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23 results on '"Nagano, Motohiko"'

1. AGASA Results and EUSO

Author

Adams, James H and Nagano, Motohiko

Subjects
Astrophysics
Abstract

Recently AGASA group reevaluated the energy estimation of AGSAS events and showed that the energy spectrum of cosmic rays extends without any sign of GZK-cutoff. Clustering of ultrahigh energy events within experimental angular resolution suggests the astronomical point sources and their distribution in whole sky may reveal the magnetic configuration of our galaxy and extragalactic magnetic field. Based on the AGASA results, we discuss what we can expect EUSO.

Published
2003

2. JEM-EUSOに向けた気球実験

Author

榊, 直人, 柴田, 徹, 角田, 知史, 上岡, 将宏, 吉田, 朱里, 滝澤, 慶之, 川崎, 賀也, 戎崎, 俊一, 梶野, 文義, 沢辺, 俊之, 井上, 覚太, 永野, 元彦, 高橋, 幸弘, 佐藤, 光輝, Sakaki, Naoto, Shibata, Toru, Takizawa, Yoshiyuki, Kawasaki, Yoshiya, Ebisuzaki, Toshikazu, Kajino, Fumiyoshi, Sawabe, Toshiyuki, Inoue, Kakuta, Nagano, Motohiko, Takahashi, Yukihiro, Sato, Mitsuteru, 榊, 直人, 柴田, 徹, 角田, 知史, 上岡, 将宏, 吉田, 朱里, 滝澤, 慶之, 川崎, 賀也, 戎崎, 俊一, 梶野, 文義, 沢辺, 俊之, 井上, 覚太, 永野, 元彦, 高橋, 幸弘, 佐藤, 光輝, Sakaki, Naoto, Shibata, Toru, Takizawa, Yoshiyuki, Kawasaki, Yoshiya, Ebisuzaki, Toshikazu, Kajino, Fumiyoshi, Sawabe, Toshiyuki, Inoue, Kakuta, Nagano, Motohiko, Takahashi, Yukihiro, and Sato, Mitsuteru

Abstract

会議情報: 大気球シンポジウム 平成19年度（2007年12月13-14日. 宇宙航空研究開発機構宇宙科学研究本部 (JAXA)(ISAS)）, 相模原市, 神奈川県), 著者人数: 14名, Meeting Information: Balloon Symposium 2007 (December 13-14, 2007. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan

Published
2017

3. JEM-EUSOに向けた気球実験

Author

Sakaki, Naoto, Shibata, Toru, Takizawa, Yoshiyuki, Kawasaki, Yoshiya, Ebisuzaki, Toshikazu, Kajino, Fumiyoshi, Sawabe, Toshiyuki, Inoue, Kakuta, Nagano, Motohiko, Takahashi, Yukihiro, and Sato, Mitsuteru

Abstract

大気球シンポジウム 平成19年度（2007年12月13-14日. 宇宙航空研究開発機構宇宙科学研究本部 (JAXA)(ISAS)）, 相模原市, 神奈川県), Balloon Symposium 2007 (December 13-14, 2007. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 著者人数: 14名, 資料番号: SA6000089035

Published
2008

4. 気球による夜光観測Ⅱ

Author

Sakaki, Naoki, Shibata, Toru, Takizawa, Yoshiyuki, Kawasaki, Yoshiya, Sato, Mitsuteru, Ebisuzaki, Toshikazu, Sawabe, Toshiyuki, Inoue, Kakuta, Kajino, Fumiyoshi, Nagano, Motohiko, and Takahashi, Yukihiro

Abstract

大気球シンポジウム 平成18年度（2007年1月15-16日. 宇宙航空研究開発機構宇宙科学研究本部 (JAXA)(ISAS)）, 相模原市, 神奈川県), Balloon Symposium 2006 (January 15-16, 2007. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 著者人数: 16名, 資料番号: SA6000090050

Published
2007

5. 気球による夜光観測

Author

Sakaki, Naoto, Shibata, Toru, Takizawa, Yoshiyuki, Kawasaki, Yoshiya, Sato, Mitsuteru, Ebisuzaki, Toshikazu, Sawabe, Toshiyuki, Kajino, Fumiyoshi, Nagano, Motohiko, Takahashi, Yukihiro, Saito, Yoshitaka, Yamada, Kazuhiko, and Kawasaki, Tomomi

