachev, H. Tokuno, T. Tomida, S. Troitsky, Y. Tsunesada, Y. Uchihori, S. Udo, T. Uehama, F. Urban, T. Wong, K. Yada, M. Yamamoto, K. Yamazaki, J. Yang, K. Yashiro, M. Yosei, Y. Zhezher, Z. Zundel

    The Astrophysical Journal   898 ( 2 )   L28 - L28   2020.07（ eISSN:2041-8213 ）

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.3847/2041-8213/aba0bc

    Other URL： https://iopscience.iop.org/article/10.3847/2041-8213/aba0bc

  • Search for point sources of ultra-high-energy photons with the Telescope Array surface detector

    R U Abbasi, M Abe, T Abu-Zayyad, M Allen, R Azuma, E Barcikowski, J W Belz, D R Bergman, S A Blake, R Cady, B G Cheon, J Chiba, M Chikawa, A di Matteo, T Fujii, K Fujita, R Fujiwara, M Fukushima, G Furlich, W Hanlon, M Hayashi, Y Hayashi, N Hayashida, K Hibino, K Honda, D Ikeda, N Inoue, T Ishii, R Ishimori, H Ito, D Ivanov, H M Jeong, S Jeong, C C H Jui, K Kadota, F Kakimoto, O Kalashev, K Kasahara, H Kawai, S Kawakami, S Kawana, K Kawata, E Kido, H B Kim, J H Kim, J H Kim, S Kishigami, V Kuzmin, M Kuznetsov, Y J Kwon, K H Lee, B Lubsandorzhiev, J P Lundquist, K Machida, K Martens, T Matsuyama, J N Matthews, R Mayta, M Minamino, K Mukai, I Myers, S Nagataki, K Nakai, R Nakamura, T Nakamura, T Nonaka, H Oda, S Ogio, M Ohnishi, H Ohoka, T Okuda, Y Omura, M Ono, R Onogi, A Oshima, S Ozawa, I H Park, M S Pshirkov, J Remington, D C Rodriguez, G Rubtsov, D Ryu, H Sagawa, R Sahara, K Saito, Y Saito, N Sakaki, T Sako, N Sakurai, L M Scott, T Seki, K Sekino, P D Shah, F Shibata, T Shibata, H Shimodaira, B K Shin, H S Shin, J D Smith, P Sokolsky, B T Stokes, S R Stratton, T A Stroman, T Suzawa, Y Takagi, Y Takahashi, M Takamura, M Takeda, R Takeishi, A Taketa, M Takita, Y Tameda, H Tanaka, K Tanaka, M Tanaka, Y Tanoue, S B Thomas, G B Thomson, P Tinyakov, I Tkachev, H Tokuno, T Tomida, S Troitsky, Y Tsunesada, K Tsutsumi, Y Uchihori, S Udo, F Urban, T Wong, K Yada, M Yamamoto, H Yamaoka, K Yamazaki, J Yang, K Yashiro, H Yoshii, Y Zhezher, Z Zundel

    Monthly Notices of the Royal Astronomical Society   492 ( 3 )   3984 - 3993   2020.03（ ISSN:0035-8711 ） （ eISSN:1365-2966 ）

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    <title>ABSTRACT</title>
    The surface detector (SD) of the Telescope Array (TA) experiment allows us to detect indirectly photons with energies of the order of 1018 eV and higher, and to separate photons from the cosmic ray background. In this paper, we present the results of a blind search for point sources of ultra-high-energy (UHE) photons in the Northern sky using the TA SD data. The photon-induced extensive air showers are separated from the hadron-induced extensive air shower background by means of a multivariate classifier based upon 16 parameters that characterize the air shower events. No significant evidence for the photon point sources is found. The upper limits are set on the flux of photons from each particular direction in the sky within the TA field of view, according to the experiment’s angular resolution for photons. The average 95 per cent confidence level upper-limits for the point-source flux of photons with energies greater than 1018, 1018.5, 1019, 1019.5 and 1020 eV are 0.094, 0.029, 0.010, 0.0073 and 0.0058 km−2yr−1, respectively. For energies higher than 1018.5 eV, the photon point-source limits are set for the first time. Numerical results for each given direction in each energy range are provided as a supplement to this paper.

