Author: "Oleg Kalashev" - Searchworks@Jio Institute Digital Library Search Results

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85 results on '"Oleg Kalashev"'

1. Upper Limit on the Diffuse Radio Background from GZK Photon Observation

Author: Graciela B. Gelmini, Oleg Kalashev, and Dmitri Semikoz
Subjects: GZK photons, UHECR, diffuse radio background, Elementary particle physics, QC793-793.5
Abstract: Here, we point out that an observation of ultrahigh energy cosmic ray (UHECR) photons, “GZK photons”, could provide an upper limit on the level of the extragalactic radio background, depending on the level of UHECR proton primaries (to be determined after a few years of data taking by the Pierre Auger Observatory upgrade AugerPrime). We also update our 2005 prediction of the range of GZK photon fluxes expected from proton primaries.
Published: 2022
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2. Hunting Super-heavy Dark Matter with Ultra-high Energy Photons

Author: Luis A Anchordoqui, Corinne Berat, Mario E Bertaina, Antonella Castellina, Olivier Deligny, Ralph Engel, Glennys R Farrar, Piera L Ghia, Dan Hooper, Oleg Kalashev, Mikhail Kuznetsov, Marcus Niechciol, Angela V Olinto, Philipp Papenbreer, Lorenzo Perrone, Julian Rautenberg, Andrés Romero-Wolf, Pierpaolo Savina, Jorge F Soriano, and Tonia M Venters
Subjects: Astrophysics
Abstract: At any epoch, particle physics must be open to completely unexpected discoveries, and that is reason enoughto extend the reach of searches for ultra-high energy (UHE) photons. The observation of a population ofphotons with energies𝐸 ≳100 EeVwould for example imply the existence of either a completely new physicalphenomena, or particle acceleration mechanisms heretofore never seen or imagined. But as we outline in thisLetter of Interest, there are also good arguments for super-heavy dark matter (SHDM) in a parameter rangesuch that it could be discovered via its decays to, in particular, UHE photons. Only ultra-high energy cosmic rayobservatories have capabilities to detect UHE photons. We first investigate how current and future observationscan probe and constrain SHDM models in important directions, and then outline some of the scenarios thatmotivate such searches. We also discuss connections between constraints on SHDM and on the parametervalues of cosmological models
Published: 2021
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3. Identifying nearby sources of ultra-high-energy cosmic rays with deep learning.

Author: Oleg Kalashev, Maxim Pshirkov, and Mikhail Zotov
Published: 2019

4. Analysing arrival directions of ultra-high-energy cosmic rays with convolutional neural networks

Author: Oleg Kalashev, Maxim Pshirkov, and Mikhail Zotov
Subjects: History, Computer Science Applications, Education
Abstract: The problem of identification of ultra-high-energy cosmic ray (UHECR) sources is greatly complicated by the fact that even the highest energy cosmic rays may be deflected by tens of degrees in the galactic magnetic fields. We show that arrival directions of UHECRs from several nearest active galaxies form specific patterns in the sky, which can be effectively recognized by convolutional neural networks. We use one of the recently developed convnet implementations for images defined on the sphere to train the classifier that is able to detect patterns that can be present in the experimental data. We calculate the minimal detectable from-source event fractions for several realistic source candidates and discuss the method limitations.
Published: 2023
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5. Study on the cosmic ray intensity variation using scintillation counters for air shower observation

Author: Ryuji Takeishi, Daiki Shinto, Priti Shah, Michiyuki Chikawa, Ryo Nakamura, Shingo Kawana, Rasha Abbasi, Masahiro Takeda, Ken Honda, Takashi Sako, M. Ohnishi, Taichi Inadomi, Kinya Hibino, William Hanlon, Sergey Troitsky, Fumiya Shibata, Saori Kasami, G. Furlich, Takaaki Ishii, Aoi Iwasaki, Taka Tomida, Jyunsei Chiba, Dongsu Ryu, Fugo Yoshida, J. Remington, Ben Stokes, Min Hyo Kim, Koki Sato, Zach Zundel, Matt Potts, Kenta Yashiro, Hirokazu Iwakura, Kengo Sano, Federico R. Urban, Nobuyuki Sakurai, Y. Takagi, D. C. Rodriguez, HangBae Kim, Vladim Kuzmin, Hideki Tanaka, Shinnosuke Kurisu, Keitaro Fujita, Shigeharu Udo, Hisono Tokuno, Hideaki Shimodaira, Hyoming Jeong, Takeshi Okuda, Igor Tkachev, Naohiro Sone, Naoaki Hayashida, Tatsunobu Shibata, H. Oda, Ivan Kharuk, Ryuhei Arimura, S. Kawakami, Stanton Thomas, Akitoshi Oshima, Ryota Fujiwara, Toshiyuki Nonaka, Ryo Higuchi, Shunsuke Ozawa, Yuta Tanoue, Ricardo Gonzalez, Yoshiki Tsunesada, Daisuke Ikeda, Naoto Sakaki, Katsuaki Kasahara, Pierre Sokolsky, Yuya Oku, Arata Nakazawa, Katsumasa Kawata, Charlie Jui, Motoki Hayashi, Shigehiro Nagataki, Oleg Kalashev, Tiffany Wong, Samuel Blake, Hirotaka Ito, Shoichi Ogio, Yana Zhezher, Hiroyuki Sagawa, Kei Nakai, BayarJon Paul Lubsandorzhiev, Sang Woo Kim, Masaki Fukushima, Fumio Kakimoto, M. Yamamoto, Yuichiro Tameda, Heungsu Shin, Mayuko Minamino, K. Yamazaki, Kozo Fujisue, Jeremy Smith, Tareq Abu-Zayyad, John Matthews, Tsubasa Yoshioka, Koichi Tanaka, J. Yang, Tomoyuki Nakamura, Yukio Uchihori, Toru Nakamura, Koichi Sekino, Jon Paul Lundquist, Kenichi Kadota, Youngjoon Kwon, John Belz, Akimichi Taketa, Eiji Nishio, P. Tinyakov, Il Hung Park, Masato Takita, Ryota Fukushima, Ryota Onogi, J. H. Kim, Mikhail Kuznetsov, Maxim Pshirkov, Y. Takahashi, Mai Takamura, Yuto Arai, Isaac Myers, Hideyuki Kawai, Yuma Shibasaki, R. Mayta, Douglas Bergman, Grigory Rubtsov, Ryosuke Tsuda, Soomin Jeong, R. Sahara, T. Seki, Naoya Inoue, Yasunori Saito, Hiroyuki Matsumiya, Takafumi Uehama, Eiji Kido, Kazuhiro Machida, Telescope Array, Shoichi Kishigami, Masaomi Ono, Norimichi Shibata, Y. Omura, Monica Allen, Bokkyun Shin, ByongGu Cheon, Elliott Barcikowski, Dmitri Ivanov, Keijiro Mukai, Hideyuki Ohoka, Yusuke Kimura, Toshio Matsuyama, Manobu Tanaka, K. H. Lee, Jihee Kim, Gordon Thomson, Tom Stroman, Robert Cady, Toshihiro Fujii, Yuto Kubota, Y. Nakamura, and Kohei Yada
Subjects: Physics, Air shower, Scintillation counter, Cosmic ray, Astrophysics, Variation (astronomy), Intensity (heat transfer)
Published: 2021
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6. Anisotropy search in the Ultra High Energy Cosmic Ray Spectrum in the Northern Hemisphere using latest data obtained with Telescope Array surface detector

Author: Grigory Rubtsov, John Matthews, Norimichi Shibata, Y. Omura, J. Yang, Fumiya Shibata, Shingo Kawana, M. Ohnishi, Taichi Inadomi, Matt Potts, William Hanlon, Monica Allen, Bokkyun Shin, Fugo Yoshida, Yuma Shibasaki, ByongGu Cheon, Ben Stokes, Douglas Bergman, Jyunsei Chiba, Dongsu Ryu, Toshihiro Fujii, Koki Sato, Yasunori Saito, M. Yamamoto, Hirokazu Iwakura, Y. Takagi, Ryuhei Arimura, Hideyuki Ohoka, Yuto Kubota, Federico R. Urban, Nobuyuki Sakurai, Kengo Sano, Mikhail Kuznetsov, Heungsu Shin, Ivan Kharuk, Yukio Uchihori, Keitaro Fujita, K. H. Lee, Jihee Kim, Yoshiki Tsunesada, Daisuke Ikeda, Hirotaka Ito, Sergey Troitsky, Yuto Arai, Ryota Onogi, J. H. Kim, Maxim Pshirkov, Takeshi Okuda, Y. Nakamura, Kohei Yada, Charlie Jui, BayarJon Paul Lubsandorzhiev, Mayuko Minamino, Hiroyuki Matsumiya, Igor Tkachev, R. Mayta, Hideki Tanaka, Naohiro Sone, Ryosuke Tsuda, Tiffany Wong, Taka Tomida, J. Remington, Masaki Fukushima, Takafumi Uehama, Aoi Iwasaki, Daiki Shinto, Hideaki Shimodaira, Hyoming Jeong, Shoichi Kishigami, Soomin Jeong, Shigeharu Udo, Eiji Kido, Hiroyuki Sagawa, Takashi Sako, Ryo Higuchi, Hisono Tokuno, H. Oda, Gordon Thomson, Tom Stroman, Priti Shah, Ryo Nakamura, Robert Cady, Kazuhiro Machida, Masahiro Takeda, Pierre Sokolsky, Naoaki Hayashida, Ken Honda, Tatsunobu Shibata, T. Seki, G. Furlich, Takaaki Ishii, R. Sahara, Fumio Kakimoto, Naoya Inoue, Akitoshi Oshima, Vladim Kuzmin, Ryuji Takeishi, Ryota Fukushima, Shigehiro Nagataki, Shunsuke Ozawa, K. Yamazaki, Masaomi Ono, Elliott Barcikowski, Toshiyuki Nonaka, Saori Kasami, Tareq Abu-Zayyad, Zach Zundel, Yana Zhezher, Kenta Yashiro, Dmitri Ivanov, D. C. Rodriguez, Ricardo Gonzalez, Samuel Blake, Sang Woo Kim, Kinya Hibino, Shoichi Ogio, Keijiro Mukai, HangBae Kim, Yusuke Kimura, Rasha Abbasi, Koichi Tanaka, Yuya Oku, Michiyuki Chikawa, Jon Paul Lundquist, Katsuaki Kasahara, Stanton Thomas, Katsumasa Kawata, Oleg Kalashev, Yuichiro Tameda, Tomoyuki Nakamura, Tsubasa Yoshioka, Arata Nakazawa, Masato Takita, Toru Nakamura, Telescope Array, Min Hyo Kim, Toshio Matsuyama, Kei Nakai, Ryota Fujiwara, Kenichi Kadota, Manobu Tanaka, Il Hung Park, Naoto Sakaki, S. Kawakami, Akimichi Taketa, Eiji Nishio, Hideyuki Kawai, Shinnosuke Kurisu, Jeremy Smith, Isaac Myers, Youngjoon Kwon, John Belz, Koichi Sekino, P. Tinyakov, Y. Takahashi, Mai Takamura, Yuta Tanoue, Motoki Hayashi, and Kozo Fujisue
Subjects: Surface (mathematics), Telescope, Physics, law, Detector, Northern Hemisphere, Astrophysics, Ultra-high-energy cosmic ray, Anisotropy, law.invention
Published: 2021
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7. The measurements of the cosmic ray energy spectrum and the depth of maximum shower development of Telescope Array Hybrid trigger events

Author: Katsuaki Kasahara, Shinnosuke Kurisu, Katsumasa Kawata, Shingo Kawana, William Hanlon, Tsubasa Yoshioka, R. Sahara, Hideaki Shimodaira, Hyoming Jeong, Ryo Higuchi, Norimichi Shibata, Monica Allen, Bokkyun Shin, Jeremy Smith, Y. Omura, Vladim Kuzmin, G. Furlich, Takaaki Ishii, Akimichi Taketa, Toshio Matsuyama, Eiji Nishio, ByongGu Cheon, K. Yamazaki, Tareq Abu-Zayyad, Toshiyuki Nonaka, Hideyuki Ohoka, D. C. Rodriguez, Fumiya Shibata, Hiroyuki Matsumiya, Fugo Yoshida, HangBae Kim, Hiroyuki Sagawa, Ricardo Gonzalez, Pierre Sokolsky, Tatsunobu Shibata, Hideyuki Kawai, Takafumi Uehama, Manobu Tanaka, Rasha Abbasi, Takeshi Okuda, Youngjoon Kwon, John Belz, Yuma Shibasaki, Shigehiro Nagataki, Matt Potts, Yana Zhezher, Mikhail Kuznetsov, Akitoshi Oshima, Igor Tkachev, Sang Woo Kim, Eiji Kido, Koichi Tanaka, K. H. Lee, Jihee Kim, Kazuhiro Machida, Isaac Myers, Naohiro Sone, Shunsuke Ozawa, Hideki Tanaka, Heungsu Shin, Douglas Bergman, Gordon Thomson, Ryo Nakamura, Jon Paul Lundquist, Tom Stroman, Robert Cady, Yuta Tanoue, Ben Stokes, H. Oda, Grigory Rubtsov, Tomoyuki Nakamura, Yasunori Saito, Yuto Arai, Motoki Hayashi, Ryota Fujiwara, Federico R. Urban, Nobuyuki Sakurai, Ryosuke Tsuda, Hirotaka Ito, Hisono Tokuno, Elliott Barcikowski, Charlie Jui, Soomin Jeong, Naoto Sakaki, Kozo Fujisue, BayarJon Paul Lubsandorzhiev, Mayuko Minamino, Yuya Oku, Oleg Kalashev, Dmitri Ivanov, Fumio Kakimoto, Arata Nakazawa, Kenta Yashiro, Kei Nakai, T. Seki, Naoya Inoue, Keijiro Mukai, Min Hyo Kim, Yusuke Kimura, S. Kawakami, Stanton Thomas, M. Ohnishi, Taichi Inadomi, Koki Sato, Sergey Troitsky, Kengo Sano, Aoi Iwasaki, Toshihiro Fujii, Michiyuki Chikawa, Toru Nakamura, Taka Tomida, J. Remington, Kenichi Kadota, Yuto Kubota, Il Hung Park, Saori Kasami, Y. Nakamura, Kohei Yada, Koichi Sekino, Naoaki Hayashida, P. Tinyakov, Ryuji Takeishi, Ryuhei Arimura, Yoshiki Tsunesada, Daisuke Ikeda, Tiffany Wong, Masaki Fukushima, Takashi Sako, Zach Zundel, John Matthews, J. Yang, Daiki Shinto, Priti Shah, Jyunsei Chiba, Dongsu Ryu, Masahiro Takeda, Ken Honda, Hirokazu Iwakura, Y. Takagi, Shigeharu Udo, Keitaro Fujita, Ryota Fukushima, Ivan Kharuk, M. Yamamoto, Yukio Uchihori, Ryota Onogi, J. H. Kim, R. Mayta, Kinya Hibino, Yuichiro Tameda, Masato Takita, Shoichi Kishigami, Y. Takahashi, Mai Takamura, Masaomi Ono, Telescope Array, Samuel Blake, Shoichi Ogio, and Maxim Pshirkov
Subjects: Telescope, Physics, Shower, law, Energy spectrum, Astronomy, Cosmic ray, law.invention
Published: 2021
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8. Cosmic ray energy spectrum in the 2nd knee region measured by the TALE-SD array