Abstract

大気球シンポジウム 平成17年度（2006年1月23-24日. 宇宙航空研究開発機構宇宙科学研究本部 (JAXA)(ISAS)）, 相模原市, 神奈川県), Balloon Symposium 2005 (January 23-24, 2006. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 著者人数: 18名, 資料番号: SA6000068042

Published
2006

6. EUSO mission: Observation of extreme energy cosmic rays from the space by atmospheric fluorescent method

Author

Bertaina, M. E., Kajino, Fumiyoshi, Nagano, Motohiko, Ebisuzaki, Toshikazu, Takizawa, Yoshiyuki, Kawasaki, Yoshiya, Sato, Mitsuteru, Shibata, Toru, Sakaki, Naoto, and Inoue, Naoya

Subjects
Fresnel lens, 焦点面装置, multianode photomultiplier tube, 宇宙線シャワー, focal plane device, EUSO, 国際宇宙ステーション, 望遠鏡, フレネルレンズ, telescope, International Space Station, neutrino, ニュートリノ, gamma ray, 大気発光, マルチアノード光電子増倍管, 宇宙線, ガンマ線, airglow, cosmic ray, cosmic ray shower
Abstract

EUSO(Extreme Universe Space Observatory)は10(exp 20)eVを超える極限エネルギー宇宙線を検出するための科学ミッションである。それは宇宙線が地球大気中で作った空気シャワーからの紫外光を観測するこれまでにない超広視野(60度)の望遠鏡である。現在、日欧米の共同でEUSO計画を遂行中であり、将来国際宇宙ステーションに搭載を予定している。, 資料番号: AA0049122067

Published
2005

7. Planning of a balloon experiment toward EUSO Mission

Author

Sakaki, Naoto, Kawasaki, Yoshiya, Ebisuzaki, Toshikazu, Nagano, Motohiko, Shibata, Toru, and Takahashi, Yukihiro

Subjects
エネルギースペクトル, 宇宙線シャワー, EUSO, シンチレーションカウンター, energy spectrum, extremely high energy cosmic ray, detector array, background radiation, 超高エネルギー宇宙線, 検出器アレイ, 背景放射, AGN, cosmic ray shower, scintillation counter
Abstract

資料番号: AA0046651029

Published
2004

8. The Arrival Direction Distribution of Extremely High Energy Cosmic Rays Observed by AGASA

Author

Teshima, Masahiro, Takeda, Masahiro, Chikawa, Michiyuki, Fukushima, Masaki, Hayashida, Naoaki, Honda, Ken, Inoue, Naoya, Kadota, Kenji, Kakimoto, Fumio, Kamata, Kouichi, Kawaguchi, Setsuo, Kawakami, Saburo, Kawasaki, Yoshiya, Kawasumi, Norio, Mase, Keiichi, Mizobuchi, Tomoko, Nagano, Motohiko, Ohoka, Hideyuki, Osone, Satoko, Sakaki, Naoto, Sakurai, Nobuyuki, Sasaki, Makoto, Sasano, Masahiko, Shimizu, Hirohiko, Shinozaki, Kenji, Torii, Reiko, Tsushima, Itsurou, Uchihori, Yukio, Yamamoto, Tokonatsu, Yoshida, Shigeru, and Yoshii, Hisashi

Abstract

Study of the arrival direction distribution plays a key role in finding sources of the Extremely High Energy Cosmic Rays (EHECR). Greisen-Zatsepin-Kuz'min (GZK) mechanism limits the propagation of EHE cosmic rays significantly and only nearby sources can contribute to the local EHECR flux. Furthermore EHECRs travel intergalactic spaces almost linearly. Hence, we expect they can be traced back to their sources. Here we report a small-sacle anisotropy of the arrival direction distribution of EHECRs observed by AGASA above 1019eV . This result strongly suggests the existence of point sources of EHECRs.

Published
2003

9. Energy Determination in the Akeno Giant Air Shower Array Experiment

Author

Takeda, Masahiro, Sakaki, Naoto, Chikawa, Michiyuki, Fukushima, Masaki, Hayashida, Naoaki, Honda, Ken, Inoue, Naoya, Kadota, Kenji, Kakimoto, Fumio, Kamata, Kouichi, Kawaguchi, Setsuo, Kawakami, Saburo, Kawasaki, Yoshiya, Kawasumi, Norio, Mase, Keiichi, Mizobuchi, Tomoko, Nagano, Motohiko, Ohoka, Hideyuki, Osone, Satoko, Sakurai, Nobuyuki, Sasaki, Makoto, Sasano, Masahiko, Shimizu, Hirohiko, Shinozaki, Kenji, Teshima, Masahiro, Torii, Reiko, Tsushima, Itsurou, Uchihori, Yukio, Yamamoto, Tokonatsu, Yoshida, Shigeru, and Yoshii, Hisashi