    DOI： 10.1093/mnras/stz3618

  • ПОИСК НЕЙТРИНО УЛЬТРАВЫСОКИХ ЭНЕРГИЙ ПО ДАННЫМ НАЗЕМНОЙ РЕШЕТКИ ЭКСПЕРИМЕНТА TELESCOPE ARRAY

    R. U. ABBASI, M. ABE, T. ABU-ZAYYAD, M. ALLEN, R. AZUMA, E. BARCIKOWSKI, J. W. BELZ, D. R. BERGMAN, S. A. BLAKE, R. CADY, B. G. CHEON, J. CHIBA, M. CHIKAWA, A. DI MATTEO, T. FUJII, K. FUJITA, R. FUJIWARA, M. FUKUSHIMA, G. FURLICH, W. HANLON, M. HAYASHI, Y. HAYASHI, N. HAYASHIDA, K. HIBINO, K. HONDA, D. IKEDA, N. INOUE, T. ISHII, R. ISHIMORI, H. ITO, D. IVANOV, H. M. JEONG, S. JEONG, C. C. H. JUI, K. KADOTA, F. KAKIMOTO, O. KALASHEV, K. KASAHARA, H. KAWAI, S. KAWAKAMI, S. KAWANA, K. KAWATA, E. KIDO, H. B. KIM, JI HEE KIM, JIHYUN KIM, S. KISHIGAMI, S. KITAMURA, Y. KITAMURA, V. KUZMIN, M. KUZNETSOV, Y. J. KWON, K. H. LEE, B. LUBSANDORZHIEV, J. P. LUNDQUIST, K. MACHIDA, K. MARTENS, T. MATSUYAMA, J. N. MATTHEWS, R. MAYTA, M. MINAMINO, K. MUKAI, I. MYERS, K. NAGASAWA, S. NAGATAKI, K. NAKAI, R. NAKAMURA, T. NAKAMURA, T. NONAKA, H. ODA, S. OGIO, J. OGURA, M. OHNISHI, H. OHOKA, T. OKUDA, Y. OMURA, M. ONO, R. ONOGI, A. OSHIMA, S. OZAWA, I. H. PARK, M. S. PSHIRKOV, J. REMINGTON, D. C. RODRIGUEZ, G. RUBTSOV, D. RYU, H. SAGAWA, R. SAHARA, K. SAITO, Y. SAITO, N. SAKAKI, T. SAKO, N. SAKURAI, L. M. SCOTT, T. SEKI, K. SEKINO, P. D. SHAH, F. SHIBATA, T. SHIBATA, H. SHIMODAIRA, B. K. SHIN, H. S. SHIN, J. D. SMITH, P. SOKOLSKY, B. T. STOKES, S. R. STRATTON, T. A. STROMAN, T. SUZAWA, Y. TAKAGI, Y. TAKAHASHI, M. TAKAMURA, M. TAKEDA, R. TAKEISHI, A. TAKETA, M. TAKITA, Y. TAMEDA, H. TANAKA, K. TANAKA, M. TANAKA, Y. TANOUE, S. B. THOMAS, G. B. THOMSON, P. TINYAKOV, I. TKACHEV, H. TOKUNO, T. TOMIDA, S. TROITSKY, Y. TSUNESADA, K. TSUTSUMI, Y. UCHIHORI, S. UDO, F. URBAN, T. WONG, K. YADA, M. YAMAMOTO, H. YAMAOKA, K. YAMAZAKI, J. YANG, K. YASHIRO, H. YOSHII, Y. ZHEZHER, Z. ZUNDEL

    ЖУРНАЛ ЭКСПЕРИМЕНТАЛЬНОЙ И ТЕОРЕТИЧЕСКОЙ ФИЗИКИ   158 ( 2(8) )   282 - 294   2020（ ISSN:0044-4510 ）

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.31857/s0044451020080052

  • Ultra-violet imaging of the night-time earth by EUSO-Balloon towards space-based ultra-high energy cosmic ray observations Reviewed