Author: Taka Tomida, J. Remington, G. Furlich, Takaaki Ishii, D. C. Rodriguez, Stanton Thomas, Hideki Tanaka, HangBae Kim, Fumiya Shibata, Naoaki Hayashida, Hiroyuki Matsumiya, ByongGu Cheon, Fugo Yoshida, Michiyuki Chikawa, Pierre Sokolsky, Shigehiro Nagataki, Yana Zhezher, Isaac Myers, Maxim Pshirkov, Sang Woo Kim, Matt Potts, Telescope Array, Hisono Tokuno, Ryuhei Arimura, Vladim Kuzmin, Daiki Shinto, Toru Nakamura, Takafumi Uehama, Koichi Sekino, Tomoyuki Nakamura, Takeshi Okuda, P. Tinyakov, Heungsu Shin, R. Sahara, Aoi Iwasaki, Yoshiki Tsunesada, Kenichi Kadota, Priti Shah, Daisuke Ikeda, Igor Tkachev, Il Hung Park, Toshiyuki Nonaka, Hideyuki Ohoka, Shoichi Kishigami, Rasha Abbasi, Masahiro Takeda, Naohiro Sone, Arata Nakazawa, Y. Takahashi, Mai Takamura, Ricardo Gonzalez, Tiffany Wong, Eiji Kido, Kei Nakai, Ben Stokes, Kazuhiro Machida, Masaki Fukushima, Ken Honda, H. Oda, Katsuaki Kasahara, Masaomi Ono, Yuto Arai, Toshihiro Fujii, Jyunsei Chiba, Katsumasa Kawata, Takashi Sako, Charlie Jui, Yuta Tanoue, Dongsu Ryu, Federico R. Urban, Nobuyuki Sakurai, Motoki Hayashi, BayarJon Paul Lubsandorzhiev, Mayuko Minamino, Kenta Yashiro, Yuto Kubota, Saori Kasami, Kozo Fujisue, Tsubasa Yoshioka, John Matthews, Hirokazu Iwakura, Shingo Kawana, Y. Takagi, Ryosuke Tsuda, Soomin Jeong, Yasunori Saito, Zach Zundel, J. Yang, William Hanlon, Fumio Kakimoto, Grigory Rubtsov, Ryuji Takeishi, Tatsunobu Shibata, Samuel Blake, Shoichi Ogio, T. Seki, Akitoshi Oshima, Yuya Oku, M. Ohnishi, Ryota Fujiwara, Taichi Inadomi, Y. Nakamura, Oleg Kalashev, Kohei Yada, Keitaro Fujita, Shunsuke Ozawa, Koki Sato, Yuichiro Tameda, Monica Allen, Bokkyun Shin, Naoto Sakaki, Naoya Inoue, Kengo Sano, Ryota Fukushima, Hirotaka Ito, Youngjoon Kwon, Ivan Kharuk, Masato Takita, John Belz, Norimichi Shibata, Y. Omura, Elliott Barcikowski, Dmitri Ivanov, Keijiro Mukai, Yusuke Kimura, Hideaki Shimodaira, Hyoming Jeong, Kinya Hibino, Ryo Higuchi, Toshio Matsuyama, K. Yamazaki, Tareq Abu-Zayyad, Manobu Tanaka, K. H. Lee, Jihee Kim, Gordon Thomson, Tom Stroman, Akimichi Taketa, Robert Cady, Mikhail Kuznetsov, Eiji Nishio, M. Yamamoto, Yukio Uchihori, Ryota Onogi, J. H. Kim, R. Mayta, Shigeharu Udo, Hideyuki Kawai, Shinnosuke Kurisu, Ryo Nakamura, Jeremy Smith, Yuma Shibasaki, Min Hyo Kim, Douglas Bergman, S. Kawakami, Hiroyuki Sagawa, Koichi Tanaka, Jon Paul Lundquist, and Sergey Troitsky
Subjects: Physics, Energy spectrum, Cosmic ray, Knee region, Astrophysics
Published: 2021
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9. Cosmic Ray Composition between 2 PeV and 2 EeV measured by the TALE Fluorescence Detector

Author: Shigeharu Udo, Daiki Shinto, Fumiya Shibata, Priti Shah, Stanton Thomas, Norimichi Shibata, Y. Omura, Matt Potts, Masahiro Takeda, Ken Honda, Ryo Nakamura, Youngjoon Kwon, Vladim Kuzmin, John Belz, Telescope Array, Yasunori Saito, Shinnosuke Kurisu, Yuta Tanoue, Motoki Hayashi, Tatsunobu Shibata, ByongGu Cheon, Saori Kasami, M. Yamamoto, Takeshi Okuda, Igor Tkachev, Naohiro Sone, Fumio Kakimoto, John N. Matthews, K. H. Lee, Jihee Kim, Tomoyuki Nakamura, Yukio Uchihori, J. P. Lundquist, Akitoshi Oshima, Hideyuki Ohoka, Michiyuki Chikawa, Toru Nakamura, Fugo Yoshida, Ryota Onogi, J. H. Kim, Keitaro Fujita, Kozo Fujisue, Hideki Tanaka, Shunsuke Ozawa, Jeremy Smith, Kenichi Kadota, Il Hung Park, H. Oda, Takashi Sako, Charlie Jui, Hiroyuki Matsumiya, R. Mayta, Shoichi Kishigami, Akimichi Taketa, Gordon Thomson, Hisono Tokuno, BayarJon Paul Lubsandorzhiev, Mayuko Minamino, Takafumi Uehama, Ryota Fujiwara, Eiji Nishio, Sergey Troitsky, Kinya Hibino, Min Hyo Kim, Masaomi Ono, Maxim Pshirkov, Tom Stroman, Robert Cady, Pierre Sokolsky, Taka Tomida, Shingo Kawana, Eiji Kido, Kazuhiro Machida, J. Remington, Naoto Sakaki, Katsuaki Kasahara, Shigehiro Nagataki, Yana Zhezher, M. Ohnishi, Taichi Inadomi, Yuto Kubota, Zach Zundel, Ben Stokes, William Hanlon, Sang Woo Kim, Koki Sato, Federico R. Urban, Nobuyuki Sakurai, Hideyuki Kawai, Yuma Shibasaki, Ryuhei Arimura, Katsumasa Kawata, J. Yang, Koichi Sekino, Monica Allen, Bokkyun Shin, Naoaki Hayashida, Kengo Sano, P. Tinyakov, Yoshiki Tsunesada, Daisuke Ikeda, Y. Nakamura, Douglas Bergman, Kohei Yada, S. Kawakami, Kenta Yashiro, Y. Takahashi, Mai Takamura, Tiffany Wong, Heungsu Shin, Tsubasa Yoshioka, Masaki Fukushima, Yuya Oku, Oleg Kalashev, Hiroyuki Sagawa, Samuel Blake, Shoichi Ogio, Toshiyuki Nonaka, Ricardo Gonzalez, Yuichiro Tameda, Yuto Arai, Koichi Tanaka, Rasha Abbasi, T. Fujii, Masato Takita, Toshio Matsuyama, Elliott Barcikowski, Dmitri Ivanov, Keijiro Mukai, Manobu Tanaka, Yusuke Kimura, Ryosuke Tsuda, Soomin Jeong, T. Seki, Naoya Inoue, Arata Nakazawa, Kei Nakai, G. Furlich, Takaaki Ishii, D. C. Rodriguez, HangBae Kim, Isaac Myers, Hideaki Shimodaira, Hyoming Jeong, Ryo Higuchi, K. Yamazaki, Tareq Abu-Zayyad, Mikhail Kuznetsov, Grigory Rubtsov, Hirotaka Ito, Aoi Iwasaki, Ivan Kharuk, Ryuji Takeishi, R. Sahara, Ryota Fukushima, Jyunsei Chiba, Dongsu Ryu, Hirokazu Iwakura, and Y. Takagi
Subjects: Physics, Cosmic ray, Astrophysics, Fluorescence spectroscopy
Published: 2021
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10. The status of the TALE surface detector array and TALE infill project

Author: Takashi Sako, Zach Zundel, Shigeharu Udo, Kenta Yashiro, Toru Nakamura, Kenichi Kadota, Il Hung Park, Min Hyo Kim, Ryo Nakamura, Tatsunobu Shibata, R. Sahara, Noemie Globus, Elliott Barcikowski, S. Kawakami, Akitoshi Oshima, Dmitri Ivanov, Grigory Rubtsov, Fugo Yoshida, Shunsuke Ozawa, Keijiro Mukai, Charlie Jui, BayarJon Paul Lubsandorzhiev, Yusuke Kimura, Fumio Kakimoto, Mayuko Minamino, Saori Kasami, G. Furlich, Takaaki Ishii, Norimichi Shibata, Fumiya Shibata, Hiroyuki Sagawa, Y. Omura, D. C. Rodriguez, Matt Potts, Aoi Iwasaki, HangBae Kim, Koichi Tanaka, Jon Paul Lundquist, Ryota Fukushima, Monica Allen, Bokkyun Shin, Yuya Oku, Ryuji Takeishi, Vladim Kuzmin, Oleg Kalashev, Telescope Array, M. Yamamoto, Youngjoon Kwon, Arata Nakazawa, John Belz, Kei Nakai, Yukio Uchihori, Stanton Thomas, Yasunori Saito, Maxim Pshirkov, Michiyuki Chikawa, Ben Stokes, Ryota Onogi, J. H. Kim, Hirotaka Ito, R. Mayta, Ryuhei Arimura, Shoichi Kishigami, Pierre Sokolsky, Federico R. Urban, Nobuyuki Sakurai, Hideki Tanaka, Kinya Hibino, Yoshiki Tsunesada, Shigehiro Nagataki, Yana Zhezher, Masaomi Ono, Sang Woo Kim, Sergey Troitsky, Hisono Tokuno, Taka Tomida, J. Remington, Rasha Abbasi, M. Ohnishi, Taichi Inadomi, Naoaki Hayashida, Hideaki Shimodaira, Hyoming Jeong, Isaac Myers, Koki Sato, Ryo Higuchi, Toshihiro Fujii, Tomoyuki Nakamura, Hiroyuki Matsumiya, Ryota Fujiwara, Takafumi Uehama, ByongGu Cheon, Yuto Kubota, Eiji Kido, Naoto Sakaki, Kazuhiro Machida, Kengo Sano, Katsuaki Kasahara, K. Yamazaki, Katsumasa Kawata, Tareq Abu-Zayyad, Tsubasa Yoshioka, Takeshi Okuda, Igor Tkachev, Y. Nakamura, Kohei Yada, Naohiro Sone, Mikhail Kuznetsov, Hideyuki Ohoka, H. Oda, Akimichi Taketa, Eiji Nishio, Ivan Kharuk, Hideyuki Kawai, Yuma Shibasaki, Jyunsei Chiba, Dongsu Ryu, Hirokazu Iwakura, Y. Takagi, Douglas Bergman, Shinnosuke Kurisu, Jeremy Smith, Toshio Matsuyama, K. H. Lee, Jihee Kim, Gordon Thomson, Tom Stroman, Robert Cady, Manobu Tanaka, Keitaro Fujita, Daiki Shinto, Priti Shah, Masahiro Takeda, Ken Honda, John Matthews, J. Yang, Koichi Sekino, P. Tinyakov, Y. Takahashi, Mai Takamura, Daisuke Ikeda, Tiffany Wong, Masaki Fukushima, Yuta Tanoue, Motoki Hayashi, Heungsu Shin, Kozo Fujisue, Yuto Arai, Ryosuke Tsuda, Soomin Jeong, Shingo Kawana, William Hanlon, T. Seki, Toshiyuki Nonaka, Ricardo Gonzalez, Naoya Inoue, Yuichiro Tameda, Masato Takita, Samuel Blake, and Shoichi Ogio
Subjects: Surface (mathematics), Optics, business.industry, Infill, Detector array, business, Geology
Published: 2021
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11. Current status and prospects of surface detector of the TAx4 experiment

Author: Katsumasa Kawata, Grigory Rubtsov, Tsubasa Yoshioka, Tatsunobu Shibata, Yuichiro Tameda, Kenta Yashiro, Akitoshi Oshima, Fugo Yoshida, Jyunsei Chiba, Ryosuke Tsuda, Soomin Jeong, M. Yamamoto, Ryo Nakamura, Shunsuke Ozawa, Dongsu Ryu, Takashi Sako, Shingo Kawana, Hirokazu Iwakura, Y. Takagi, ByongGu Cheon, T. Seki, Naoya Inoue, Yukio Uchihori, Hideaki Shimodaira, Hyoming Jeong, Hideki Tanaka, Aoi Iwasaki, John Matthews, Ryota Onogi, J. H. Kim, William Hanlon, Ryo Higuchi, Fumiya Shibata, J. Yang, Hisono Tokuno, Masato Takita, Akimichi Taketa, M. Ohnishi, Taichi Inadomi, Hideyuki Ohoka, Ryota Fujiwara, Youngjoon Kwon, John Belz, R. Mayta, Yuta Tanoue, Koki Sato, Eiji Nishio, Motoki Hayashi, Naoto Sakaki, Ryota Fukushima, Matt Potts, Ivan Kharuk, K. Yamazaki, Ben Stokes, Sergey Troitsky, Min Hyo Kim, Tareq Abu-Zayyad, Kengo Sano, Kozo Fujisue, Zach Zundel, Kinya Hibino, Saori Kasami, Toru Nakamura, R. Sahara, Taka Tomida, J. Remington, Federico R. Urban, Nobuyuki Sakurai, Takeshi Okuda, Igor Tkachev, Naohiro Sone, Samuel Blake, Shoichi Ogio, Kenichi Kadota, Il Hung Park, Hideyuki Kawai, Rasha Abbasi, Keitaro Fujita, Koichi Sekino, H. Oda, Mikhail Kuznetsov, Heungsu Shin, Shinnosuke Kurisu, Toshiyuki Nonaka, Ricardo Gonzalez, P. Tinyakov, S. Kawakami, Charlie Jui, Fumio Kakimoto, Yuto Arai, Naoaki Hayashida, Shigeharu Udo, Yuya Oku, Michiyuki Chikawa, Oleg Kalashev, BayarJon Paul Lubsandorzhiev, Mayuko Minamino, Y. Takahashi, Mai Takamura, Jeremy Smith, Ryuhei Arimura, Daiki Shinto, Monica Allen, Bokkyun Shin, Yuma Shibasaki, Priti Shah, Hiroyuki Sagawa, Masahiro Takeda, Vladim Kuzmin, Yoshiki Tsunesada, Daisuke Ikeda, Ken Honda, Toshio Matsuyama, Douglas Bergman, Tiffany Wong, Koichi Tanaka, Masaki Fukushima, Jon Paul Lundquist, Elliott Barcikowski, Dmitri Ivanov, Keijiro Mukai, Yusuke Kimura, Manobu Tanaka, K. H. Lee, Jihee Kim, Maxim Pshirkov, Gordon Thomson, Toshihiro Fujii, Tom Stroman, Robert Cady, Yuto Kubota, Y. Nakamura, Kohei Yada, Pierre Sokolsky, Shigehiro Nagataki, Shoichi Kishigami, Yana Zhezher, Sang Woo Kim, Masaomi Ono, Telescope Array, Tomoyuki Nakamura, Stanton Thomas, Hiroyuki Matsumiya, Takafumi Uehama, Eiji Kido, Kazuhiro Machida, Yasunori Saito, Isaac Myers, Norimichi Shibata, Y. Omura, G. Furlich, Takaaki Ishii, D. C. Rodriguez, HangBae Kim, Arata Nakazawa, Kei Nakai, Hirotaka Ito, Ryuji Takeishi, and Katsuaki Kasahara
Subjects: Physics, Surface (mathematics), Optics, business.industry, Detector, Current (fluid), business
Published: 2021
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12. Cosmic Ray Composition in the Second Knee Region as Measured by the TALE Hybrid Detector

Author: ByongGu Cheon, Hiroyuki Matsumiya, Charlie Jui, BayarJon Paul Lubsandorzhiev, Mayuko Minamino, Takashi Sako, Ivan Kharuk, Takeshi Okuda, Igor Tkachev, Takafumi Uehama, Hideyuki Ohoka, Daiki Shinto, Priti Shah, Isaac Myers, K. H. Lee, Jihee Kim, Telescope Array, Naohiro Sone, Eiji Kido, Fugo Yoshida, Kazuhiro Machida, Aoi Iwasaki, Hideaki Shimodaira, Hyoming Jeong, Masahiro Takeda, Ken Honda, H. Oda, Zach Zundel, Yuta Tanoue, Fumiya Shibata, Gordon Thomson, Tom Stroman, Robert Cady, Shoichi Kishigami, Ryo Higuchi, Youngjoon Kwon, Sergey Troitsky, Motoki Hayashi, Masaomi Ono, John Belz, Kozo Fujisue, Stanton Thomas, Kinya Hibino, Elliott Barcikowski, Matt Potts, Taka Tomida, Dmitri Ivanov, John Matthews, Samuel Blake, Ryuhei Arimura, J. Remington, M. Ohnishi, Taichi Inadomi, Koichi Sekino, Shoichi Ogio, Keijiro Mukai, J. Yang, P. Tinyakov, K. Yamazaki, G. Furlich, Takaaki Ishii, Pierre Sokolsky, Norimichi Shibata, Yuichiro Tameda, Shingo Kawana, Yusuke Kimura, Y. Omura, Tareq Abu-Zayyad, Yoshiki Tsunesada, Ryuji Takeishi, Daisuke Ikeda, Y. Takahashi, Mai Takamura, Koki Sato, Shigehiro Nagataki, Yana Zhezher, Jyunsei Chiba, Dongsu Ryu, William Hanlon, Hiroyuki Sagawa, Shigeharu Udo, Sang Woo Kim, D. C. Rodriguez, Kengo Sano, Tatsunobu Shibata, Tiffany Wong, Hirokazu Iwakura, Y. Takagi, HangBae Kim, Toshihiro Fujii, Mikhail Kuznetsov, Masato Takita, Keitaro Fujita, Yasunori Saito, Masaki Fukushima, Akitoshi Oshima, Yuto Kubota, Vladim Kuzmin, Kenta Yashiro, Grigory Rubtsov, Shunsuke Ozawa, Tomoyuki Nakamura, Manobu Tanaka, Y. Nakamura, Kohei Yada, Koichi Tanaka, Ryosuke Tsuda, Fumio Kakimoto, Ben Stokes, Ryota Fukushima, Naoaki Hayashida, M. Yamamoto, Monica Allen, Bokkyun Shin, Soomin Jeong, Michiyuki Chikawa, R. Sahara, Jon Paul Lundquist, Federico R. Urban, Arata Nakazawa, Nobuyuki Sakurai, Toshiyuki Nonaka, Yukio Uchihori, Kei Nakai, Ryota Onogi, J. H. Kim, Ricardo Gonzalez, Maxim Pshirkov, Toshio Matsuyama, T. Seki, Naoya Inoue, R. Mayta, Hirotaka Ito, Min Hyo Kim, S. Kawakami, Heungsu Shin, Yuto Arai, Saori Kasami, Ryo Nakamura, Hideki Tanaka, Hisono Tokuno, Yuma Shibasaki, Douglas Bergman, Akimichi Taketa, Eiji Nishio, Yuya Oku, Hideyuki Kawai, Shinnosuke Kurisu, Oleg Kalashev, Jeremy Smith, Toru Nakamura, Kenichi Kadota, Il Hung Park, Ryota Fujiwara, Naoto Sakaki, Katsuaki Kasahara, Katsumasa Kawata, Tsubasa Yoshioka, and Rasha Abbasi
Subjects: Physics, Detector, Cosmic ray, Knee region, Astrophysics, Composition (combinatorics)
Published: 2021
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13. Effects of Galactic magnetic field on the UHECR anisotropy studies

