Possibility of screen-type X-ray film for observation of heavy cosmic-ray primaries

Masakatsu Ichimura, Eiji Kamioka, Motoyasu Kitazawa, Keisuke Kirii, Tadashi Kobayashi, Toru Shibata, Masataka Kogawa, Shuichi Kuramata, Hideya Matsutani, Takayuki Murabayashi, Hirotada Nanjyo, Zenjiro Watanabe, Hisahiko Sugimoto, Kazuma Nakazawa

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

This article discusses the possibility of screen-type X-ray film for the observation of heavy cosmic-ray primaries. We investigate in detail the optical characteristics of the intensifying screen Gd2O2S:Tb, and perform a simulation calculation for three-dimensional diffusion of scintillation light emitted from numerous δ-rays (knockon electrons produced by a heavy primary) in the screen. On the basis of these theoretical speculations, we report the experimental results obtained recently by a balloon-borne emulsion chamber with full use of the screen type X-ray film, focusing to the charge resolution of heavy primaries and their flux with energy larger than the rigidity cutoff at Sanriku latitude, Ec∼ 4 GeV/n. All results show that the emulsion chamber with multilayered screen-type X-ray film is quite valid and powerful for the observation of heavy cosmic-ray primaries.

Original languageEnglish
Pages (from-to)374-394
Number of pages21
JournalNuclear Inst. and Methods in Physics Research, A
Volume300
Issue number2
DOIs
Publication statusPublished - 1991 Jan 15

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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    Ichimura, M., Kamioka, E., Kitazawa, M., Kirii, K., Kobayashi, T., Shibata, T., Kogawa, M., Kuramata, S., Matsutani, H., Murabayashi, T., Nanjyo, H., Watanabe, Z., Sugimoto, H., & Nakazawa, K. (1991). Possibility of screen-type X-ray film for observation of heavy cosmic-ray primaries. Nuclear Inst. and Methods in Physics Research, A, 300(2), 374-394. https://doi.org/10.1016/0168-9002(91)90451-U