    G. Abdellaoui, S. Abe, J. H. Adams, A. Ahriche, D. Allard, L. Allen, G. Alonso, L. Anchordoqui, A. Anzalone, Y. Arai, K. Asano, R. Attallah, H. Attoui, M. Ave Pernas, S. Bacholle, M. Bakiri, P. Baragatti, P. Barrillon, S. Bartocci, J. Bayer, B. Beldjilali, T. Belenguer, N. Belkhalfa, R. Bellotti, A. Belov, K. Belov, K. Benmessai, M. Bertaina, P. L. Biermann, S. Biktemerova, F. Bisconti, N. Blanc, J. Błȩcki, S. Blin-Bondil, P. Bobik, M. Bogomilov, E. Bozzo, S. Briz, A. Bruno, K. S. Caballero, F. Cafagna, D. Campana, J. N. Capdevielle, F. Capel, A. Caramete, L. Caramete, P. Carlson, R. Caruso, M. Casolino, C. Cassardo, A. Castellina, C. Catalano, O. Catalano, A. Cellino, M. Chikawa, G. Chiritoi, M. J. Christl, V. Connaughton, L. Conti, G. Cordero, G. Cotto, H. J. Crawford, R. Cremonini, S. Csorna, A. Cummings, S. Dagoret-Campagne, A. J. de Castro, C. De Donato, C. de la Taille, C. De Santis, L. del Peral, M. Di Martino, A. Diaz Damian, T. Djemil, I. Dutan, A. Ebersoldt, T. Ebisuzaki, R. Engel, J. Eser, F. Fenu, S. Fernández-González, S. Ferrarese, M. Flamini, C. Fornaro, M. Fouka, A. Franceschi, S. Franchini, C. Fuglesang, T. Fujii, J. Fujimoto, M. Fukushima, P. Galeotti, E. García-Ortega, G. Garipov, E. Gascón, J. Genci, G. Giraudo, C. González Alvarado, P. Gorodetzky, R. Greg

    Astroparticle Physics   111   54 - 71   2019.09（ ISSN:0927-6505 ）

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    © 2018 The JEM-EUSO (Joint Experiment Missions for the Extreme Universe Space Observatory) program aims at developing Ultra-Violet (UV) fluorescence telescopes for efficient detections of Extensive Air Showers (EASs) induced by Ultra-High Energy Cosmic Rays (UHECRs) from satellite orbit. In order to demonstrate key technologies for JEM-EUSO, we constructed the EUSO-Balloon instrument that consists of a ∼1 m 2 refractive telescope with two Fresnel lenses and an array of multi-anode photo-multiplier tubes at the focus. Distinguishing it from the former balloon-borne experiments, EUSO-Balloon has the capabilities of single photon counting with a gate time of 2.3 µs and of imaging with a total of 2304 pixels. As a pathfinder mission, the instrument was launched for an 8 h stratospheric flight on a moonless night in August 2014 over Timmins, Canada. In this work, we analyze the count rates over ∼2.5 h intervals. The measurements are of diffuse light, e.g. of airglow emission, back-scattered from the Earth's atmosphere as well as artificial light sources. Count rates from such diffuse light are a background for EAS detections in future missions and relevant factor for the analysis of EAS events. We also obtain the geographical distribution of the count rates over a ∼780 km 2 area along the balloon trajectory. In developed areas, light sources such as the airport, mines, and factories are clearly identified. This demonstrates the correct location of signals that will be required for the EAS analysis in future missions. Although a precise determination of count rates is relevant for the existing instruments, the absolute intensity of diffuse light is deduced for the limited conditions by assuming spectra models and considering simulations of the instrument response. Based on the study of diffuse light by EUSO-Balloon, we also discuss the implications for coming pathfinders and future space-based UHECR observation missions.