Author: Tomoyuki Nakamura, Sergey Troitsky, Taka Tomida, M. Yamamoto, Fugo Yoshida, J. Remington, M. Ohnishi, Taichi Inadomi, Elliott Barcikowski, Stanton Thomas, Pierre Sokolsky, Yuichiro Tameda, Hideaki Shimodaira, Hyoming Jeong, Dmitri Ivanov, R. Sahara, Shigehiro Nagataki, Yana Zhezher, Ryota Fujiwara, Sang Woo Kim, Yukio Uchihori, Manobu Tanaka, Ryo Higuchi, Ivan Kharuk, Keijiro Mukai, Koki Sato, ByongGu Cheon, Norimichi Shibata, Yuma Shibasaki, Ryota Onogi, J. H. Kim, Y. Omura, Keitaro Fujita, Naoto Sakaki, Aoi Iwasaki, Yusuke Kimura, K. H. Lee, Jihee Kim, Hideyuki Ohoka, R. Mayta, Kengo Sano, Gordon Thomson, K. Yamazaki, Tom Stroman, Robert Cady, Tareq Abu-Zayyad, Kinya Hibino, Toru Nakamura, Yasunori Saito, Douglas Bergman, Naoaki Hayashida, Takeshi Okuda, Igor Tkachev, Mikhail Kuznetsov, Min Hyo Kim, Kenichi Kadota, Michiyuki Chikawa, Rasha Abbasi, Ryosuke Tsuda, Yuta Tanoue, Naohiro Sone, Il Hung Park, Masato Takita, Soomin Jeong, John N. Matthews, Katsuaki Kasahara, H. Oda, Saori Kasami, Shinnosuke Kurisu, Motoki Hayashi, Takashi Sako, Katsumasa Kawata, Youngjoon Kwon, John Belz, Ben Stokes, J. P. Lundquist, Arata Nakazawa, S. Kawakami, Monica Allen, Bokkyun Shin, T. Seki, Yuto Kubota, Kozo Fujisue, Federico R. Urban, Hiroyuki Matsumiya, Nobuyuki Sakurai, Tsubasa Yoshioka, Naoya Inoue, Vladim Kuzmin, J. Yang, Shigeharu Udo, Kei Nakai, Kenta Yashiro, T. Fujii, Hiroyuki Sagawa, Maxim Pshirkov, Takafumi Uehama, Shingo Kawana, Kazumasa Kawata, Toshio Matsuyama, Y. Nakamura, Jeremy Smith, Yuya Oku, Kohei Yada, Koichi Tanaka, Akimichi Taketa, Koichi Sekino, Hideki Tanaka, Oleg Kalashev, Eiji Kido, Tatsunobu Shibata, William Hanlon, Daiki Shinto, Eiji Nishio, Kazuhiro Machida, Jyunsei Chiba, Dongsu Ryu, Telescope Array, Zach Zundel, Akitoshi Oshima, Priti Shah, P. Tinyakov, Heungsu Shin, Fumio Kakimoto, Shunsuke Ozawa, Isaac Myers, Ryuhei Arimura, Hisono Tokuno, Masahiro Takeda, Ken Honda, Ryuji Takeishi, Yoshiki Tsunesada, Daisuke Ikeda, Hideyuki Kawai, Hirokazu Iwakura, Y. Takagi, Tiffany Wong, Samuel Blake, Masaki Fukushima, Shoichi Ogio, Yuto Arai, Toshiyuki Nonaka, Shoichi Kishigami, Ricardo Gonzalez, G. Furlich, Takaaki Ishii, Y. Takahashi, Mai Takamura, Masaomi Ono, D. C. Rodriguez, HangBae Kim, Grigory Rubtsov, Ryota Fukushima, Hirotaka Ito, Ryo Nakamura, Charlie Jui, BayarJon Paul Lubsandorzhiev, Mayuko Minamino, Fumiya Shibata, and Matt Potts
Subjects: Physics, Astrophysics, Anisotropy, Magnetic field
Published: 2021
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14. Mass composition of Telescope Array's surface detectors events using deep learning

Author: Hideaki Shimodaira, Hyoming Jeong, Hiroyuki Sagawa, Fumiya Shibata, Ryuji Takeishi, Ryo Higuchi, Youngjoon Kwon, John Belz, Hideyuki Ohoka, Ryo Nakamura, Rasha Abbasi, Daiki Shinto, Ryuhei Arimura, Koichi Tanaka, Yoshiki Tsunesada, Daisuke Ikeda, Michiyuki Chikawa, Tiffany Wong, Masaki Fukushima, Matt Potts, Yuma Shibasaki, Priti Shah, Jon Paul Lundquist, K. Yamazaki, Pierre Sokolsky, Katsuaki Kasahara, Katsumasa Kawata, Tareq Abu-Zayyad, Fugo Yoshida, Masahiro Takeda, Takashi Sako, Ken Honda, Zach Zundel, Shigehiro Nagataki, Yana Zhezher, Ben Stokes, Tsubasa Yoshioka, Kenta Yashiro, Sergey Troitsky, R. Sahara, Douglas Bergman, Sang Woo Kim, Taka Tomida, Shingo Kawana, Charlie Jui, BayarJon Paul Lubsandorzhiev, J. Remington, Mayuko Minamino, Mikhail Kuznetsov, Min Hyo Kim, Shinnosuke Kurisu, William Hanlon, Ryota Fujiwara, Elliott Barcikowski, Dmitri Ivanov, Monica Allen, Naoto Sakaki, Tomoyuki Nakamura, G. Furlich, Takaaki Ishii, Federico R. Urban, Nobuyuki Sakurai, Saori Kasami, Keijiro Mukai, Bokkyun Shin, Toshio Matsuyama, K. H. Lee, Jihee Kim, Gordon Thomson, Ryota Fukushima, Samuel Blake, Shoichi Ogio, Hirotaka Ito, Yusuke Kimura, Tom Stroman, Robert Cady, Naoaki Hayashida, Norimichi Shibata, Y. Omura, S. Kawakami, D. C. Rodriguez, Keitaro Fujita, Jeremy Smith, HangBae Kim, Takeshi Okuda, Igor Tkachev, Akimichi Taketa, Hideki Tanaka, Stanton Thomas, Naohiro Sone, Isaac Myers, Eiji Nishio, Yuya Oku, Aoi Iwasaki, Oleg Kalashev, Hiroyuki Matsumiya, Toshihiro Fujii, Hisono Tokuno, H. Oda, Jyunsei Chiba, Grigory Rubtsov, Dongsu Ryu, Manobu Tanaka, Yuto Kubota, Koichi Sekino, Takafumi Uehama, Maxim Pshirkov, Hideyuki Kawai, P. Tinyakov, Toru Nakamura, Kenichi Kadota, M. Ohnishi, Y. Nakamura, Il Hung Park, Kohei Yada, Hirokazu Iwakura, Taichi Inadomi, Y. Takagi, Y. Takahashi, Mai Takamura, Eiji Kido, Kazuhiro Machida, Arata Nakazawa, Koki Sato, John Matthews, Toshiyuki Nonaka, Kei Nakai, Ivan Kharuk, J. Yang, Ricardo Gonzalez, Kengo Sano, Yasunori Saito, Yuta Tanoue, Fumio Kakimoto, Motoki Hayashi, Yuichiro Tameda, Kozo Fujisue, Shoichi Kishigami, Masaomi Ono, Masato Takita, Telescope Array, Shigeharu Udo, Kinya Hibino, M. Yamamoto, Yukio Uchihori, Ryota Onogi, J. H. Kim, R. Mayta, Vladim Kuzmin, Ryosuke Tsuda, Soomin Jeong, T. Seki, Naoya Inoue, Heungsu Shin, Yuto Arai, Tatsunobu Shibata, Akitoshi Oshima, Shunsuke Ozawa, and ByongGu Cheon
Subjects: Surface (mathematics), Telescope, Physics, Optics, business.industry, law, Deep learning, Detector, Artificial intelligence, Mass composition, business, law.invention
Published: 2021
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15. FOV direction and image size calibration of Fluorescence Detector using light source on UAV

Author: Telescope Array, Yasunori Saito, Shoichi Kishigami, Hideaki Shimodaira, Hyoming Jeong, Masaomi Ono, Ryo Higuchi, Ryuhei Arimura, Fugo Yoshida, Ryo Nakamura, Tomoyuki Nakamura, Charlie Jui, Min Hyo Kim, M. Ohnishi, Taichi Inadomi, Hideki Tanaka, Hisono Tokuno, BayarJon Paul Lubsandorzhiev, John Matthews, Yoshiki Tsunesada, Heungsu Shin, Manobu Tanaka, Koki Sato, Mayuko Minamino, J. Yang, Daisuke Ikeda, K. Yamazaki, Tareq Abu-Zayyad, M. Yamamoto, S. Kawakami, Kengo Sano, Sergey Troitsky, Fumio Kakimoto, Yuto Arai, Tiffany Wong, Taka Tomida, J. Remington, Koichi Sekino, Stanton Thomas, Kenta Yashiro, Ryosuke Tsuda, Saori Kasami, Monica Allen, Yukio Uchihori, Masaki Fukushima, Fumiya Shibata, Ben Stokes, Toshio Matsuyama, P. Tinyakov, Mikhail Kuznetsov, Soomin Jeong, Bokkyun Shin, Pierre Sokolsky, Norimichi Shibata, Hiroyuki Sagawa, K. H. Lee, Jihee Kim, Y. Omura, Ryota Onogi, J. H. Kim, Gordon Thomson, G. Furlich, Takaaki Ishii, Tom Stroman, Robert Cady, Y. Takahashi, Mai Takamura, ByongGu Cheon, Matt Potts, Shigehiro Nagataki, Yana Zhezher, Keitaro Fujita, Federico R. Urban, Nobuyuki Sakurai, Koichi Tanaka, Naoaki Hayashida, T. Seki, Naoya Inoue, R. Mayta, Jon Paul Lundquist, Sang Woo Kim, Hiroyuki Matsumiya, Yuta Tanoue, Yuichiro Tameda, Kinya Hibino, Motoki Hayashi, Takafumi Uehama, D. C. Rodriguez, Eiji Kido, Maxim Pshirkov, Kozo Fujisue, Takeshi Okuda, Kazuhiro Machida, HangBae Kim, Hideyuki Ohoka, Igor Tkachev, Naohiro Sone, Shigeharu Udo, Shinnosuke Kurisu, Grigory Rubtsov, Tatsunobu Shibata, H. Oda, Michiyuki Chikawa, Daiki Shinto, Arata Nakazawa, Kei Nakai, Akitoshi Oshima, Priti Shah, R. Sahara, Jeremy Smith, Akimichi Taketa, Eiji Nishio, Masahiro Takeda, Takashi Sako, Vladim Kuzmin, Ken Honda, Masato Takita, Shunsuke Ozawa, Isaac Myers, Hideyuki Kawai, Yuma Shibasaki, Douglas Bergman, Samuel Blake, Shoichi Ogio, Zach Zundel, Jyunsei Chiba, Dongsu Ryu, Hirokazu Iwakura, Y. Takagi, Ivan Kharuk, Toru Nakamura, Elliott Barcikowski, Kenichi Kadota, Dmitri Ivanov, Il Hung Park, Keijiro Mukai, Yusuke Kimura, Yuya Oku, Oleg Kalashev, Ryota Fukushima, Youngjoon Kwon, John Belz, Toshihiro Fujii, Yuto Kubota, Y. Nakamura, Kohei Yada, Hirotaka Ito, Rasha Abbasi, Aoi Iwasaki, Ryota Fujiwara, Naoto Sakaki, Katsuaki Kasahara, Katsumasa Kawata, Tsubasa Yoshioka, Ryuji Takeishi, Shingo Kawana, William Hanlon, Toshiyuki Nonaka, and Ricardo Gonzalez
Subjects: Physics, Light source, Optics, business.industry, Calibration, business, Image resolution, Fluorescence spectroscopy
Published: 2021
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16. UHECR mass composition from anisotropy of their arrival directions with the Telescope Array SD

Author: Katsuaki Kasahara, Ryota Fukushima, Takeshi Okuda, Igor Tkachev, Katsumasa Kawata, Daiki Shinto, Naohiro Sone, ByongGu Cheon, Shoichi Kishigami, Norimichi Shibata, Manobu Tanaka, Grigory Rubtsov, Ryuhei Arimura, M. Yamamoto, H. Oda, Masaomi Ono, Priti Shah, Y. Omura, Yoshiki Tsunesada, Tsubasa Yoshioka, Daisuke Ikeda, Masahiro Takeda, Tiffany Wong, Mikhail Kuznetsov, Ken Honda, K. H. Lee, Jihee Kim, Kenta Yashiro, Gordon Thomson, Hideyuki Ohoka, Yuichiro Tameda, Yukio Uchihori, Masaki Fukushima, Hiroyuki Sagawa, R. Sahara, Charlie Jui, Jyunsei Chiba, Dongsu Ryu, Tom Stroman, Fugo Yoshida, Robert Cady, Ryota Onogi, J. H. Kim, Shinnosuke Kurisu, Shingo Kawana, Ryota Fujiwara, BayarJon Paul Lubsandorzhiev, William Hanlon, Hirokazu Iwakura, Y. Takagi, R. Mayta, Hiroyuki Matsumiya, Koichi Tanaka, Mayuko Minamino, Vladim Kuzmin, Hideaki Shimodaira, Ivan Kharuk, Jon Paul Lundquist, Naoto Sakaki, Youngjoon Kwon, Kinya Hibino, John Belz, Ryo Nakamura, Hyoming Jeong, Michiyuki Chikawa, Keitaro Fujita, Takafumi Uehama, Saori Kasami, Fumiya Shibata, Ryo Higuchi, Yuya Oku, M. Ohnishi, Takashi Sako, Masato Takita, Eiji Kido, Toshiyuki Nonaka, Taichi Inadomi, Oleg Kalashev, Ryosuke Tsuda, Soomin Jeong, Ricardo Gonzalez, Rasha Abbasi, Kazuhiro Machida, Toshio Matsuyama, Min Hyo Kim, Matt Potts, Koki Sato, Kengo Sano, K. Yamazaki, Tareq Abu-Zayyad, Hideki Tanaka, Zach Zundel, S. Kawakami, Yasunori Saito, Peter Tinyakov, Samuel Blake, Shoichi Ogio, Shigeharu Udo, T. Seki, Toru Nakamura, Naoya Inoue, Jeremy Smith, John Matthews, J. Yang, Monica Allen, Kenichi Kadota, Hisono Tokuno, Yuta Tanoue, Akimichi Taketa, Bokkyun Shin, Eiji Nishio, Il Hung Park, Motoki Hayashi, Ben Stokes, Kozo Fujisue, Heungsu Shin, Federico R. Urban, Nobuyuki Sakurai, Hideyuki Kawai, Yuma Shibasaki, Koichi Sekino, Yuto Arai, Douglas Bergman, Tatsunobu Shibata, Y. Takahashi, Mai Takamura, Akitoshi Oshima, Shunsuke Ozawa, Maxim Pshirkov, Fumio Kakimoto, Sergey Troitsky, Taka Tomida, J. Remington, Naoaki Hayashida, Toshihiro Fujii, Yuto Kubota, Y. Nakamura, Kohei Yada, Elliott Barcikowski, Dmitri Ivanov, Keijiro Mukai, Yusuke Kimura, Stanton Thomas, Aoi Iwasaki, Tomoyuki Nakamura, Ryuji Takeishi, Pierre Sokolsky, Shigehiro Nagataki, Yana Zhezher, Isaac Myers, Sang Woo Kim, Hirotaka Ito, G. Furlich, Takaaki Ishii, D. C. Rodriguez, HangBae Kim, Arata Nakazawa, and Kei Nakai
Subjects: Telescope, Physics, law, Astrophysics, Mass composition, Anisotropy, law.invention
Published: 2021
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17. Analysis of TAx4 hybrid trigger and events