Subjects
Astrophysics::High Energy Astrophysical Phenomena
Abstract

Using data from more than ten-years of observations with the Akeno Giant Air Shower Array (AGASA), we published that the energy spectrum of ultra-high energy cosmic rays extends beyond the GZK cutoff. We have reevaluated the energy determination method used for AGASA events with respect to various factors. The currently assigned energies of AGASA events have an accuracy of +-25% in event-reconstruction resolution and +-18% in systematic errors around 10^20eV. This systematic uncertainty is independent of primary energy above 10^19eV.

Published
2003

10. Chemical Composition of Ultra-High Energy Cosmic Rays Observed by AGASA

Author

Shinozaki, Kenji, Chikawa, Michiyuki, Fukushima, Masaki, Hayashida, Naoaki, Honda, Ken, Inoue, Naoya, Kadota, Kenji, Kakimoto, Fumio, Kamata, Kouichi, Kawaguchi, Setsuo, Kawakami, Saburo, Kawasaki, Yoshiya, Kawasumi, Norio, Mase, Keiichi, Mizobuchi, Tomoko, Nagano, Motohiko, Ohoka, Hideyuki, Osone, Satoko, Sakaki, Naoto, Sakurai, Nobuyuki, Sasaki, Makoto, Sasano, Masahiko, Shimizu, Hirohiko, Takeda, Masahiro, Teshima, Masahiro, Torii, Reiko, Tsushima, Itsurou, Uchihori, Yukio, Yamamoto, Tokonatsu, Yoshida, Shigeru, and Yoshii, Hisashi

Subjects
Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Experiment
Abstract

We have observed ultra-high energy cosmic rays above the Greisen-Zatsepin-Kuz'min cut-off energy by Akeno Giant Air Shower Array. Their chemical composition is a key discriminator of origin models. In the present work, we estimate the average composition by an analysis of muons in air showers with AIRES+QGSJET simulation. The data matches the prediction for light hadron primaries and no indication has been found for a gamma-ray dominance.

Published
2003

11. UPPER LIMIT ON GAMMA-RAY FLUX ABOVE 1019 eV ESTIMATED BY THE AKENO GIANT AIR SHOWER ARRAY EXPERIMENT

Author

Shinozaki, Kenji, Chikawa, Michiyuki, Fukushima, Masaki, Hayashida, Naoaki, Inoue, Naoya, Honda, Ken, Kadota, Kenji, Kakimoto, Fumio, Kamata, Kouichi, Kawaguchi, Setsuo, Kawakami, Saburo, Kawasaki, Yoshiya, Kawasumi, Norio, Mahrous, A, Mase, Keiichi, Mizobuchi, Tomoko, Morizane, Yuichirou, Nagano, Motohiko, Ohoka, Hideyuki, Osone, Satoko, Sakaki, Naoto, Sakurai, Nobuyuki, Sasaki, Makoto, Sasano, Masahiko, Takeda, Masahiro, Teshima, Masahiro, Tsushima, Itsurou, Torii, Reiko, Uchihori, Yukio, Vazquez, R, Yamamoto, Tokonatsu, Yoshida, Shigeru, and Yoshii, Hisashi

Subjects
Astrophysics::High Energy Astrophysical Phenomena
Abstract

The origin of the highest energy cosmic rays (−1020 eV) is not well understood. Interesting models called ＾top-down￣ scenarios have been proposed to explain the origin. The g-ray flux in ultra?high-energy cosmic rays is a key parameter for giving constraints on such models. To study the properties of g-ray showers, we carry out simulation studies that take into account both the Landau-Pomeranchuk-Migdal effect and electromagnetic interactions in the geomagnetic field. Based on an analysis of muons in air showers observed by the Akeno Giant Air Shower Array, the upper limits on the g-ray flux are estimated to be 28% above 1019 eV and 67% above 1019.5 eV in the observed air showers at a confidence level of 95%. Above 1020 eV, the primary composition is in agreement with an extrapolation from lower energies, and there is no indication that the observed events are mostly g-ray showers. These results provide observational constraints for origin models up to the highest energies.

