Unusually penetrating particle detected by balloon-borne emulsion chamber

M. Ichimura, E. Kamioka, M. Kitazawa, T. Kobayashi, T. Shibata, S. Somemiya, M. Kogawa, S. Kuramata, H. Matsutani, T. Murabayashi, H. Nanjyo, Z. Watanabe, H. Sugimoto, K. Nakazawa

研究成果: Article査読

55 被引用数 (Scopus)

抄録

One example of an unusual particle track has been recorded in an emulsion chamber exposed to cosmic rays on a ballon at the atmospheric depth 11.7 g/cm2. The particle arrived at the chamber with Z/β=40±2 and β≳0.8. What is extraordinary with this particle is its arrival zenith angle, 87.4°, which amounts to a traversed atmospheric thickness ∼200 g/cm2. The anomalous nature of the present track "ET" (exotic track) is demonstrated through the difficulties in reconciling it with the explanation that it is due to an ordinary ultra-heavy cosmic-ray nucleus.

本文言語English
ページ(範囲)843-852
ページ数10
ジャーナルIl Nuovo Cimento A
106
6
DOI
出版ステータスPublished - 1993 6 1
外部発表はい

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 核物理学および高エネルギー物理学
  • 天文学と天体物理学

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