Author: Ivan Kharuk, Yuma Shibasaki, Jyunsei Chiba, Dongsu Ryu, Aoi Iwasaki, Hirokazu Iwakura, Y. Takagi, K. H. Lee, Jihee Kim, Ryota Fukushima, Ryuhei Arimura, Shigeharu Udo, Fumiya Shibata, Gordon Thomson, Hideki Tanaka, Fugo Yoshida, Tom Stroman, Robert Cady, Yoshiki Tsunesada, Sergey Troitsky, Daisuke Ikeda, Douglas Bergman, Taka Tomida, J. Remington, Tiffany Wong, John Matthews, ByongGu Cheon, Hiroyuki Matsumiya, Ryo Nakamura, Ryuji Takeishi, Masaki Fukushima, Hisono Tokuno, Ryosuke Tsuda, Soomin Jeong, M. Yamamoto, J. Yang, Matt Potts, Pierre Sokolsky, Min Hyo Kim, Yukio Uchihori, Naoaki Hayashida, Takashi Sako, T. Seki, Shigehiro Nagataki, Yana Zhezher, Akimichi Taketa, Naoya Inoue, Tatsunobu Shibata, Daiki Shinto, Sang Woo Kim, Eiji Nishio, Ryota Onogi, J. H. Kim, Priti Shah, Takafumi Uehama, G. Furlich, Takaaki Ishii, Saori Kasami, Hideaki Shimodaira, Hyoming Jeong, Masahiro Takeda, Charlie Jui, Ken Honda, R. Mayta, S. Kawakami, Heungsu Shin, BayarJon Paul Lubsandorzhiev, Ryo Higuchi, Toru Nakamura, Yuta Tanoue, Mayuko Minamino, Kenichi Kadota, Zach Zundel, Akitoshi Oshima, Eiji Kido, Elliott Barcikowski, Shingo Kawana, Shoichi Kishigami, Yuto Arai, Keitaro Fujita, Motoki Hayashi, Yuichiro Tameda, Hideyuki Ohoka, Il Hung Park, Kinya Hibino, Hirotaka Ito, Toshio Matsuyama, Kazuhiro Machida, Hiroyuki Sagawa, Hideyuki Kawai, D. C. Rodriguez, Dmitri Ivanov, Vladim Kuzmin, William Hanlon, Stanton Thomas, HangBae Kim, Shinnosuke Kurisu, Kozo Fujisue, Keijiro Mukai, K. Yamazaki, Masaomi Ono, Michiyuki Chikawa, Tareq Abu-Zayyad, Yusuke Kimura, Yasunori Saito, Koichi Tanaka, Grigory Rubtsov, Tomoyuki Nakamura, Jon Paul Lundquist, Koichi Sekino, Shunsuke Ozawa, Yuya Oku, P. Tinyakov, Isaac Myers, Oleg Kalashev, Masato Takita, Y. Takahashi, Mai Takamura, R. Sahara, Telescope Array, S. W. Kim, Manobu Tanaka, Toshiyuki Nonaka, Jeremy Smith, Norimichi Shibata, Y. Omura, Mikhail Kuznetsov, Ricardo Gonzalez, Ben Stokes, Samuel Blake, Toshihiro Fujii, Monica Allen, Shoichi Ogio, Yuto Kubota, Bokkyun Shin, Y. Nakamura, Kohei Yada, Federico R. Urban, Arata Nakazawa, Nobuyuki Sakurai, Kei Nakai, Youngjoon Kwon, John Belz, Rasha Abbasi, M. Ohnishi, Taichi Inadomi, Koki Sato, Fumio Kakimoto, Ryota Fujiwara, Kengo Sano, Naoto Sakaki, Katsuaki Kasahara, Katsumasa Kawata, Kenta Yashiro, Tsubasa Yoshioka, Maxim Pshirkov, Takeshi Okuda, Igor Tkachev, Naohiro Sone, and H. Oda
Published: 2021
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18. Reconstruction of air shower events measured by the surface detectors of the TAx4 experiment

Author: Fugo Yoshida, Fumio Kakimoto, Norimichi Shibata, Kinya Hibino, John Matthews, J. Yang, Y. Omura, Ivan Kharuk, Toshihiro Fujii, Hiroyuki Sagawa, Yuichiro Tameda, Hideki Tanaka, Yuma Shibasaki, Yuto Kubota, Hisono Tokuno, Mikhail Kuznetsov, Katsuaki Kasahara, Koichi Tanaka, Jon Paul Lundquist, M. Yamamoto, Katsumasa Kawata, Monica Allen, Bokkyun Shin, Hiroyuki Matsumiya, Tsubasa Yoshioka, Takafumi Uehama, Y. Nakamura, Kohei Yada, Yukio Uchihori, Hyomin Jeong, Tatsunobu Shibata, Ryota Onogi, J. H. Kim, Michiyuki Chikawa, ByongGu Cheon, Hideaki Shimodaira, Hyoming Jeong, Eiji Kido, M. Ohnishi, Taichi Inadomi, Kazuhiro Machida, Ryo Higuchi, Charlie Jui, Akitoshi Oshima, R. Mayta, Douglas Bergman, Keitaro Fujita, Elliott Barcikowski, Maxim Pshirkov, Manobu Tanaka, Pierre Sokolsky, Vladim Kuzmin, BayarJon Paul Lubsandorzhiev, Shunsuke Ozawa, Min Hyo Kim, Dmitri Ivanov, Koki Sato, Mayuko Minamino, Saori Kasami, Shigehiro Nagataki, Hideyuki Ohoka, Takashi Sako, K. Yamazaki, Tareq Abu-Zayyad, Keijiro Mukai, Youngjoon Kwon, Yasunori Saito, John Belz, Yana Zhezher, Sang Woo Kim, S. Kawakami, Jyunsei Chiba, Ryo Nakamura, Masato Takita, Yusuke Kimura, Daiki Shinto, Dongsu Ryu, Yuta Tanoue, Fumiya Shibata, Yuya Oku, K. H. Lee, Jihee Kim, Kengo Sano, Priti Shah, Hirokazu Iwakura, Y. Takagi, Motoki Hayashi, Oleg Kalashev, Kenta Yashiro, Zach Zundel, Masahiro Takeda, Ken Honda, Ben Stokes, Matt Potts, Kozo Fujisue, Stanton Thomas, Gordon Thomson, Toshiyuki Nonaka, Ryuhei Arimura, Ryosuke Tsuda, Akimichi Taketa, Tom Stroman, Robert Cady, Soomin Jeong, Ricardo Gonzalez, Federico R. Urban, Nobuyuki Sakurai, Koichi Sekino, Yoshiki Tsunesada, P. Tinyakov, Daisuke Ikeda, Eiji Nishio, T. Seki, Tomoyuki Nakamura, Ryota Fukushima, Naoya Inoue, Tiffany Wong, Toru Nakamura, Kenichi Kadota, Y. Takahashi, Mai Takamura, Masaki Fukushima, Takeshi Okuda, Igor Tkachev, Shingo Kawana, Naohiro Sone, Heungsu Shin, William Hanlon, H. Oda, Il Hung Park, G. Furlich, Takaaki Ishii, Hideyuki Kawai, Shinnosuke Kurisu, Yuto Arai, Toshio Matsuyama, Samuel Blake, Shoichi Ogio, Jeremy Smith, D. C. Rodriguez, Aoi Iwasaki, HangBae Kim, Ryota Fujiwara, Naoto Sakaki, Grigory Rubtsov, Rasha Abbasi, R. Sahara, Arata Nakazawa, Kei Nakai, Telescope Array, Isaac Myers, Hirotaka Ito, Ryuji Takeishi, Shoichi Kishigami, Masaomi Ono, Sergey Troitsky, Taka Tomida, J. Remington, Naoaki Hayashida, and Shigeharu Udo
Subjects: Surface (mathematics), Materials science, Optics, Air shower, business.industry, Detector, business
Published: 2021
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19. Telescope Array Surface Detector Energy and Arrival Direction Estimation Using Deep Learning

Author: Dmitri Ivanov, Yoshiki Tsunesada, Grigory Rubtsov, Takashi Sako, Oleg Kalashev, Mikhail Kuznetsov, and Yana Zhezher
Subjects: Estimation, business.industry, Deep learning, Artificial intelligence, business, Algorithm, Energy (signal processing), Mathematics
Published: 2021
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20. Hunting super-heavy dark matter with ultra-high energy photons

Author: Angela V. Olinto, Olivier Deligny, Marcus Niechciol, M. E. Bertaina, Glennys R. Farrar, Luis A. Anchordoqui, Philipp Papenbreer, Pierpaolo Savina, Andres Romero-Wolf, Dan Hooper, Julian Rautenberg, Piera Luisa Ghia, Jorge F. Soriano, Ralph Engel, Antonella Castellina, M. V. Kuznetsov, Tonia M. Venters, L. Perrone, Corinne Berat, Oleg Kalashev, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Anchordoqui, L. A., Berat, C., Bertaina, M. E., Castellina, A., Deligny, O., Engel, R., Farrar, G. R., Ghia, P. L., Hooper, D., Kalashev, O., Kuznetsov, M., Niechciol, M., Olinto, A. V., Papenbreer, P., Perrone, L., Rautenberg, J., Romero-Wolf, A., Savina, P., Soriano, J. F., and Venters, T. M.
Subjects: Photon, Astrophysics::High Energy Astrophysical Phenomena, Population, Dark matter, FOS: Physical sciences, Cosmic ray, Astrophysics, 01 natural sciences, 7. Clean energy, particle: acceleration, High Energy Physics - Phenomenology (hep-ph), Physical phenomena, cosmological model: parameter space, 0103 physical sciences, cosmic radiation: UHE, education, Superheavy dark matter, 010303 astronomy & astrophysics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Range (particle radiation), education.field_of_study, 010308 nuclear & particles physics, dark matter: mass, photon, Astronomy and Astrophysics, Particle acceleration, observatory, High Energy Physics - Phenomenology, High energy photon, Ultra-high energy photons, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - High Energy Astrophysical Phenomena
Abstract: At any epoch, particle physics must be open to completely unexpected discoveries, and that is reason enough to extend the reach of searches for ultra-high energy (UHE) photons. The observation of a population of photons with energies $E \gtrsim 100$ EeV would for example imply the existence of either a completely new physical phenomena, or particle acceleration mechanisms heretofore never seen or imagined. But as we outline in this Letter of Interest, there are also good arguments for super-heavy dark matter (SHDM) in a parameter range such that it could be discovered via its decays to, in particular, UHE photons. Only ultra-high energy cosmic ray observatories have capabilities to detect UHE photons. We first investigate how current and future observations can probe and constrain SHDM models in important directions, and then outline some of the scenarios that motivate such searches. We also discuss connections between constraints on SHDM and on the parameter values of cosmological models., SNOWMASS 2021 LoI. Accepted for publication in Astroparticle Physics
Published: 2021
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21. Sensitivity reach of gamma-ray measurements for strong cosmological magnetic fields

Author: Alexander Korochkin, Andrii Neronov, Dmitri Semikoz, Oleg Kalashev, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), and ANR-19-CE31-0020,MMUniverse,Nouvelles fenêtres sur l'Univers par l'astronomie multi-messenger(2019)
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010504 meteorology & atmospheric sciences, Field (physics), media_common.quotation_subject, Astrophysics::High Energy Astrophysical Phenomena, Cosmic microwave background, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, symbols.namesake, 0103 physical sciences, 010303 astronomy & astrophysics, Reionization, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, media_common, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Astronomy and Astrophysics, Universe, Redshift, Magnetic field, Space and Planetary Science, symbols, Hydrogen line, Astrophysics::Earth and Planetary Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Hubble's law, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: A primordial magnetic field with the strength in the 1-10 pG range can resolve the tension between different measurements of the Hubble constant and provide an explanation for the excess opacity in the 21 cm line at redshift $15, Comment: 9 pages, 7 figures, accepted to ApJ
Published: 2021
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22. Observations of the Origin of Downward Terrestrial Gamma‐Ray Flashes

Author: Hideaki Shimodaira, Hyoming Jeong, Hidemi Ito, N. Inoue, Takashi Sako, D. Ikeda, M. Ohnishi, Taichi Inadomi, Tareq Abu-Zayyad, Takayuki Tomida, Toru Nakamura, Federico R. Urban, Yuya Oku, Oleg Kalashev, Fumiya Shibata, Kenichi Kadota, S. Udo, C. C. H. Jui, Pierre Sokolsky, M. Takeda, Zach Zundel, Shigehiro Nagataki, Sergey Troitsky, Toshiyuki Nonaka, M. Byrne, Kengo Sano, R. Sahara, Matt Potts, K. H. Lee, Yasunori Saito, Hiroyuki Sagawa, Ben Stokes, T.-A. Shibata, Heungsu Shin, S. B. Thomas, H. Tokuno, H. Yamaoka, Yuta Tanoue, Motoki Hayashi, J. P. Lundquist, Gordon Thomson, Tom Stroman, Robert Cady, Kiyoshi Tanaka, Michiyuki Chikawa, J. Remington, Y. Hayashi, G. Furlich, Takaaki Ishii, Igor Tkachev, Naohiro Sone, Y. Zhezher, Yoshihiko Nakamura, Akimichi Taketa, J. D. Smith, T. Fujii, Keitaro Fujita, Y. J. Kwon, Hideyuki Ohoka, Vladim Kuzmin, H. Oda, K. Kawata, D. C. Rodriguez, S. Ozawa, BayarJon Paul Lubsandorzhiev, S. Jeong, B. K. Shin, D. Rodeheffer, Naoaki Hayashida, B. G. Cheon, T. Matuyama, Kenta Yashiro, Mayuko Minamino, M. Allen, Tiffany Wong, R. Takeishi, Yuichiro Tameda, Isaac Myers, K. Honda, Ryota Fujiwara, John N. Matthews, John Belz, Elliott Barcikowski, K. Kasahara, Masaki Fukushima, Akitoshi Oshima, Fumio Kakimoto, Dmitri Ivanov, Naoto Sakaki, Paul R. Krehbiel, M. Yamamoto, Y. Takahashi, Keijiro Mukai, Masaomi Ono, Masato Takita, M. Wallace, K. Yamazaki, H. Kawai, Masaaki Tanaka, Nobuyuki Sakurai, S. Kawakami, Hiroyuki Matsumiya, Saori Kasami, A. Di Matteo, T. Seki, Takafumi Uehama, Y. Tsunesada, Maxim Pshirkov, R. Mayta, R. LeVon, Hongsu Kim, Y. Uchihori, Eiji Kido, Kei Nakai, M. V. Kuznetsov, Kazuhiro Machida, K. Sekino, William Hanlon, T. Okuda, Inkyu Park, Grigory Rubtsov, William Rison, D. R. Bergman, R. U. Abbasi, Peter Tinyakov, Samuel Blake, Shoichi Ogio, J. H. Kim, Y. Omura, Dongsu Ryu, Mark A. Stanley, Hirokazu Iwakura, Y. Takagi, Ryo Nakamura, Kazuo Saito, H. Yoshii, M. Yosei, and K. Hibino
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Atmospheric Science, 010504 meteorology & atmospheric sciences, Conjunction (astronomy), Gamma ray, FOS: Physical sciences, Astrophysics, Electron, Radio atmospheric, 01 natural sciences, Lightning, High Energy Physics - Experiment, Physics - Atmospheric and Oceanic Physics, High Energy Physics - Experiment (hep-ex), Geophysics, Space and Planetary Science, Electric field, Atmospheric and Oceanic Physics (physics.ao-ph), Earth and Planetary Sciences (miscellaneous), Atmospheric electricity, Astrophysics - High Energy Astrophysical Phenomena, Cosmic-ray observatory, 0105 earth and related environmental sciences
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., Comment: Typo fixed and reference added. Manuscript is 36 pages. Supplemental Information is 42 pages. This paper is to be published in the Journal of Geophysical Research: Atmospheres. Online data repository: Open Science Framework DOI: 10.17605/OSF.IO/Z3XDA
Published: 2020
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23. Using Deep Learning to Enhance Event Geometry Reconstruction for the Telescope Array Surface Detector