Published
2002

12. Clusters of Cosmic Rays above 10^19eV observed with AGASA

Author

Takeda, Masahiro, Chikawa, Michiyuki, Fukushima, Masaki, Hayashida, Naoaki, Honda, Ken, Inoue, Naoya, Kadota, Kenji, Kakimoto, Fumio, Kamata, Kouichi, Kawaguchi, Setsuo, Kawakami, Saburo, Kawasaki, Yoshiya, Kawasumi, Norio, Kusano, Erina, Mahrous, A, Mase, Keiichi, Mizobuchi, Tomoko, Morizane, Yuichirou, Nagano, Motohiko, Ohoka, Hideyuki, Osone, Satoko, Sakaki, Naoto, Sakurai, Nobuyuki, Sasaki, Makoto, Sasano, Masahiko, Shinozaki, Kenji, Teshima, Masahiro, Torii, Reiko, Tsushima, Itsurou, Uchihori, Yukio, Yamamoto, Tokonatsu, Yoshida, Shigeru, and Yoshii, Hisashi

Published
2001

13. Properties of EHE gamma-ray initiated air showers and their search by AGASA

Author

Shinozaki, Kenji, Chikawa, Michiyuki, Fukushima, Masaki, Hayashida, Naoaki, Honda, Ken, Inoue, Naoya, Kadota, Kenji, Kakimoto, Fumio, Kamata, Kouichi, Kawaguchi, Setsuo, Kawakami, Saburo, Kawasaki, Yoshiya, Kawasumi, Norio, Kusano, Erina, Mahrous, A, Mase, Keiichi, Mizobuchi, Tomoko, Morizane, Yuichirou, Nagano, Motohiko, Ohoka, Hideyuki, Osone, Satoko, Sakaki, Naoto, Sasaki, Makoto, Sasano, Masahiko, Takeda, Masahiro, Teshima, Masahiro, Torii, Reiko, Tsushima, Itsurou, Uchihori, Yukio, Yamamoto, Tokonatsu, Yasui, Kenji, Yoshida, Shigeru, and Yoshii, Hisashi

Published
2001

14. Energy spectrum above 3 x 10^18 eV observed with AGASA

Author

Sakaki, Naoto, Chikawa, Michiyuki, Fukushima, Masaki, Hayashida, Naoaki, Honda, Ken, Inoue, Naoya, Kadota, Kenji, Kakimoto, Fumio, Kamata, Kouichi, Kawaguchi, Setsuo, Kawakami, Saburo, Kawasaki, Yoshiya, Kawasumi, Norio, Kusano, Erina, Mahrous, A, Mase, Keiichi, Mizobuchi, Tomoko, Morizane, Yuichirou, Nagano, Motohiko, Ohoka, Hideyuki, Osone, Satoko, Sakurai, Nobuyuki, Sasaki, Makoto, Sasano, Masahiko, Shinozaki, Kenji, Takeda, Masahiro, Teshima, Masahiro, Torii, Reiko, Tsushima, Itsurou, Uchihori, Yukio, Yamamoto, Tokonatsu, Yoshida, Shigeru, and Yoshii, Hisashi

Published
2001

15. Muon component in giant air showers with energies greater than 10^18.5eV observed by AGASA

Author

Inoue, Naoya, Chikawa, Michiyuki, Fukushima, Masaki, Hayashida, Naoaki, Honda, Ken, Kadota, Kenji, Kakimoto, Fumio, Kakizawa, Shinichi, Kamata, Kouichi, Kawaguchi, Setsuo, Kawakami, Saburo, Kawasaki, Yoshiya, Kawasumi, Norio, Kusano, Erina, Mahrous, A, Mase, Keiichi, Minagawa, Takahiro, Morizane, Yuichirou, Nagano, Motohiko, Ohoka, Hideyuki, Osone, Satoko, Sakaki, Naoto, Sasaki, Makoto, Sasano, Masahiko, Shinozaki, Kenji, Takeda, Masahiro, Teshima, Masahiro, Torii, Reiko, Tsushima, Itsurou, Uchihori, Yukio, Yamamoto, Tokonatsu, Yasui, Kenji, Yoshida, Shigeru, Yoshii, Hisashi, and Yoshikoshi, Takanori