    DOI： 10.1016/j.astropartphys.2018.10.008

  • The Auger@TA Project: Phase II Progress and Plans

    Corbin Covault, Toshihiro Fujii, Robert Halliday, Jeffrey Johnsen, Ryan Lorek, Toshiyuki Nonaka, Sean Quinn, Hiroyuki Sagawa, Takashi Sako, Fred Sarazin, Ricardo Satos, David Schmidt, Ryuji Takeishi

    ULTRA HIGH ENERGY COSMIC RAYS 2018 (UHECR 2018)   210   2019（ ISSN:2100-014X ）

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    Publishing type：Research paper (international conference proceedings)  

    The Auger@TA project is a combined effort involving members of both the Pierre Auger Observatory and the Telescope Array experiment (TA) to cross-calibrate detectors and compare results on air showers detected at one location. We have recently reported results from Phase I of the project, during which we collected and presented data from two Auger water Cherenkov surface detector stations deployed into the TA experiment near the Central Laser Facility. For Phase II, we will deploy a micro-array of six or seven single-PMT Auger surface detector stations co-located with TA scintillator surface detector stations. The Auger micro-array will trigger and collect data independently from the TA allowing for a complete end-to-end comparison of detector data, calibration, and reconstructed event quantities on a shower-by-shower basis between the TA and Auger detector systems. We describe progress towards development of the micro-array for Phase II including the preparation of surface detector water tanks, station electronics, wireless communications, triggers, and data acquisition. We also outline plans for deploying the Auger@TA micro-array into the TA experiment in 2019 with preliminary estimates for coincident air-shower rates.

    DOI： 10.1051/epjconf/201921005004

  • TA Anisotropy Summary

    K. Kawata, A. di Matteo, T. Fujii, D. Ivanov, C.C.H. Jui, J.P. Lundquist, J.N. Matthews, S. Ogio, H. Sagawa, G.B. Thomson, P. Tinyakov, I. Tkachev, S. Troitsky

    EPJ Web of Conferences   210   01004 - 01004   2019（ eISSN:2100-014X ）

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    The Telescope Array (TA) is the largest ultra-high-energy cosmic-ray (UHECR) detector in the northern hemisphere. It consists of an array of 507 surface detectors (SD) covering a total 700 km<sup>2</sup> and three fluorescence detector stations overlooking the SD array. In this proceedings, we summarize recent results on the search for directional anisotropy of UHECRs using the latest dataset collected by the TA SD array. We obtained hints of the anisotropy of the UHECRs in the northern sky from the various analyses.

    DOI： 10.1051/epjconf/201921001004

  • Overview of the Auger@TA project and preliminary results from Phase I

    Fred Sarazin, Corbin Covault, Toshihiro Fujii, Robert Halliday, Jeffrey Johnsen, Ryan Lorek, Toshiyuki Nonaka, Sean Quinn, Hiroyuki Sagawa, Takashi Sako, Ricardo Sato, David Schmidt, Ryuji Takeishi

    ULTRA HIGH ENERGY COSMIC RAYS 2018 (UHECR 2018)   210   2019（ ISSN:2100-014X ）

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    Publishing type：Research paper (international conference proceedings)  

    We report on the first results of a unique in-situ experimental cross-calibration effort of the surface detector of the Pierre Auger Observatory and of the Telescope Array experiment (Auger@TA). In the first phase of Auger@TA, we performed surface detector station-to-station comparisons for a collection of extensive air showers landing near the experimental setup and detected by Telescope Array. Beyond the deduced cross-calibration curve between the Water-Cherenkov-based Auger and Scintillator-based TA Surface Detector stations, we also investigate the consistency of their response for individual reconstructed showers. The dataset is currently too small to draw firm conclusions as-of-yet. Hence, phase I data taking will continue even as we gear up for the deployment of an Auger micro-array within Telescope Array as part of Phase II of this work.