Author: M. Yu. Kuznetsov, Takashi Sako, Yana Zhezher, Oleg Kalashev, Grigory Rubtsov, Yoshiki Tsunesada, and Dmitri Ivanov
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, business.industry, Deep learning, Astrophysics::High Energy Astrophysical Phenomena, Detector, FOS: Physical sciences, Flux, Cosmic ray, Scintillator, law.invention, Human-Computer Interaction, Telescope, Optics, Artificial Intelligence, law, Artificial intelligence, business, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Event (particle physics), Software, Energy (signal processing)
Abstract: The extremely low flux of ultra-high energy cosmic rays (UHECR) makes their direct observation by orbital experiments practically impossible. For this reason all current and planned UHECR experiments detect cosmic rays indirectly by observing the extensive air showers (EAS) initiated by cosmic ray particles in the atmosphere. The world largest statistics of the ultra-high energy EAS events is recorded by the networks of surface stations. In this paper we consider a novel approach for reconstruction of the arrival direction of the primary particle based on the deep convolutional neural network. The latter is using raw time-resolved signals of the set of the adjacent trigger stations as an input. The Telescope Array (TA) Surface Detector (SD) is an array of 507 stations, each containing two layers plastic scintillator with an area of $3$ m$^2$. The training of the model is performed with the Monte-Carlo dataset. It is shown that within the Monte-Carlo simulations, the new approach yields better resolution than the traditional reconstruction method based on the fitting of the EAS front. The details of the network architecture and its optimization for this particular task are discussed., Accepted by Machine Learning: Science and Technology
Published: 2020

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

Author: Takashi Sako, Hideaki Shimodaira, Hyoming Jeong, Ryo Higuchi, Inkyu Park, Kenta Yashiro, R. U. Abbasi, Tareq Abu-Zayyad, R. Azuma, Fumiya Shibata, F. Kakimoto, R. Ishimori, Daisuke Ikeda, K. Yamazaki, H. Kawai, Tiffany Wong, R. Takeishi, Masaki Fukushima, Maxim Pshirkov, Hongsu Kim, B. K. Shin, Hideki Tanaka, Toshiyuki Fujii, B. G. Cheon, T. Seki, John Belz, K. Kawata, BayarJon Paul Lubsandorzhiev, Akimichi Taketa, Min Hyo Kim, G. Furlich, Takaaki Ishii, Mayuko Minamino, K. Honda, Takayuki Tomida, Seok Ho Jeong, K. H. Lee, Yuta Tanoue, Masaaki Tanaka, D. C. Rodriguez, T.-A. Shibata, S. Kawakami, Motoki Hayashi, Zach Zundel, Peter Tinyakov, Samuel Blake, Gordon Thomson, Ben Stokes, Tom Stroman, Robert Cady, J. P. Lundquist, Shoichi Ogio, Kozo Fujisue, Hiroyuki Sagawa, M. Yamamoto, M. Yosei, Hidemi Ito, Grigory Rubtsov, Koichi Sekino, Kiyoshi Tanaka, D. R. Bergman, T. Suzawa, Y. Zhezher, Heungsu Shin, Isaac Myers, Katsuaki Kasahara, Y. Takahashi, Mai Takamura, Nobuyuki Sakurai, Yuya Oku, Oleg Kalashev, K. Hibino, Shoichi Kishigami, M. Allen, Sergey Troitsky, Toru Nakamura, Kenichi Kadota, T. Matsuyama, S. Ozawa, Masaomi Ono, Toshiyuki Nonaka, Y. Uchihori, Kei Nakai, Ryota Onogi, A. Di Matteo, J. Remington, Hideyuki Ohoka, R. Mayta, Vladim Kuzmin, Ryota Fujiwara, Keitaro Fujita, Saori Kasami, Shingo Kawana, Naoto Sakaki, Naoaki Hayashida, Yoshihiko Nakamura, William Hanlon, Priti Shah, T. Okuda, J. Yang, Masato Takita, R. Sahara, Pierre Sokolsky, M. Takeda, Shigehiro Nagataki, M. Abe, Akitoshi Oshima, Y. Tsunesada, H. Tokuno, Younghoon Kwon, J. D. Smith, J. H. Kim, Elliott Barcikowski, Dmitri Ivanov, Keijiro Mukai, Jyunsei Chiba, Dongsu Ryu, Hirokazu Iwakura, Y. Takagi, Kohei Yada, Y. Omura, Igor Tkachev, Naohiro Sone, H. Oda, N. Inoue, M. Ohnishi, Taichi Inadomi, Federico R. Urban, S. Udo, C. C. H. Jui, Kengo Sano, S. B. Thomas, Yasunori Saito, Yuichiro Tameda, John N. Matthews, S. W. Kim, Hiroyuki Matsumiya, M. Chikawa, Takafumi Uehama, Eiji Kido, M. V. Kuznetsov, Kazuhiro Machida, and Ryo Nakamura
Subjects: Physics, Pierre Auger Observatory, High Energy Astrophysical Phenomena (astro-ph.HE), 010504 meteorology & atmospheric sciences, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astronomy and Astrophysics, Cosmic ray, 01 natural sciences, Auger, Computational physics, law.invention, Telescope, Dipole, Amplitude, Space and Planetary Science, law, 0103 physical sciences, Ultra-high-energy cosmic ray, Astrophysics - High Energy Astrophysical Phenomena, Anisotropy, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences
Abstract: Motivated by the detection of a significant dipole structure in the arrival directions of ultrahigh-energy cosmic rays above 8 EeV reported by the Pierre Auger Observatory (Auger), we search for a large-scale anisotropy using data collected with the surface detector array of the Telescope Array Experiment (TA). With 11 years of TA data, a dipole structure in a projection of the right ascension is fitted with an amplitude of 3.3+- 1.9% and a phase of 131 +- 33 degrees. The corresponding 99% confidence-level upper limit on the amplitude is 7.3%. At the current level of statistics, the fitted result is compatible with both an isotropic distribution and the dipole structure reported by Auger., Comment: 6 pages, 3 figures, 1 table, Proofed title. Added journal reference and DOI
Published: 2020
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25. Constraining superheavy decaying dark matter with directional ultra-high energy gamma-ray limits

Author: Y. Zhezher, M. V. Kuznetsov, and Oleg Kalashev
Subjects: Pierre Auger Observatory, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Ursa Major, Annihilation, Ultra-high-energy gamma ray, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, Gamma ray, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Segue, Astrophysics::Cosmology and Extragalactic Astrophysics, Galaxy, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics::Galaxy Astrophysics
Abstract: Dwarf spheroidal galaxies are compact stellar objects with small or negligible astrophysical backgrounds, widely considered as promising targets to search for a signal from the dark matter decay and annihilation. We present constraints on the lifetime of the superheavy decaying dark matter branching to the $q\bar{q}$ channel in the mass range $10^{19} - 10^{25}$ eV based on the directional limits on the ultra-high-energy (UHE) gamma rays obtained by the Pierre Auger Observatory and the Telescope Array experiment. Attenuation effects during the propagation of UHE photons towards Earth are taken into account, with the strongest constraints derived for the Ursa Major II, Coma Berenices and Segue I galaxies., Comment: 7 pages, 4 figures
Published: 2020
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26. Heavy decaying dark matter and large-scale anisotropy of high-energy cosmic rays

Author: M. Yu. Kuznetsov and Oleg Kalashev
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Physics and Astronomy (miscellaneous), Solid-state physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, FOS: Physical sciences, Scale (descriptive set theory), Cosmic ray, Astrophysics, 01 natural sciences, Air shower, 0103 physical sciences, Ultra-high-energy cosmic ray, Astrophysics - High Energy Astrophysical Phenomena, 010306 general physics, Anisotropy
Abstract: We examine the role of the large--scale anisotropy of the high--energy cosmic ray distribution in a search for the heavy decaying dark matter (DM) signal. Using recent anisotropy measurements from the extensive air shower (EAS) observatories we constrain the lifetime of the DM particles with masses $10^{7}~\leq~M_X~\leq~10^{16}$ GeV. These constraints appear to be weaker than that obtained with the high energy gamma-ray limits. We also estimate the desired precision level for the anisotropy measurements to discern the decaying DM signal marginally allowed by the gamma-ray limits and discuss the prospects of the DM search with the modern EAS facilities., matches the journal version, 19 pages, 5 figures
Published: 2017
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27. The current status of research in ultrahigh-energy cosmic ray physics: A brief review

Author: M. Yu. Zotov, Maxim Pshirkov, and Oleg Kalashev
Subjects: Pierre Auger Observatory, Physics, Photon, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, General Physics and Astronomy, Astronomy, Cosmic ray, Astrophysics, 01 natural sciences, Auger, law.invention, Telescope, Observatory, law, 0103 physical sciences, Energy spectrum, Neutrino, 010303 astronomy & astrophysics
Abstract: The origin and nature of ultrahigh-energy cosmic rays (UHECRs, E > 1018 eV) is one of the most intriguing unsolved problems of modern astrophysics. This review is dedicated to the current status of research in this field. We describe the largest ongoing experiments carried out at the Pierre Auger Observatory and Telescope Array, at the first orbital detector of UHECRs, that is, TUS, and for the KLPVE and JEM-EUSO orbital telescopes, which are currently being developed. We discuss the latest results on the energy spectrum and mass composition of UHECRs and the relationship between UHECRs on the one hand and ultrahigh-energy neutrinos and photons on the other. Finally, we review the latest results on the anisotropy of the arrival directions of UHECRs, which is a crucially important area of research in the search for astrophysical sources of cosmic rays in the highest energy range.
Published: 2017
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28. Search for Ultra-High-Energy Neutrinos with the Telescope Array Surface Detector

Author: Koichi Sekino, Y. Takahashi, Mai Takamura, S. Kitamura, Hidemi Ito, K. Martens, Yuta Tanoue, Motoki Hayashi, J. P. Lundquist, K. Tsutsumi, John Belz, Heungsu Shin, Vladim Kuzmin, Takashi Sako, Toru Nakamura, Inkyu Park, Kenichi Kadota, Yana Zhezher, Hiroyuki Sagawa, D. R. Bergman, Maxim Pshirkov, Charlie Jui, BayarJon Paul Lubsandorzhiev, Mayuko Minamino, K. Yamazaki, M. Abe, K. H. Lee, K. Honda, Daisuke Ikeda, S. R. Stratton, Yasunori Kitamura, T.-A. Shibata, Gordon Thomson, Toshiyuki Fujii, Ryo Nakamura, Tom Stroman, Robert Cady, Masaaki Tanaka, Fumiya Shibata, M. Yamamoto, Nobuyuki Sakurai, Tiffany Wong, R. Takeishi, L. M. Scott, Hongsu Kim, Y. Hayashi, R. Ishimori, Masaki Fukushima, Kazuo Saito, Ben Stokes, N. Inoue, M. Ohnishi, Y. J. Kwon, Akimichi Taketa, Eiji Kido, B. G. Cheon, H. Kawai, K. Kawata, Federico R. Urban, M. V. Kuznetsov, Ryota Onogi, Hideyuki Ohoka, Pierre Sokolsky, A. Di Matteo, H. Yoshii, S. Udo, Kazuhiro Machida, Hideaki Shimodaira, Hyoming Jeong, M. Takeda, Shigehiro Nagataki, R. Mayta, T. Seki, Seok Ho Jeong, S. B. Thomas, Peter Tinyakov, Samuel Blake, Oleg Kalashev, Shoichi Ogio, Priti Shah, Igor Tkachev, Zach Zundel, S. Kawakami, Fumio Kakimoto, Tareq Abu-Zayyad, K. Nagasawa, H. Oda, H. Tokuno, R. Azuma, Toshiyuki Nonaka, K. Hibino, Kenta Yashiro, Akitoshi Oshima, Y. Tsunesada, Keitaro Fujita, B. K. Shin, H. Yamaoka, Michiyuki Chikawa, Masato Takita, J. D. Smith, Sergey Troitsky, Y. Omura, J. Remington, J. H. Kim, Elliott Barcikowski, Dmitri Ivanov, Jyunsei Chiba, Keijiro Mukai, Naoaki Hayashida, Shingo Kawana, Dongsu Ryu, Y. Takagi, Yasunori Saito, William Hanlon, T. Okuda, J. Yang, Yuichiro Tameda, John N. Matthews, Kohei Yada, Hideki Tanaka, Takayuki Tomida, K. Kasahara, Shoichi Kishigami, Kiyoshi Tanaka, Grigory Rubtsov, M. Allen, Masaomi Ono, R. Sahara, Ryota Fujiwara, Naoto Sakaki, Y. Uchihori, Kei Nakai, Rasha Abbasi, T. Matsuyama, S. Ozawa, T. Suzawa, J. Ogura, Isaac Myers, G. Furlich, Takaaki Ishii, and D. C. Rodriguez
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Detector, FOS: Physical sciences, General Physics and Astronomy, Flux, Observable, Cosmic ray, 01 natural sciences, law.invention, Telescope, Optics, Distribution function, law, 0103 physical sciences, Alternating decision tree, High Energy Physics::Experiment, Neutrino, 010306 general physics, business, Astrophysics - High Energy Astrophysical Phenomena
Abstract: We present an upper limit on the flux of ultra-high-energy down-going neutrinos for $E > 10^{18}\ \mbox{eV}$ derived with the nine years of data collected by the Telescope Array surface detector (05-11-2008 -- 05-10-2017). The method is based on the multivariate analysis technique, so-called Boosted Decision Trees (BDT). Proton-neutrino classifier is built upon 16 observables related to both the properties of the shower front and the lateral distribution function., 10 pages, 4 figures, accepted to JETP
Published: 2019

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

Author: Yasunori Saito, Yuichiro Tameda, John N. Matthews, G. Furlich, Takaaki Ishii, Takayuki Tomida, Heungsu Shin, D. C. Rodriguez, Fumio Kakimoto, Hideki Tanaka, Hideyuki Ohoka, Pierre Sokolsky, Elliott Barcikowski, M. Takeda, Shigehiro Nagataki, Yana Zhezher, K. Hibino, Dmitri Ivanov, Douglas Bergman, Hideaki Shimodaira, Hyoming Jeong, Keijiro Mukai, Younghoon Kwon, T. Suzawa, K. Martens, Eiji Kido, Kenta Yashiro, M. V. Kuznetsov, K. Tsutsumi, Kazuhiro Machida, K. Yamazaki, Isaac Myers, Sergey Troitsky, K. H. Lee, Grigory Rubtsov, T.-A. Shibata, Hidemi Ito, J. Remington, Gordon Thomson, BayarJon Paul Lubsandorzhiev, K. Kasahara, Tom Stroman, Shoichi Kishigami, Robert Cady, Mayuko Minamino, John Belz, Hiroyuki Sagawa, Kiyoshi Tanaka, Kuzmin, Maxim Pshirkov, K. Honda, J. H. Kim, Toshio Seki, Y. Uchihori, Kei Nakai, Masaaki Tanaka, Naoaki Hayashida, Akitoshi Oshima, Y. Tsunesada, Y. Omura, Fumiya Shibata, Masaomi Ono, Toshiyuki Nonaka, R. Sahara, M. Allen, Takashi Sako, R. Ishimori, Hongsu Kim, Toru Nakamura, Kohei Yada, Igor Tkachev, Kenichi Kadota, Inkyu Park, Shingo Kawana, Jyunsei Chiba, Dongsu Ryu, H. Oda, T. Fujii, Keitaro Fujita, Y. Takagi, Akimichi Taketa, Ben Stokes, Tareq Abu-Zayyad, N. Inoue, B. G. Cheon, H. Kawai, B. K. Shin, M. Ohnishi, Federico R. Urban, S. Udo, C. C. H. Jui, Oleg Kalashev, William Hanlon, S. B. Thomas, S. Kawakami, T. Okuda, Rasha Abbasi, Seok Ho Jeong, J. Yang, L. M. Scott, Y. Hayashi, M. Yamamoto, Priti Shah, K. Kawata, Zach Zundel, Nobuyuki Sakurai, Ryota Onogi, A. Di Matteo, Daisuke Ikeda, Ryota Fujiwara, R. Mayta, S. R. Stratton, Tiffany Wong, Naoto Sakaki, R. Takeishi, Ryo Nakamura, Kazuo Saito, Masaki Fukushima, H. Yoshii, R. Azuma, T. Matsuyama, S. Ozawa, Masato Takita, H. Yamaoka, Michiyuki Chikawa, H. Tokuno, J. D. Smith, Peter Tinyakov, Samuel Blake, Shoichi Ogio, Yuta Tanoue, Motoki Hayashi, J. P. Lundquist, Koichi Sekino, Y. Takahashi, Mai Takamura, and M. Abe
Subjects: Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Photon flux, Library science, FOS: Physical sciences, Astronomy and Astrophysics, 01 natural sciences, Joint research, High energy photon, Science research, Space and Planetary Science, 0103 physical sciences, Research policy, Science policy, Astrophysics - High Energy Astrophysical Phenomena, 010306 general physics, 010303 astronomy & astrophysics, Vice president
Abstract: The surface detector (SD) of the Telescope Array (TA) experiment allows one to indirectly detect photons with energies of order $10^{18}$ 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 (EAS) are separated from the hadron-induced EAS 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. Average 95% C.L. upper limits for the point-source flux of photons with energies greater than $10^{18}$, $10^{18.5}$, $10^{19}$, $10^{19.5}$ and $10^{20}$ eV are $0.094$, $0.029$, $0.010$, $0.0073$ and $0.0058$ km$^{-2}$yr$^{-1}$ respectively. For the energies higher than $10^{18.5}$ 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., Comment: accepted to MNRAS, 11 pages, 4 figures, 2 tables; results in text-file format are supplemented to paper source
Published: 2019
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30. The Cosmic-Ray Composition between 2 PeV and 2 EeV Observed with the TALE Detector in Monocular Mode

