Development and performance test of a prototype air shower array for search for gamma ray point sources in the very high energy region

M. Amenomori*, H. Nanjo, N. Hotta, I. Ohta, K. Kasahara, To Saito, T. Yuda, K. Mizutani, T. Shirai, N. Tateyama, Shoji Torii, M. Shibata, H. Sugimoto, K. Taira, K. Hibino, F. Kajino, M. Nishizawa, M. Ohnishi, M. Sakata, M. ShimaY. Yamamoto

*この研究の対応する著者

研究成果: Article査読

30 被引用数 (Scopus)

抄録

An air shower array consisting of 16 fast timing detectors and 8 particle density detectors was constructed at Mt Norikura (2780 m above sea level) to see the basic performance and to acquire technical knowledge for an enlarged operation at Tibet in search for extraterrestial point sources emitting very high energy gamma rays (> several times 1013 eV). In particular, we focus on the angular resolution in determining the arrival direction of air showers. When a lead plate of 5 mm thickness (which is close to the optimum one) is placed on each scintillator, the apparent particle number is increased by a factor of ∼1.9 and the angular resolution is improved by ∼1.5 as compared to the no lead plate case. We also performed a detailed Monte Carlo simulation and critically examined the so-called even-odd method which many authors have been using for estimating the angular resolution. It is pointed out that selecting showers in which the core falls inside the array is crucial for getting the high-precision direction. For such contained showers, the present array gives a median angular resolution of 0.80° for proton-induced showers whose median energy is 200 TeV. In the coming Tibet experiment, a median angular resolution better than 0.65° (Eγ/100(TeV))- 1 2 is expected for gamma rays.

本文言語English
ページ(範囲)619-631
ページ数13
ジャーナルNuclear Inst. and Methods in Physics Research, A
288
2-3
DOI
出版ステータスPublished - 1990 3月 15
外部発表はい

ASJC Scopus subject areas

  • 器械工学
  • 核物理学および高エネルギー物理学

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