    DOI： 10.1051/epjconf/201921005002

  • Mass composition of ultrahigh-energy cosmic rays with the Telescope Array Surface Detector data Reviewed

    Abbasi, R.U., Abe, M., Abu-Zayyad, T., Allen, M., Azuma, R., Barcikowski, E., Belz, J.W., Bergman, D.R., Blake, S.A., Cady, R., Cheon, B.G., Chiba, J., Chikawa, M., Di Matteo, A., Fujii, T., Fujita, K., Fukushima, M., Furlich, G., Goto, T., Hanlon, W., Hayashi, M., Hayashi, Y., Hayashida, N., Hibino, K., Honda, K., Ikeda, D., Inoue, N., Ishii, T., Ishimori, R., Ito, H., Ivanov, D., Jeong, H.M., Jeong, S., Jui, C.C.H., Kadota, K., Kakimoto, F., Kalashev, O., Kasahara, K., Kawai, H., Kawakami, S., Kawana, S., Kawata, K., Kido, E., Kim, H.B., Kim, J.H., Kim, J.H., Kishigami, S., Kitamura, S., Kitamura, Y., Kuzmin, V., Kuznetsov, M., Kwon, Y.J., Lee, K.H., Lubsandorzhiev, B., Lundquist, J.P., Machida, K., Martens, K., Matsuyama, T., Matthews, J.N., Mayta, R., Minamino, M., Mukai, K., Myers, I., Nagasawa, K., Nagataki, S., Nakamura, R., Nakamura, T., Nonaka, T., Oda, H., Ogio, S., Ogura, J., Ohnishi, M., Ohoka, H., Okuda, T., Omura, Y., Ono, M., Onogi, R., Oshima, A., Ozawa, S., Park, I.H., Piskunov, M.S., Pshirkov, M.S., Remington, J., Rodriguez, D.C., Rubtsov, G., Ryu, D., Sagawa, H., Sahara, R., Saito, K., Saito, Y., Sakaki, N., Sakurai, N., Scott, L.M., Seki, T., Sekino, K., Shah, P.D., Shibata, F., Shibata, T., Shimodaira, H., Shin, B.K., Shin, H.S., Smith, J.D., Sokolsky, P., Stokes, B.T., Stratton, S.R., Stroman, T.A., Suzawa, T., Takagi, Y., Takahashi, Y., Takamura, M., Takeda, M., Takeishi, R., Taketa, A., Takita, M., Tameda, Y., Tanaka, H., Tanaka, K., Tanaka, M., Thomas, S.B., Thomson, G.B., Tinyakov, P., Tkachev, I., Tokuno, H., Tomida, T., Troitsky, S., Tsunesada, Y., Tsutsumi, K., Uchihori, Y., Udo, S., Urban, F., Wong, T., Yada, K., Yamamoto, M., Yamane, R., Yamaoka, H., Yamazaki, K., Yang, J., Yashiro, K., Yoneda, Y., Yoshida, S., Yoshii, H., Zhezher, Y., Zundel, Z.

    Physical Review D   99 ( 2 )   2019

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    DOI： 10.1103/PhysRevD.99.022002

  • Constraints on the diffuse photon flux with energies above 10 <sup>18</sup> eV using the surface detector of the Telescope Array experiment Reviewed