Author: BayarJon Paul Lubsandorzhiev, Mayuko Minamino, K. Honda, Masaaki Tanaka, Ryuji Takeishi, Hiroyuki Sagawa, Yasunori Saito, Pierre Sokolsky, B. K. Shin, M. Takeda, M. Yamamoto, Shigehiro Nagataki, R. Sahara, Toshiyuki Fujii, Shingo Kawana, William Hanlon, T. Okuda, J. Yang, M. Allen, Seok Ho Jeong, Nobuyuki Sakurai, K. H. Lee, T.-A. Shibata, Shoichi Kishigami, Yuichiro Tameda, John N. Matthews, Zach Zundel, T. Suzawa, Fugo Yoshida, Gordon Thomson, Tom Stroman, Fumiya Shibata, Ryota Onogi, Saori Kasami, D. Ikeda, Robert Cady, S. W. Kim, Ryosuke Tsuda, Isaac Myers, Hidemi Ito, R. Mayta, Masaomi Ono, H. Kawai, K. Kawata, N. Inoue, B. G. Cheon, Katsuaki Kasahara, J. H. Kim, Takashi Sako, T. Seki, Kiyoshi Tanaka, Koichi Sekino, M. Ohnishi, Min Hyo Kim, Takayuki Tomida, Grigory Rubtsov, Hideki Tanaka, Peter Tinyakov, Samuel Blake, Toshiyuki Nonaka, Taichi Inadomi, Norimichi Shibata, Y. Omura, Hideaki Shimodaira, Hyoming Jeong, Shoichi Ogio, Younghoon Kwon, Inkyu Park, John Belz, T. Matsuyama, Ryo Higuchi, Ryota Fukushima, S. Ozawa, Katsuya Yamazaki, Y. Nakamura, Federico R. Urban, Heungsu Shin, Kohei Yada, S. Kawakami, Keitaro Fujita, Y. Takahashi, Mai Takamura, Elliott Barcikowski, R. U. Abbasi, Y. Uchihori, Kei Nakai, Maxim Pshirkov, Dmitri Ivanov, S. Udo, C. C. H. Jui, Koki Sato, Tiffany Wong, Yuto Arai, Keijiro Mukai, Hiroyuki Matsumiya, Masaki Fukushima, Yusuke Kimura, Akimichi Taketa, Yuta Tanoue, Ryota Fujiwara, M. Chikawa, Takafumi Uehama, Tareq Abu-Zayyad, Motoki Hayashi, G. Furlich, Takaaki Ishii, J. P. Lundquist, Jyunsei Chiba, Naoto Sakaki, Daiki Shinto, Eiji Kido, M. V. Kuznetsov, Kazuhiro Machida, D. C. Rodriguez, Kozo Fujisue, Kengo Sano, Priti Shah, Dongsu Ryu, S. B. Thomas, Hirokazu Iwakura, Y. Takagi, Igor Tkachev, Naohiro Sone, H. Oda, Kenta Yashiro, Masato Takita, F. Kakimoto, Hongsu Kim, Sergey Troitsky, J. Remington, Naoaki Hayashida, Akitoshi Oshima, Y. Tsunesada, Ben Stokes, Y. Zhezher, Hideyuki Ohoka, Vladim Kuzmin, Toru Nakamura, Kenichi Kadota, M. Abe, Yuya Oku, Oleg Kalashev, Ryo Nakamura, D. R. Bergman, K. Hibino, H. Tokuno, and J. D. Smith
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Astroparticle physics, Physics, Monocular, Astrophysics::High Energy Astrophysical Phenomena, Detector, Mode (statistics), FOS: Physical sciences, Astronomy and Astrophysics, Cosmic ray, Astrophysics, 030226 pharmacology & pharmacy, 01 natural sciences, 03 medical and health sciences, 0302 clinical medicine, Space and Planetary Science, 0103 physical sciences, Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics
Abstract: We report on a measurement of the cosmic ray composition by the Telescope Array Low-Energy Extension (TALE) air fluorescence detector (FD). By making use of the Cherenkov light signal in addition to air fluorescence light from cosmic ray (CR) induced extensive air showers, the TALE FD can measure the properties of the cosmic rays with energies as low as $\sim 2$ PeV and exceeding 1 EeV. In this paper, we present results on the measurement of $X_{\rm max}$ distributions of showers observed over this energy range. Data collected over a period of $\sim 4$ years was analyzed for this study. The resulting $X_{\rm max}$ distributions are compared to the Monte Carlo (MC) simulated data distributions for primary cosmic rays with varying composition and a 4-component fit is performed. The comparison and fit are performed for energy bins, of width 0.1 or 0.2 in $\log_{10} (E/{\rm eV})$, spanning the full range of the measured energies. We also examine the mean $X_{\rm max}$ value as a function of energy for cosmic rays with energies greater than $10^{15.8}$ eV. Below $10^{17.3}$ eV, the slope of the mean $X_{\rm max}$ as a function of energy (the elongation rate) for the data is significantly smaller than that of all elements in the models, indicating that the composition is becoming heavier with energy in this energy range. This is consistent with a rigidity-dependent cutoff of events from galactic sources. Finally, an increase in the $X_{\rm max}$ elongation rate is observed at energies just above $10^{17}$ eV indicating another change in the cosmic rays composition., 20 pages, 22 figures, accepted for publication in ApJ
Published: 2021
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31. Identifying nearby sources of ultra-high-energy cosmic rays with deep learning

Author: Oleg Kalashev, Mikhail Zotov, and Maxim Pshirkov
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), FOS: Computer and information sciences, Pierre Auger Observatory, Physics, Computer Science - Machine Learning, Active galactic nucleus, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, HEALPix, Centaurus A, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astronomy and Astrophysics, Celestial sphere, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Machine Learning (cs.LG), 0103 physical sciences, Ultra-high-energy cosmic ray, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics::Galaxy Astrophysics
Abstract: We present a method to analyse arrival directions of ultra-high-energy cosmic rays (UHECRs) using a classifier defined by a deep convolutional neural network trained on a HEALPix grid. To illustrate a high effectiveness of the method, we employ it to estimate prospects of detecting a large-scale anisotropy of UHECRs induced by a nearby source with an (orbital) detector having a uniform exposure of the celestial sphere and compare the results with our earlier calculations based on the angular power spectrum. A minimal model for extragalactic cosmic rays and neutrinos by Kachelrie{\ss}, Kalashev, Ostapchenko and Semikoz (2017) is assumed for definiteness and nearby active galactic nuclei Centaurus A, M82, NGC 253, M87 and Fornax A are considered as possible sources of UHECRs. We demonstrate that the proposed method drastically improves sensitivity of an experiment by decreasing the minimal required amount of detected UHECRs or the minimal detectable fraction of from-source events several times compared to the approach based on the angular power spectrum. We also test robustness of the neural networks against different models of the large-scale Galactic magnetic fields and variations of the mass composition of UHECRs, and consider situations when there are two nearby sources or the dominating source is not known a~priori. In all cases, the neural networks demonstrate good performance unless the test models strongly deviate from those used for training. The method can be readily applied to the analysis of data of the Telescope Array, the Pierre Auger Observatory and other cosmic ray experiments., Comment: v2: a major extension of the 1st version, which is kept almost intact as sections 1-4; 21 pages v3: to be published in JCAP. Numbers in tables fixed, a few minor changes, conclusions unchanged. The code and trained models are available at https://github.com/okolo/ml_cr_aniso
Published: 2020
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32. Using Deep Learning in Ultra-High Energy Cosmic Ray Experiments

Author: Oleg Kalashev
Subjects: Physics, History, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Deep learning, Astrophysics::Instrumentation and Methods for Astrophysics, Ultra-high-energy cosmic ray, Astrophysics, Artificial intelligence, business, Computer Science Applications, Education
Abstract: The extremely low flux of ultra-high energy cosmic rays (UHECR) makes their direct observation by orbital experiments practically impossible. For this reason all current and planned UHECR experiments detect cosmic rays indirectly by observing the extensive air showers (EAS) initiated by cosmic ray particles in the atmosphere. Various types of shower observables are analyzed in the modern UHECR experiments including a secondary radio signal and fluorescent light from the excited nitrogen molecules. Most of the data is collected by the network of surface stations which allows to measure the lateral EAS profile. The raw observables in this case are the time-resolved signals for the set of adjacent triggered stations. The Monte Carlo shower simulation is performed in order to recover the primary particle properties. In traditional techniques the MC simulation is used to fit some synthetic observables such as the shower rise time, the shower front curvature and the particle density normalized to a given distance from the core. In this talk we’ll consider an alternative approach based on the deep convolutional neural network trained on a large Monte-Carlo dataset, using the detector signal time series as an input. The above approach has proven its efficiency with the Monte-Carlo simulations of the Telescope Array Observatory surface detector. We’ll discuss in detail how the network architecture is optimized for this particular task.
Published: 2020
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33. Prospects of detecting a large-scale anisotropy of ultra-high-energy cosmic rays from a nearby source with the K-EUSO orbital telescope

Author: Oleg Kalashev, Maxim Pshirkov, and Mikhail Zotov
Subjects: Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Active galactic nucleus, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Centaurus A, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astronomy and Astrophysics, Cosmic ray, Celestial sphere, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, law.invention, Telescope, law, 0103 physical sciences, Ultra-high-energy cosmic ray, Neutrino, Anisotropy, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Astrophysics::Galaxy Astrophysics
Abstract: KLYPVE-EUSO (K-EUSO) is a planned orbital detector of ultra-high-energy cosmic rays (UHECRs), which is to be deployed on board the International Space Station. K-EUSO is expected to have a uniform exposure over the celestial sphere and register from 120 to 500 UHECRs at energies above 57 EeV in a 2-year mission. We employed the TransportCR and CRPropa 3 packages to estimate prospects of detecting a large-scale anisotropy of ultra-high-energy cosmic rays from a nearby source with K-EUSO. Nearby active galactic nuclei Centaurus A, M82, NGC 253, M87 and Fornax A were considered as possible sources of UHECRs. A minimal model for extragalactic cosmic rays and neutrinos by Kachelriess, Kalashev, Ostapchenko and Semikoz (2017) was chosen for definiteness. We demonstrate that an observation of $\gtrsim300$ events will allow detecting a large-scale anisotropy with a high confidence level providing the fraction of from-source events is $\simeq$10-15%, depending on a particular source. The threshold fraction decreases with an increasing sample size. We also discuss if an overdensity originating from a nearby source can be observed at around the ankle in case a similar anisotropy is found beyond 57 EeV. The results are generic and hold for other future experiments with a uniform exposure of the celestial sphere., 18 pages; version 2: discussion extended, references added, results unchanged; version 3: numerous changes to address comments of the referee; accepted by JCAP
Published: 2018

34. Testing a reported correlation between arrival directions of ultrahigh-energy cosmic rays and a flux pattern from nearby starburst galaxies using Telescope Array data

Author: H. Kawai, Grigory Rubtsov, T. Seki, Hideaki Shimodaira, Hyoming Jeong, Toshitsugu Fujii, Shingo Kawana, G. Furlich, Takaaki Ishii, Oleg Kalashev, William Hanlon, T. Goto, K. Martens, T. Okuda, J. Yang, D. C. Rodriguez, K. Tsutsumi, M. Abe, Y. Uchihori, Elliott Barcikowski, S. Kitamura, Dmitri Ivanov, Hidemi Ito, T. Suzawa, Keijiro Mukai, Hiroyuki Sagawa, Tareq Abu-Zayyad, Maxim Pshirkov, Kenta Yashiro, Yasunori Saito, Toru Nakamura, Isaac Myers, Kenichi Kadota, R. Yamane, R. Sahara, K. Nagasawa, Heungsu Shin, Yuichiro Tameda, John N. Matthews, Ben Stokes, Fumio Kakimoto, M. Allen, L. M. Scott, Y. Hayashi, K. Yamazaki, Vladim Kuzmin, Y. J. Kwon, M. Yamamoto, K. Hibino, K. Kawata, S. Jeong, B. G. Cheon, Hideyuki Ohoka, Charlie Jui, Ryo Nakamura, K. H. Lee, T.-A. Shibata, Gordon Thomson, Nobuyuki Sakurai, Sergey Troitsky, Tom Stroman, Akimichi Taketa, Robert Cady, Kazuo Saito, J. H. Kim, Igor Tkachev, BayarJon Paul Lubsandorzhiev, J. Remington, Mayuko Minamino, K. Honda, John Belz, Yasunori Kitamura, Y. Omura, S. Kawakami, H. Oda, D. R. Bergman, H. Yoshii, Masaaki Tanaka, A. Di Matteo, Inkyu Park, Fumiya Shibata, Ryota Onogi, R. Ishimori, Kiyoshi Tanaka, Naoaki Hayashida, Takayuki Tomida, Y. Yoneda, N. Inoue, M. Ohnishi, Federico R. Urban, Akitoshi Oshima, Y. Tsunesada, Pierre Sokolsky, S. Udo, Hongsu Kim, R. Mayta, M. Takeda, S. B. Thomas, J. Ogura, Shigehiro Nagataki, Yana Zhezher, Eiji Kido, M. V. Kuznetsov, Kazuhiro Machida, K. Kasahara, Shoichi Kishigami, Hideki Tanaka, Zach Zundel, Daisuke Ikeda, R. Azuma, S. R. Stratton, Tiffany Wong, R. Takeishi, Masaki Fukushima, H. Yamaoka, Michiyuki Chikawa, Masaomi Ono, Toshiyuki Nonaka, Keitaro Fujita, B. K. Shin, Priti Shah, Peter Tinyakov, Samuel Blake, Shoichi Ogio, Masato Takita, Motoki Hayashi, J. P. Lundquist, Koichi Sekino, Y. Takahashi, Mai Takamura, Jyunsei Chiba, Dongsu Ryu, Y. Takagi, T. Matsuyama, S. Ozawa, Rasha Abbasi, S. Yoshida, Naoto Sakaki, H. Tokuno, and J. D. Smith
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, 010308 nuclear & particles physics, FOS: Physical sciences, Sigma, Flux, Astronomy and Astrophysics, Cosmic ray, Astrophysics, 01 natural sciences, Galaxy, Auger, law.invention, Telescope, Space and Planetary Science, law, 0103 physical sciences, Anisotropy, Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics, Energy (signal processing)
Abstract: The Pierre Auger Collaboration (Auger) recently reported a correlation between the arrival directions of cosmic rays with energies above 39 EeV and the flux pattern of 23 nearby starburst galaxies (SBGs). In this Letter, we tested the same hypothesis using cosmic rays detected by the Telescope Array experiment (TA) in the 9-year period from May 2008 to May 2017. Unlike the Auger analysis, we did not optimize the parameter values but kept them fixed to the best-fit values found by Auger, namely 9.7% for the anisotropic fraction of cosmic rays assumed to originate from the SBGs in the list and 12.9{\deg} for the angular scale of the correlations. The energy threshold we adopted is 43 EeV, corresponding to 39 EeV in Auger when taking into account the energy-scale difference between two experiments. We find that the TA data is compatible with isotropy to within 1.1{\sigma} and with the Auger result to within 1.4{\sigma}, meaning that it is not capable to discriminate between these two hypotheses., Comment: More accurate title, fixed an inconsistency in the declination range used, with a few figures slightly changing as a result, other minor revisions
Published: 2018

