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

doi:10.1007/BF02771498

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

Research output: Contribution to journal › Article › peer-review

58 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	843-852
Number of pages	10
Journal	Il Nuovo Cimento A
Volume	106
Issue number	6
DOIs	https://doi.org/10.1007/BF02771498
Publication status	Published - 1993 Jun 1
Externally published	Yes

Keywords

Cosmic rays
Other and hypothetical particles (including tachyons)

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Nuclear and High Energy Physics
Astronomy and Astrophysics

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10.1007/BF02771498

Cite this

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AU - Ichimura, M.

AU - Kamioka, E.

AU - Kitazawa, M.

AU - Kobayashi, T.

AU - Shibata, T.

AU - Somemiya, S.

AU - Kogawa, M.

AU - Kuramata, S.

AU - Matsutani, H.

AU - Murabayashi, T.

AU - Nanjyo, H.

AU - Watanabe, Z.

AU - Sugimoto, H.

AU - Nakazawa, K.

PY - 1993/6/1

Y1 - 1993/6/1

N2 - 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.

AB - 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.

KW - Cosmic rays

KW - Other and hypothetical particles (including tachyons)

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Unusually penetrating particle detected by balloon-borne emulsion chamber

Abstract

Keywords

ASJC Scopus subject areas

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