    Abbasi, R.U., Abe, M., Abu-Zayyad, T., Allen, M., Azuma, R., Barcikowski, E., Belz, J.W., Bergman, D.R., Blake, S.A., Cady, R., Cheon, B.G., Chiba, J., Chikawa, M., di Matteo, A., Fujii, T., Fujita, K., Fukushima, M., Furlich, G., Goto, T., Hanlon, W., Hayashi, M., Hayashi, Y., Hayashida, N., Hibino, K., Honda, K., Ikeda, D., Inoue, N., Ishii, T., Ishimori, R., Ito, H., Ivanov, D., Jeong, H.M., Jeong, S., Jui, C.C.H., Kadota, K., Kakimoto, F., Kalashev, O., Kasahara, K., Kawai, H., Kawakami, S., Kawana, S., Kawata, K., Kido, E., Kim, H.B., Kim, J.H., Kishigami, S., Kitamura, S., Kitamura, Y., Kuzmin, V., Kuznetsov, M., Kwon, Y.J., Lee, K.H., Lubsandorzhiev, B., Lundquist, J.P., Machida, K., Martens, K., Matsuyama, T., Matthews, J.N., Mayta, R., Minamino, M., Mukai, K., Myers, I., Nagasawa, K., Nagataki, S., Nakamura, R., Nakamura, T., Nonaka, T., Oda, H., Ogio, S., Ogura, J., Ohnishi, M., Ohoka, H., Okuda, T., Omura, Y., Ono, M., Onogi, R., Oshima, A., Ozawa, S., Park, I.H., Piskunov, M.S., Pshirkov, M.S., Remington, J., Rodriguez, D.C., Rubtsov, G.I., Ryu, D., Sagawa, H., Sahara, R., Saito, K., Saito, Y., Sakaki, N., Sakurai, N., Scott, L.M., Seki, T., Sekino, K., Shah, P.D., Shibata, F., Shibata, T., Shimodaira, H., Shin, B.K., Shin, H.S., Smith, J.D., Sokolsky, P., Stokes, B.T., Stratton, S.R., Stroman, T.A., Suzawa, T., Takagi, Y., Takahashi, Y., Takamura, M., Takeda, M., Takeishi, R., Taketa, A., Takita, M., Tameda, Y., Tanaka, H., Tanaka, K., Tanaka, M., Thomas, S.B., Thomson, G.B., Tinyakov, P., Tkachev, I., Tokuno, H., Tomida, T., Troitsky, S., Tsunesada, Y., Tsutsumi, K., Uchihori, Y., Udo, S., Urban, F., Wong, T., Yamamoto, M., Yamane, R., Yamaoka, H., Yamazaki, K., Yang, J., Yashiro, K., Yoneda, Y., Yoshida, S., Yoshii, H., Zhezher, Y., Zundel, Z.

    Astroparticle Physics   110   2019

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.astropartphys.2019.03.003

  • Updated results on the UHECR hotspot observed by the telescope array experiment

    K. Kawata, A. di Matteo, T. Fujii, D. Ikeda, D. Ivanov, C. C.H. Jui, E. Kido, J. P. Lundquist, J. N. Matthews, S. Nagataki, T. Nonaka, S. Ogio, T. Okuda, G. Rubtsov, H. Sagawa, T. Sako, N. Sakurai, M. Takeda, R. Takeishi, A. Taketa, G. B. Thomson, P. Tinyakov, I. Tkachev, S. Troitsky

    Proceedings of Science   358   2019（ eISSN:1824-8039 ）

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    Publishing type：Research paper (international conference proceedings)  

    The Telescope Array Experiment has observed an indication of intermediate-scale anisotropy in the UHECR arrival directions, called the Hotspot, with E > 57 EeV around the Ursa Major using the first 5-year data during a period between May 2008 and May 2013 collected by the TA surface detector array. The chance probability of this hotspot in an isotropic cosmic-ray sky was calculated to be 3.4s (post trial). In this paper, we will report on an update of this result using the 11-year data collected by the TA surface detectors with more than doubled exposure since the first publication.

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MISC

  • FAST experiment: 10 : Observing Ultra-high energy cosmic rays in both hemispheres by using new fluorescence telescopes

    YOO S., 藤井俊博, 窪秀利, 野崎誠也, 岡知彦, 寺内健太, 武多昭道, MALACARI M., ALBURY J., BELLIDO J.A., CHYTKA L., FARMER J., HAMAL P., HORVATH P., HRABOVSKY M., KVITA J., MANDAT D., MASTRODICASA M., MATTHEWS J.N., MICHAL S., NI X., NOZKA L., PALATKA M., PECH M., PRIVITERA P., SCHOVANEK P., SALAMIDA F., SMIDA R., THOMAS S.B., TRAVNICEK P., VACULA M.