35. Study of muons from ultrahigh energy cosmic ray air showers measured with the Telescope Array experiment

Author: S. Kitamura, Hidemi Ito, Kenta Yashiro, Eiji Kido, M. V. Kuznetsov, Kazuhiro Machida, Jyunsei Chiba, Dongsu Ryu, Y. Takagi, Douglas Bergman, Toshiyuki Nonaka, K. Nagasawa, Hideki Tanaka, Elliott Barcikowski, J. H. Kim, T. Goto, G. Furlich, Takaaki Ishii, Y. Omura, Keitaro Fujita, Dmitri Ivanov, Pierre Sokolsky, J. Ogura, Yasunori Saito, B. K. Shin, Igor Tkachev, D. C. Rodriguez, R. Sahara, M. Takeda, Shigehiro Nagataki, Keijiro Mukai, Yuichiro Tameda, John N. Matthews, Akimichi Taketa, Rasha Abbasi, H. Oda, K. Yamazaki, M. Yamamoto, L. M. Scott, Nobuyuki Sakurai, T. Suzawa, Y. Yoneda, N. Inoue, M. Ohnishi, Sergey Troitsky, J. Remington, Y. Hayashi, Inkyu Park, Federico R. Urban, S. Udo, C. C. H. Jui, Isaac Myers, Y. J. Kwon, Hideyuki Ohoka, K. Kawata, Ryota Onogi, Koichi Sekino, A. Di Matteo, K. H. Lee, S. B. Thomas, T.-A. Shibata, Naoaki Hayashida, Takayuki Tomida, Gordon Thomson, T. Matsuyama, S. Ozawa, R. Mayta, Hongsu Kim, Priti Shah, Tom Stroman, Robert Cady, Y. Zhezher, Grigory Rubtsov, Hideaki Shimodaira, Hyoming Jeong, Y. Takahashi, Mai Takamura, K. Kasahara, Y. Uchihori, Shoichi Kishigami, S. Yoshida, Naoto Sakaki, R. Azuma, Masaomi Ono, Tareq Abu-Zayyad, R. Yamane, Kiyoshi Tanaka, Motoki Hayashi, J. P. Lundquist, Shingo Kawana, William Hanlon, M. Allen, H. Kawai, T. Okuda, J. Yang, H. Tokuno, J. D. Smith, Daisuke Ikeda, S. R. Stratton, Tiffany Wong, R. Takeishi, T. Seki, Masaki Fukushima, Masato Takita, K. Martens, K. Tsutsumi, Peter Tinyakov, Samuel Blake, Shoichi Ogio, Zach Zundel, Fumiya Shibata, R. Ishimori, Toshitsugu Fujii, Oleg Kalashev, H. Yamaoka, Michiyuki Chikawa, Ryo Nakamura, Kazuo Saito, H. Yoshii, Heungsu Shin, Toru Nakamura, K. Hibino, Kenichi Kadota, BayarJon Paul Lubsandorzhiev, Mayuko Minamino, K. Honda, Yasunori Kitamura, Masaaki Tanaka, John Belz, Hiroyuki Sagawa, Ben Stokes, B. G. Cheon, S. Kawakami, Maxim Pshirkov, Akitoshi Oshima, Y. Tsunesada, M. Abe, Fumio Kakimoto, Vladim Kuzmin, and S. Jeong
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Muon, COSMIC cancer database, Particle number, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, Hadron, FOS: Physical sciences, Cosmic ray, 01 natural sciences, law.invention, Telescope, Nuclear physics, Air shower, 13. Climate action, law, 0103 physical sciences, High Energy Physics::Experiment, Astrophysics - High Energy Astrophysical Phenomena, 010306 general physics
Abstract: One of the uncertainties in interpretation of ultra-high energy cosmic ray (UHECR) data comes from the hadronic interaction models used for air shower Monte Carlo (MC) simulations. The number of muons observed at the ground from UHECR-induced air showers is expected to depend upon the hadronic interaction model. One may therefore test the hadronic interaction models by comparing the measured number of muons with the MC prediction. In this paper, we present the results of studies of muon densities in UHE extensive air showers obtained by analyzing the signal of surface detector stations which should have high $\it{muon \, purity}$. The muon purity of a station will depend on both the inclination of the shower and the relative position of the station. In 7 years' data from the Telescope Array experiment, we find that the number of particles observed for signals with an expected muon purity of $\sim$65% at a lateral distance of 2000 m from the shower core is $1.72 \pm 0.10{\rm (stat.)} \pm 0.37 {\rm (syst.)}$ times larger than the MC prediction value using the QGSJET II-03 model for proton-induced showers. A similar effect is also seen in comparisons with other hadronic models such as QGSJET II-04, which shows a $1.67 \pm 0.10 \pm 0.36$ excess. We also studied the dependence of these excesses on lateral distances and found a slower decrease of the lateral distribution of muons in the data as compared to the MC, causing larger discrepancy at larger lateral distances.
Published: 2018
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36. Heavy decaying dark matter and IceCube high energy neutrinos

Author: M. Kachelrieß, Oleg Kalashev, and M. Yu. Kuznetsov
Subjects: Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Particle physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Dark matter, Electroweak interaction, High Energy Physics::Phenomenology, Gamma ray, FOS: Physical sciences, Context (language use), Photon energy, 01 natural sciences, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, High Energy Physics::Experiment, Neutrino, 010306 general physics, Astrophysics - High Energy Astrophysical Phenomena, Energy (signal processing)
Abstract: We examine the hypothesis of decaying heavy dark matter (HDM) in the context of the IceCube highest energy neutrino events and recent limits on the diffuse flux of high-energy photons. We consider dark matter (DM) particles $X$ of mass $10^{6}\leq M_X\leq~10^{16}$ GeV decaying on tree level into $X \rightarrow \nu \bar{\nu}$, $X \rightarrow e^+e^-$ and $X \rightarrow q \bar{q}$. The full simulation of hadronic and electroweak decay cascades and the subsequent propagation of the decay products through the interstellar medium allows us to determine the permitted values of $M_X$. We show that for leptonic decay channels it is possible to explain the IceCube highest energy neutrino signal without overproducing high-energy photons for $M_X~\lesssim~5.5 \cdot 10^{7}$ GeV and $1.5 \cdot 10^{8}~\lesssim~M_X~\lesssim~1.5 \cdot 10^{9}$ GeV, while hadronic decays contradict the gamma-ray limits for almost the whole range of $M_X$ values considered. The leptonic hypothesis can be probed by operating and planned gamma-ray observatories. For instance, the currently upgrading Carpet experiment will be capable to test a significant part of the remaining parameter window within one year of observation., Comment: 20 pages, 6 figures, journal version
Published: 2018

37. Constraints on the diffuse photon flux with energies above $10^{18}$ eV using the surface detector of the Telescope Array experiment

Author: Rasha Abbasi, Fumiya Shibata, S. Yoshida, T. Matsuyama, S. Ozawa, Naoto Sakaki, Yasunori Saito, John Belz, K. Nagasawa, R. Ishimori, S. Kitamura, Hidemi Ito, Ryo Nakamura, Motoki Hayashi, Toshiyuki Nonaka, Hideki Tanaka, Kazuo Saito, J. P. Lundquist, M. Yamamoto, Ben Stokes, B. G. Cheon, Heungsu Shin, T. Suzawa, Yuichiro Tameda, Isaac Myers, Inkyu Park, John N. Matthews, Douglas Bergman, Nobuyuki Sakurai, Ryota Onogi, A. Di Matteo, Koichi Sekino, M. Allen, R. Mayta, Y. Zhezher, Grigory Rubtsov, Kenta Yashiro, K. Martens, K. Tsutsumi, Keitaro Fujita, Y. Takahashi, Mai Takamura, L. M. Scott, H. Yoshii, Daisuke Ikeda, Eiji Kido, M. V. Kuznetsov, S. Kawakami, Y. Uchihori, R. Azuma, Toshitsugu Fujii, Kazuhiro Machida, S. R. Stratton, Y. Hayashi, Sergey Troitsky, B. K. Shin, Oleg Kalashev, Hongsu Kim, Hiroyuki Sagawa, Tiffany Wong, R. Takeishi, Charlie Jui, J. Remington, Pierre Sokolsky, K. Kawata, Masaki Fukushima, Akimichi Taketa, G. Furlich, Takaaki Ishii, J. H. Kim, BayarJon Paul Lubsandorzhiev, M. Takeda, Shigehiro Nagataki, Mayuko Minamino, Hideaki Shimodaira, Hyoming Jeong, D. C. Rodriguez, H. Kawai, Y. Omura, Kiyoshi Tanaka, K. Kasahara, K. Honda, Akitoshi Oshima, Y. Tsunesada, Shoichi Kishigami, Yasunori Kitamura, Naoaki Hayashida, Masaaki Tanaka, T. Seki, Masato Takita, J. Ogura, H. Yamaoka, Masaomi Ono, R. Sahara, Michiyuki Chikawa, Y. Yoneda, N. Inoue, Jyunsei Chiba, K. Hibino, Shingo Kawana, Fumio Kakimoto, Dongsu Ryu, K. Yamazaki, Tareq Abu-Zayyad, R. Yamane, Maksim Piskunov, William Hanlon, M. Ohnishi, Takayuki Tomida, Y. Takagi, T. Okuda, J. Yang, Federico R. Urban, Toru Nakamura, S. Udo, K. H. Lee, Kenichi Kadota, T.-A. Shibata, H. Tokuno, Zach Zundel, J. D. Smith, Priti Shah, Gordon Thomson, S. B. Thomas, Tom Stroman, Robert Cady, Igor Tkachev, Maxim Pshirkov, Elliott Barcikowski, Dmitri Ivanov, H. Oda, Keijiro Mukai, Peter Tinyakov, Samuel Blake, Shoichi Ogio, Vladim Kuzmin, T. Goto, S. Jeong, M. Abe, Y. J. Kwon, and Hideyuki Ohoka
Subjects: Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Muon, Photon, 010308 nuclear & particles physics, Detector, FOS: Physical sciences, Astronomy and Astrophysics, Curvature, 01 natural sciences, Computational physics, law.invention, High Energy Physics - Experiment, Telescope, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), Air shower, Distribution function, High Energy Physics - Phenomenology (hep-ph), law, 0103 physical sciences, Waveform, Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics
Abstract: We present the results of the search for ultra-high-energy photons with nine years of data from the Telescope Array surface detector. A multivariate classifier is built upon 16 reconstructed parameters of the extensive air shower. These parameters are related to the curvature and the width of the shower front, the steepness of the lateral distribution function, and the timing parameters of the waveforms sensitive to the shower muon content. A total number of two photon candidates found in the search is fully compatible with the expected background. The $95\%\,$CL limits on the diffuse flux of the photons with energies greater than $10^{18.0}$, $10^{18.5}$, $10^{19.0}$, $10^{19.5}$ and $10^{20.0}$ eV are set at the level of $0.067$, $0.012$, $0.0036$, $0.0013$, $0.0013~\mbox{km}^{-2}\mbox{yr}^{-1}\mbox{sr}^{-1}$ correspondingly., Comment: 7 pages, 2 figures
Published: 2018
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38. Simulations of ultra-high-energy cosmic rays propagation

Author: Eiji Kido and Oleg Kalashev
Subjects: Physics, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, Code (cryptography), General Physics and Astronomy, Intergalactic travel, Cosmic ray, Neutron, Astrophysics, Ultra-high-energy cosmic ray, Solver, Convection–diffusion equation, Computational physics
Abstract: We compare two techniques for simulation of the propagation of ultra-high-energy cosmic rays (UHECR) in intergalactic space: the Monte Carlo approach and a method based on solving transport equations in one dimension. For the former, we adopt the publicly available tool CRPropa and for the latter, we use the code TransportCR, which has been developed by the first author and used in a number of applications, and is made available online with publishing this paper. While the CRPropa code is more universal, the transport equation solver has the advantage of a roughly 100 times higher calculation speed. We conclude that the methods give practically identical results for proton or neutron primaries if some accuracy improvements are introduced to the CRPropa code.
Published: 2015
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39. Neutrinos in IceCube from active galactic nuclei

Author: Igor Tkachev, Dmitri Semikoz, and Oleg Kalashev
Subjects: Physics, Range (particle radiation), Active galactic nucleus, Astrophysics::High Energy Astrophysical Phenomena, Radiation field, Astrophysics::Instrumentation and Methods for Astrophysics, General Physics and Astronomy, Flux, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Accretion disc, High Energy Physics::Experiment, Neutrino
Abstract: Recently IceCube collaboration has reported first evidence for the astrophysical neutrinos. Observation corresponds to the total astrophysical neutrino flux of the order of 3·10 −8 GeV cm −2 s −1 sr −1 in a PeV energy range [1]. Active Galactic Nuclei (AGN) are natural candidate sources for such neutrinos. To model the neutrino creation in AGNs we study photopion production processes on the radiation field of the Shakura-Sunyaev accretion disks in the black hole vicinity. We show that this model can explain detected neutrino flux and avoids, at the same time, existing constraints from the gamma-ray and cosmic ray observations.
Published: 2015
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40. A NORTHERN SKY SURVEY FOR POINT-LIKE SOURCES OF EeV NEUTRAL PARTICLES WITH THE TELESCOPE ARRAY EXPERIMENT

Author: R. Ishimori, R. W. Springer, John Belz, Gordon Thomson, Federico R. Urban, K. Hibino, W. R. Cho, Nobuyuki Sakurai, Tomohiro Matsuda, Pierre Sokolsky, Sergey Troitsky, Masayuki Tanaka, ByongGu Cheon, Yuichiro Tameda, John N. Matthews, Younghoon Kwon, M. J. Chae, K. Martens, Y. Yoneda, S. I. Lim, Thomas Stroman, M. Ohnishi, S. Kawana, Kenichi Kadota, M. Abe, Il Hung Park, Douglas Bergman, H. Yoshii, S. Kitamura, Tomoyuki Nakamura, Fumio Kakimoto, H. Kawai, S. Udo, C. C. H. Jui, Mayuko Minamino, S. Nagataki, S. Kawakami, A. L. Sampson, K. Oki, Yasunori Kitamura, A. Oshima, Takaaki Ishii, S. B. Thomas, Elliott Barcikowski, Hirotaka Ito, Maxim Pshirkov, Masaomi Ono, K. Nagasawa, Dmitri Ivanov, Tatsunobu Shibata, Toshio Matsuyama, H. Shimodaira, HangBae Kim, Kenta Yashiro, Kenichi Tanaka, T. Suzawa, H. Tanaka, Isaac Myers, T. Goto, M. Takamura, Hiroyuki Sagawa, Shunsuke Ozawa, Naoya Inoue, K. Tsutsumi, J. Ogura, Priti Shah, B. T. Stokes, Igor Tkachev, Jon Paul Lundquist, Grigory Rubtsov, Akimichi Taketa, Oleg Kalashev, Takayuki Tomida, Masahiro Takeda, Naoaki Hayashida, L. M. Scott, H. Yamaoka, Ken Honda, A. Nozato, Y. Hayashi, V.A. Kuzmin, Zach Zundel, K. Machida, K. Yamazaki, Tareq Abu-Zayyad, R. Yamane, K. Mukai, H. Ohoka, J. Yang, J. Lan, R. Zollinger, B. K. Shin, Yoshiki Tsunesada, Daisuke Ikeda, S. R. Stratton, S. Yoshida, Katsuaki Kasahara, Tiffany Wong, R. Takeishi, Masaki Fukushima, Mark Allen, Masato Takita, Michiyuki Chikawa, Yukio Uchihori, Takahiro Fujii, Peter Tinyakov, Samuel Blake, Shoichi Ogio, J. H. Kim, Kazumasa Kawata, R. Azuma, J. D. Smith, D. Rodriguez, H. Tokuno, Eiji Kido, Toshiyuki Nonaka, Ruth A. Anderson, William Hanlon, Rasha Abbasi, Robert Cady, T. Okuda, G. Vasiloff, Jyunsei Chiba, Dongsu Ryu, and Fumiya Shibata
Subjects: Physics, High Energy Astrophysical Phenomena (astro-ph.HE), media_common.quotation_subject, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Flux, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Scintillator, Coincidence, law.invention, Telescope, Space and Planetary Science, Neutron flux, Sky, law, Astrophysics - High Energy Astrophysical Phenomena, Order of magnitude, Astrophysics::Galaxy Astrophysics, Fermi Gamma-ray Space Telescope, media_common
Abstract: We report on the search for steady point-like sources of neutral particles around 10$^{18}$ eV between 2008 May and 2013 May with the scintillator surface detector of the Telescope Array experiment. We found overall no significant point-like excess above 0.5 EeV in the northern sky. Subsequently, we also searched for coincidence with the Fermi bright Galactic sources. No significant coincidence was found within the statistical uncertainty. Hence, we set an upper limit on the neutron flux that corresponds to an averaged flux of 0.07 km$^{-2}$ yr$^{-1}$ for $E>1$ EeV in the northern sky at the 95% confidence level. This is the most stringent flux upper limit in a northern sky survey assuming point-like sources. The upper limit at the 95% confidence level on the neutron flux from Cygnus X-3 is also set to 0.2 km$^{-2}$ yr$^{-1}$ for $E>0.5$ EeV. This is an order of magnitude lower than previous flux measurements., 27 pages, 10 figures, 3 tables, accepted for publication in the Astrophysical Journal
Published: 2015