Published
2001

16. Anisotropy of cosmic-ray arrival direction at 10^18eV observed by AGASA

Author

Chikawa, Michiyuki, Fukushima, Masaki, Hayashida, Naoaki, Honda, Ken, Inoue, Naoya, Kadota, Kenji, Kakimoto, Fumio, Kakizawa, Shinichi, Kamata, Kouichi, Kawaguchi, Setsuo, Kawakami, Saburo, Kawasaki, Yoshiya, Kawasumi, Norio, Kusano, Erina, Mahrous, A, Mase, Keiichi, Minagawa, Takahiro, Morizane, Yuichirou, Nagano, Motohiko, Ohoka, Hideyuki, Osone, Satoko, Sakaki, Naoto, Sasaki, Makoto, Sasano, Masahiko, Shinozaki, Kenji, Takeda, Masahiro, Teshima, Masahiro, Torii, Reiko, Tsushima, Itsurou, Uchihori, Yukio, Yamamoto, Tokonatsu, Yoshida, Shigeru, Yasui, Kenji, Yoshii, Hisashi, and Yoshikoshi, Takanori

Published
2001

17. Energy estimation of AGASA events

Author

Sakaki, Naoto, Chikawa, Michiyuki, Fukushima, Masaki, Hayashida, Naoaki, Honda, Ken, Inoue, Naoya, Kadota, Kenji, Kakimoto, Fumio, Kamata, Kouichi, Kawaguchi, Setsuo, Kawakami, Saburo, Kawasaki, Yoshiya, Kawasumi, Norio, Kusano, Erina, Mahrous, A, Mase, Keiichi, Mizobuchi, Tomoko, Morizane, Yuichirou, Nagano, Motohiko, Ohoka, Hideyuki, Osone, Satoko, Sakurai, Nobuyuki, Sasaki, Makoto, Sasano, Masahiko, Shinozaki, Kenji, Takeda, Masahiro, Teshima, Masahiro, Torii, Reiko, Tsushima, Itsurou, Uchihori, Yukio, Yamamoto, Tokonatsu, Yoshida, Shigeru, and Yoshii, Hisashi

Published
2001

18. EUSOミッション:宇宙からの大気蛍光法による極限エネルギー宇宙線観測

Author

Kajino, Fumiyoshi, Nagano, Motohiko, Ebisuzaki, Toshikazu, Takizawa, Yoshiyuki, Kawasaki, Yoshiya, Sato, Mitsuteru, Bertaina, M. E., Shibata, Toru, Sakaki, Naoto, Inoue, Naoya, 梶野 文義, 永野 元彦, 戎崎 俊一, 滝澤 慶之, 川崎 賀也, 佐藤 光輝, 柴田 徹, 榊 直人, 井上 直也, Kajino, Fumiyoshi, Nagano, Motohiko, Ebisuzaki, Toshikazu, Takizawa, Yoshiyuki, Kawasaki, Yoshiya, Sato, Mitsuteru, Bertaina, M. E., Shibata, Toru, Sakaki, Naoto, Inoue, Naoya, 梶野 文義, 永野 元彦, 戎崎 俊一, 滝澤 慶之, 川崎 賀也, 佐藤 光輝, 柴田 徹, 榊 直人, and 井上 直也

Abstract

EUSO(Extreme Universe Space Observatory)は10(exp 20)eVを超える極限エネルギー宇宙線を検出するための科学ミッションである。それは宇宙線が地球大気中で作った空気シャワーからの紫外光を観測するこれまでにない超広視野(60度)の望遠鏡である。現在、日欧米の共同でEUSO計画を遂行中であり、将来国際宇宙ステーションに搭載を予定している。

Published
2015

19. Fluorescence yields in determination of primary cosmic ray energy

Author

Nagano, Motohiko

Subjects
cosmic, Astrophysics::High Energy Astrophysical Phenomena
Abstract

The experiments on the search for the end of the cosmic ray energy spectrum are summarized. In estimation of the primary cosmic ray energy by the fluorescence technique, the determination of fluorescence yields in air is most important. If the preliminary yield at 337nm by AIRFLY measurement is used for Flys' Eye, HiRes and Auger, the di erences of primary spectra among experiments are within experimental errors of each experiment, including su ace detector array experiment AGASA. In order to establish the energy scale, it is most important to determine the absolute fluorescence yield at 337 nm to understand the optical technique further.

Published
2009

20. Fluorescence yields in determination of primary cosmic ray energy

Author

Nagano,Motohiko and Nagano,Motohiko

Abstract

The experiments on the search for the end of the cosmic ray energy spectrum are summarized. In estimation of the primary cosmic ray energy by the fluorescence technique, the determination of fluorescence yields in air is most important. If the preliminary yield at 337nm by AIRFLY measurement is used for Flys' Eye, HiRes and Auger, the di erences of primary spectra among experiments are within experimental errors of each experiment, including su ace detector array experiment AGASA. In order to establish the energy scale, it is most important to determine the absolute fluorescence yield at 337 nm to understand the optical technique further.

Published
2009

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