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Angular resolution of the Ohya air shower detector |
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| Authors: | K Mitsui T Aoki A Okada Y Ohashi Y Muraki S Shibata I Nakamura H Kojima T Kitamura Y Minorikawa Y Kato T Takahashi S Higashi K Kobayakawa and Y Kamiya |
| Affiliation: | a Institute for Cosmic Ray Research, University of Tokyo, Tokyo 188, Japan b Department of Physics, Nagoya University, Nagoya 464, Japan c Department of Physics, Saitama University, Saitama 338, Japan d Department of Physics, Fujita Gakuen Health University, Aichi 470-11, Japan e Department of Physics, Kinki University, Osaka 577, Japan f Department of Physics, Osaka City University, Osaka 558, Japan g College of Liberal Arts, Kobe University, Kobe 657, Japan h Department of Physics, Aichi Shukutoku University, Aichi-Gun, Nagakute 480-11, Japan |
| Abstract: | Accurate measurements of the total number of muons in an air shower are important for the discrimination of showers produced by astronomical gamma rays from those produced by protons. In order to perform this discrimination, muon detectors with a total area of about 400 m2 have been constructed in the Ohya stone mine. At ground level, scintillation detectors have been distributed for determining the total number of electrons in the air shower. The arrival direction of the air shower determined by usual timing information was examined using independent data on the arrival direction determined by muons in the shower. The angular resolution thus obtained at the shower maximum is 1.7° in the south-north plane and 2° in the east-west plane. The difference of the resolution is due to the asymmetric arrangement of scintillation detectors. |
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