41. Energy spectrum of ultra-high energy cosmic rays observed with the Telescope Array using a hybrid technique

Author: S. Y. Roh, S. Yoshida, T. Kanbe, John Belz, Y. Murano, Thomas Stroman, Akitoshi Oshima, R. Zollinger, S. Kitamura, K. Nagasawa, Takayuki Tomida, Michiyuki Chikawa, Isaac Myers, H. Tokuno, K. Kitamoto, R. W. Springer, Igor Tkachev, R. Cady, Elliott Barcikowski, R. Aida, Eiji Kido, Toshiyuki Nonaka, Dmitri Ivanov, H. Fujii, H. Tanaka, Byung Gu Cheon, Yukio Uchihori, J. H. Kim, Pierre Sokolsky, Naoya Inoue, T. Fujii, Mayuko Minamino, Tatsunobu Shibata, Tomohiro Matsuda, Ross Anderson, Peter Tinyakov, Yasunori Kitamura, Samuel Blake, Shoichi Ogio, Toshio Matsuyama, K. Kobayashi, X. Zhou, Y. Yoneda, K. Tsutsumi, S. I. Lim, Zach Zundel, Sergey Troitsky, S. Machida, K. Martens, Hirotaka Ito, Younghoon Kwon, Shunsuke Ozawa, Mark Allen, S. Udo, C. C. H. Jui, Hiroyuki Sagawa, S. Kawana, H. Kawai, E. J. Cho, H. Shimodaira, M. Tanaka, S. Iwamoto, Y. Kondo, K. Oki, Tomoyuki Nakamura, S. Kawakami, Masaomi Ono, S. B. Thomas, S. Nagataki, Naoaki Hayashida, K. Miyata, R. Azuma, T. Matsuura, Fumiya Shibata, Y. Tsuyuguchi, Jon Paul Lundquist, Yoji Kobayashi, Kiyoshi Kuramoto, T. Shirahama, Takaaki Ishii, Gordon Thomson, B. T. Stokes, Yoshiki Tsunesada, K. Hibino, R. Ishimori, Daisuke Ikeda, S. R. Stratton, H. Yamaoka, Grigory Rubtsov, K. Hayashi, Hang Bae Kim, Katsuaki Kasahara, Akimichi Taketa, Tiffany Wong, T. Fukuda, Kenichi Tanaka, Masaki Fukushima, A. L. Sampson, S. Suzuki, Hyun-Il Kim, Douglas Bergman, Federico R. Urban, Masato Takita, Nobuyuki Sakurai, D. Oku, K. Hiyama, H. Yoshii, William Hanlon, Yukio Takahashi, G. Vasiloff, K. Ikuta, J. I. Shin, T. Okuda, Jyunsei Chiba, Maxim Pshirkov, Dongsu Ryu, Fumio Kakimoto, Y. Yamakawa, S. W. Nam, H. Ukai, Priti Shah, T. Iguchi, J. D. Smith, D. Rodriguez, Masahiro Takeda, Ken Honda, Yuichiro Tameda, John N. Matthews, M. Ohnishi, L. M. Scott, Y. Hayashi, V.A. Kuzmin, B. K. Shin, K. Yamazaki, Tareq Abu-Zayyad, R. Yamane, H. Ohoka, J. Yang, J. Lan, W. R. Cho, Kenichi Kadota, Il Hung Park, Y. Wada, and Oleg Kalashev
Subjects: Physics, Astrophysics::High Energy Astrophysical Phenomena, Detector, Astronomy and Astrophysics, Cosmic ray, Astrophysics, 7. Clean energy, Spectral line, Computational physics, law.invention, Telescope, Air shower, law, Energy spectrum, Ultra-high-energy cosmic ray
Abstract: We measure the spectrum of cosmic rays with energies greater than 10 18.2 eV with the fluorescence detectors (FDs) and the surface detectors (SDs) of the Telescope Array Experiment using the data taken in our first 2.3-year observation from May 27, 2008 to September 7, 2010. A hybrid air shower reconstruction technique is employed to improve accuracies in determination of arrival directions and primary energies of cosmic rays using both FD and SD data. The energy spectrum presented here is in agreement with our previously published spectra and the HiRes results.
Published: 2015

42. A minimal model for extragalactic high-energy particles

Author: Oleg Kalashev, M. Kachelriess, S. Ostapchenko, Dmitri Semikoz, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: Photon, accelerator, gamma ray: background, air, Astrophysics::High Energy Astrophysical Phenomena, cosmic radiation: energy, Cosmic ray, Astrophysics, 7. Clean energy, Spectral line, neutrino: flux, IceCube, gas, cosmic radiation: UHE, Physics, Range (particle radiation), cosmic radiation: spectrum, Astrophysics::Instrumentation and Methods for Astrophysics, showers, Galaxy, photon hadron: interaction, nucleus: heavy, atmosphere, galaxy, Neutrino, Maxima, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Energy (signal processing), model: minimal, cosmic radiation: flux
Abstract: We explain in a unified way the experimental data on ultrahigh energy cosmic rays (UHECR) and neutrinos, using a single source class and obeying limits on the extragalactic diffuse gamma-ray background (EGRB). If UHECRs only interact hadronically with gas around their sources, the resulting diffuse CR flux can be matched well to the observed one, providing at the same time large neutrino fluxes. Since the required fraction of heavy nuclei is, however, rather large, air showers in the Earth’s atmosphere induced by UHECRs with energies E >∼ 3 × 1018 eV would reach in such a case their maxima too high. Therefore additional photo-hadronic interactions of UHECRs close to the accelerator have to be present, in order to modify the nuclear composition of CRs in a relatively narrow energy interval. We include thus both photon and gas backgrounds, and combine the resulting CR spectra with the high-energy part of the Galactic CR fluxes predicted by the escape model. As result, we find a good description of experimental data on the total CR flux, the mean shower maximum depth Xmax and its width RMS(Xmax ) in the whole energy range above E ≃ 1017 eV. The predicted high-energy neutrino flux matches IceCube measurements, while the contribution to the EGRB is of order 30%. (C) Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).
Published: 2017
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43. Minimal model for extragalactic cosmic rays and neutrinos

Author: M. Kachelrieß, Dmitri Semikoz, Oleg Kalashev, S. Ostapchenko, AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)
Subjects: Photon, accelerator, gamma ray: background, air, [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], Astrophysics::High Energy Astrophysical Phenomena, cosmic radiation: energy, FOS: Physical sciences, Cosmic ray, Astrophysics, 01 natural sciences, 7. Clean energy, neutrino: flux, Spectral line, IceCube, gas, 0103 physical sciences, cosmic radiation: UHE, hadron hadron: interaction, 010303 astronomy & astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, showers: atmosphere, 010308 nuclear & particles physics, photon, nucleus, Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, Order (ring theory), 13. Climate action, galaxy, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Maxima, cosmic radiation: flux, model: minimal, Energy (signal processing)
Abstract: We aim to explain in a unified way the experimental data on ultrahigh energy cosmic rays (UHECR) and neutrinos, using a single source class and obeying limits on the extragalactic diffuse gamma-ray background (EGRB). If UHECRs only interact hadronically with gas around their sources, the resulting diffuse CR flux can be matched well to the observed one, providing at the same time large neutrino fluxes. However, air showers in the Earth's atmosphere induced by UHECRs with energies $E>3\times 10^{18}$ eV would reach in such a case their maxima too high. Therefore additional photo-hadronic interactions of UEHCRs close to the accelerator have to be present, in order to modify the nuclear composition of CRs in a relatively narrow energy interval. We include thus both photon and gas backgrounds, and combine the resulting CR spectra with the high-energy part of the Galactic CR fluxes predicted by the escape model. As result, we find a good description of experimental data on the total CR flux, the mean shower depth $X_\max$ and its width $RMS(X_\max)$ in the whole energy range above $E\simeq 10^{17}$ eV. The predicted high-energy neutrino flux matches IceCube measurements, while the contribution to the EGRB is of order 30%., v2: 7 pages, 6 eps figures; slightly extended version to appear in PRD
Published: 2017
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44. Prospects for future very high-energy gamma-ray sky survey: Impact of secondary gamma rays

Author: Yoshiyuki Inoue, Alexander Kusenko, and Oleg Kalashev
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Active galactic nucleus, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Gamma ray, FOS: Physical sciences, Astronomy, Astronomy and Astrophysics, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Cherenkov Telescope Array, Redshift, 13. Climate action, Sky, Intergalactic travel, Astrophysics - High Energy Astrophysical Phenomena, Blazar, media_common
Abstract: Very high-energy gamma-ray measurements of distant blazars can be well explained by secondary gamma rays emitted by cascades induced by ultra-high-energy cosmic rays. The secondary gamma rays will enable one to detect a large number of blazars with future ground based gamma-ray telescopes such as Cherenkov Telescope Array (CTA). We show that the secondary emission process will allow CTA to detect 100, 130, 150, 87, and 8 blazars above 30 GeV, 100 GeV, 300 GeV, 1 TeV, and 10 TeV, respectively, up to $z\sim8$ assuming the intergalactic magnetic field (IGMF) strength $B=10^{-17}$ G and an unbiased all sky survey with 0.5 hr exposure at each Field of View, where total observing time is $\sim540$ hr. These numbers will be 79, 96, 110, 63, and 6 up to $z\sim5$ in the case of $B=10^{-15}$ G. This large statistics of sources will be a clear evidence of the secondary gamma-ray scenarios and a new key to studying the IGMF statistically. We also find that a wider and shallower survey is favored to detect more and higher redshift sources even if we take into account secondary gamma rays., 8 pages, 3 figures, accepted for publication in Astroparticle Physics
Published: 2014
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45. Dark matter component decaying after recombination: constraints from diffuse gamma-ray and neutrino flux measurements

Author: Y. Zhezher, Oleg Kalashev, and Mikhail Yu. Kuznetsov
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Particle physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, Cepheid variable, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Dark matter, Cosmic microwave background, Gamma ray, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, Anisotropy, Recombination, Astrophysics - Cosmology and Nongalactic Astrophysics, Bar (unit)
Abstract: We consider scenario of the dark matter consisting of two fractions, stable part being dominant and a smaller unstable fraction, which has decayed after the recombination epoch. It has been suggested in Ref. [arxiv:1505.03644] that the above scenario may alleviate tension between high-redshift (CMB anisotropy) and low-redshift (cepheid variables and SNe Ia, cluster counts) cosmological measurements. We derive constraints on the heavy relics branching to $q\bar{q}$, $e^+e^-$, $\mu^+\mu^-$, $\tau^+\tau^-$, $\nu_e\bar{\nu_e}$, $\nu_\mu\bar{\nu_\mu}$, $W^+W^-$ and $\gamma\gamma$ in the above scenario by comparison of the secondary $\gamma$ and $\nu$ fluxes produced by the process with recent diffuse $\gamma$ and $\nu$ flux measurements., Comment: 9 pages, 5 figures
Published: 2019
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46. Prospects of testing an UHECR single source class model with the K-EUSO orbital telescope

Author: Mikhail Zotov, Maxim Pshirkov, and Oleg Kalashev
Subjects: Physics, Active galactic nucleus, 010308 nuclear & particles physics, QC1-999, Centaurus A, Cosmic ray, Celestial sphere, Astrophysics, 01 natural sciences, law.invention, Telescope, law, 0103 physical sciences, International Space Station, Neutrino, Anisotropy, 010303 astronomy & astrophysics
Abstract: KLYPVE-EUSO (K-EUSO) is a planned orbital detector of ultra-high energy cosmic rays (UHECRs), which is to be deployed on board the International Space Station. K-EUSO is expected to have a uniform exposure over the celestial sphere and register from 120 to 500 UHECRs at energies above 57 EeV in a 2-year mission. We employed the TransportCR and CRPropa 3 packages to estimate prospects of testing a minimal single source class model for extragalactic cosmic rays and neutrinos by Kachelrieß, Kalashev, Ostapchenko and Semikoz (2017) with K-EUSO in terms of the large-scale anisotropy. Nearby active galactic nuclei Centaurus A, M82, NGC 253, M87 and Fornax A were considered as possible sources of UHECRs. We demonstrate that an observation of more than 200 events will allow testing predictions of the model with a high confidence level providing the fraction of events arriving from any of the sources is ^10-15%, with a smaller contribution for larger samples. These numbers agree with theoretical expectations of a possible contribution of a single source in the UHECR flux. Thus, K-EUSO can provide good opportunities for verifying the minimal model basing on an analysis of the large-scale anisotropy of arrival directions of UHECRs.
Published: 2019
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47. Constraining heavy decaying dark matter with the high energy gamma-ray limits

Author: Oleg Kalashev and M. Yu. Kuznetsov
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, High energy, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, Photon flux, FOS: Physical sciences, Flux, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Nuclear physics, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Air shower, Observatory, 0103 physical sciences, Ultrahigh energy, Astrophysics - High Energy Astrophysical Phenomena, 010306 general physics
Abstract: We consider decaying dark matter with masses $10^{7} \lesssim M \lesssim 10^{16}$ GeV, as a source of ultra-high energy (UHE) gamma rays. Using recent limits on UHE gamma-ray flux for energies $E_\gamma > 2 \cdot 10^{14}$ eV, provided by extensive air shower observatories, we put limits on masses and lifetimes of the dark matter. We also discuss possible dark matter decay origin of tentative 100 PeV photon flux detected with EAS-MSU experiment., Comment: Journal version, to appear in PRD, 12 pages, 5 figures
Published: 2016
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48. Fluxes of diffuse gamma rays and neutrinos from cosmic-ray interactions with the circumgalactic gas

Author: Sergey Troitsky and Oleg Kalashev
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Astrophysics::High Energy Astrophysical Phenomena, Milky Way, Gamma ray, FOS: Physical sciences, Astronomy, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Radius, 01 natural sciences, Corona, Galaxy, Virial theorem, 0103 physical sciences, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, 010306 general physics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics
Abstract: The Milky Way is surrounded by a gravitationally bound gas corona extending up to the Galaxy's virial radius. Interactions of cosmic-ray particles with this gas give rise to energetic secondary gamma rays and neutrinos. We present a quantitative analysis of the neutrino and gamma-ray fluxes from the corona of the Milky Way together with a combined contribution of coronae of other galaxies. The high-energy neutrino flux is insufficient to explain the IceCube results, while the contribution to the FERMI-LAT diffuse gamma-ray flux is not negligible., Comment: 17 pages, 7 figures, revtex. V2: minor changes, version accepted by PRD
Published: 2016
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49. Diffuse CR, neutrino and gamma-ray fluxes from starburst and star-forming galaxies within the 'escape model'

Author: Dimitry Semikoz, Andrei Neronov, G. Giacinti, M. Kachelriess, and Oleg Kalashev
Subjects: Physics, Gamma ray, Astrophysics, Neutrino, Star (graph theory), Galaxy
Published: 2016
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50. Cascade photons as test of protons in UHECR

Author: Oleg Kalashev, A. Gazizov, and Veniamin Berezinsky
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Photon, Proton, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astronomy and Astrophysics, Cosmic ray, Astrophysics, Cherenkov Telescope Array, 01 natural sciences, Galaxy, Extragalactic background light, 0103 physical sciences, Neutrino, 010306 general physics, Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics, Fermi Gamma-ray Space Telescope
Abstract: An isotropic component of high energy $\gamma$-ray spectrum measured by Fermi LAT constrains the proton component of UHECR. The strongest restriction comes from the highest, $(580-820)$ GeV, energy bin. One more constraint on the proton component is provided by the IceCube upper bound on ultrahigh energy cosmogenic neutrino flux. We study the influence of these restrictions on the source properties, such as evolution and distribution of sources, their energy spectrum and admixture of nuclei. We also study the sensitivity of restrictions to various Fermi LAT galactic foreground models (model B being less restrictive), to the choice of extragalactic background light model and to overall normalization of the energy spectrum. We claim that the $\gamma$-ray-cascade constraints are stronger than the neutrino ones, and that however many proton models are viable. The basic parameters of such models are relatively large $\gamma_g$ and not very large $z_{\max}$. The allowance for H$e^4$ admixture also relaxes the restrictions. However we foresee that future CTA measurements of $\gamma$-ray spectrum at $E_\gamma \simeq (600 - 800)$ GeV, as well as resolving of more individual $\gamma$-ray sources, may rule out the proton-dominated cosmic ray models., Comment: Version accepted for publication in Astroparticle Physics. Most recent neutrino flux limits by IceCube were included to the tables. 14 pages, 13 figures
Published: 2016

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