    日本物理学会講演概要集(CD-ROM)   75 ( 2 )   2020（ ISSN:2189-079X ）

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  • 新型大気蛍光望遠鏡による極高エネルギー宇宙線の観測状況及び波形収集回路の開発

    寺内健太, 藤井俊博, 窪秀利, 野崎誠也, 岡知彦, YOO Seokhyun, 武多昭道, SMIDA Radomir, PRIVITERA Paolo, NI Xiaochen, MALACARI Max, FARMER John, ALBURY Justin, BELLIDO Jose A., TRAVNICEK Petr, SCHOVANEK Petr, PECH Miroslav, NOZKA Libor, PALATKA Miroslav, MICHAL Stanislav, MANDAT Dusan, CHYTKA Ladislav, HAMAL Petr, VACULA Martin, HORVATH Pavel, HRABOVSKY Miroslav, KVITA Jiri, SALAMIDA Francesco, MASTRODICASA Massimo, MATTHEWS John N., THOMAS Stan B.

    日本天文学会年会講演予稿集   2020   2020（ ISSN:1347-0639 ）

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Grant-in-Aid for Scientific Research

  • 新型大気蛍光望遠鏡による極高エネルギー宇宙線観測実験の相互較正

    Grant-in-Aid for Scientific Research(A)  2025

  • Ultra-precise Observation of Cosmic Ray Air Shower Particles Using Subaru Telescope

    Grant-in-Aid for Challenging Research (Exploratory)  2025

  • Ultra-precise Observation of Cosmic Ray Air Shower Particles Using Subaru Telescope

    Grant-in-Aid for Challenging Research (Exploratory)  2024

  • Multimesseger Study of Heavy Dark Matter

    Grant-in-Aid for Transformative Research Areas (A)  2024

  • Hunting solar axions with new pixel-type silicon detector under extremely low background environment

    Grant-in-Aid for Challenging Research (Pioneering)  2024

  • Pioneering ultrahigh-energy cosmic ray astronomy using new air-fluorescence telescope array

    Grant-in-Aid for Scientific Research(A)  2024

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Charge of on-campus class subject

  • 物理実験学A

    2024   Weekly class   Undergraduate

  • 専門物理学実験A

    2024   Weekly class   Undergraduate

  • 物理学特別研究2A

    2024   Intensive lecture   Graduate school

  • 物理学特別研究1A

    2024   Intensive lecture   Graduate school

  • 物理学特別演習2A

    2024   Intensive lecture   Graduate school

  • 物理学特別演習1A

    2024   Intensive lecture   Graduate school

  • 物理学特別研究5A

    2024   Intensive lecture   Graduate school

  • 物理学特別研究4A

    2024   Intensive lecture   Graduate school

  • 物理学特別研究3A

    2024   Intensive lecture   Graduate school

  • 物理学特別演習5A

    2024   Intensive lecture   Graduate school

  • 物理学特別演習4A

    2024   Intensive lecture   Graduate school

  • 物理学特別演習3A

    2024   Intensive lecture   Graduate school

  • 専門物理学実験B

    2024   Weekly class   Undergraduate

  • 海外特別研究1

    2024   Intensive lecture   Graduate school

  • 物理学特別研究2B

    2024   Intensive lecture   Graduate school

  • 物理学特別研究1B

    2024   Intensive lecture   Graduate school

  • 物理学特別演習2B

    2024   Intensive lecture   Graduate school

  • 物理学特別演習1B

    2024   Intensive lecture   Graduate school

  • 海外特別研究5

    2024   Intensive lecture   Graduate school

  • 海外特別研究5

    2024   Intensive lecture   Graduate school

  • 物理学特別研究5B

    2024   Intensive lecture   Graduate school

  • 物理学特別研究4B

    2024   Intensive lecture   Graduate school

  • 物理学特別研究3B

    2024   Intensive lecture   Graduate school

  • 物理学特別演習5B

    2024   Intensive lecture   Graduate school

  • 物理学特別演習4B

    2024   Intensive lecture   Graduate school

  • 物理学特別演習3B

    2024   Intensive lecture   Graduate school

  • 海外特別研究

    2024   Intensive lecture   Undergraduate

  • 物理学講読

    2024   Weekly class   Undergraduate

  • 特別実験・特別理論演習

    2024   Intensive lecture   Undergraduate

  • 専門物理学実験

    2024   Weekly class   Undergraduate

  • 物理実験学

    2024   Weekly class   Undergraduate

▼display all