Search

Your search keyword '"Kawaguchi, Setsuo"' showing total 13 results
Start Over Author "Kawaguchi, Setsuo"
13 results on '"Kawaguchi, Setsuo"'

1. 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

2. 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

3. 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

4. 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

5. A search for horizontal air showers induced by extremely high energy cosmic neutrinos observed by Akeno Giant Air Shower Array

Author

Yoshida, Shigeru, 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, Mahrous, A, Mase, Keiichi, Mizobuchi, Tomoko, Morizane, Yuichirou, Ohoka, Hideyuki, Osone, Satoko, Sakurai, Nobuyuki, Sasaki, Makoto, Sasano, Masahiko, Shinozaki, Kenji, Takeda, Masahiro, Teshima, Masahiro, Torii, Reiko, Tsushima, Itsurou, Uchihori, Yukio, Yamamoto, Tokonatsu, and Yoshii, Hisashi

Published
2001

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

Catalog

Books, media, physical & digital resources
See catalog results