High energy primary electron spectrum observed by the emulsion chamberA detector of the emulsion chamber type is used to measure the energy spectrum of cosmic-ray electrons. Two large emulsion chambers, each having an area of 40 by 50 sq cm, are exposed for about 25.5 hr at an average pressure altitude of 3.9 mbar. About 500 high-energy cascades (no less than about 600 GeV) are detected by searching for dark spots on the X-ray films. A power-law energy dependence formula is derived for the spectrum of primary cosmic-ray electrons in the energy region over 100 GeV. The results are in good agreement with the transition curves obtained previously by theoretical and Monte Carlo calculations.
Document ID
19790060598
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Nishimura, J. (Tokyo Univ. Japan)
Fujii, M. (Tokyo, University Tokyo, Japan)
Aizu, H. (Tokyo Univ. Japan)
Hiraiwa, N. (Kanagawa Prefectural College Yokohama, Japan)
Taira, T. (Kanagawa University Yokohama, Japan)
Kobayashi, T. (Aoyama Gakuin University Tokyo, Japan)
Niu, K. (Nagoya University Nagoya, Japan)
Koss, T. A. (Tokyo Univ. Japan)
Lord, J. J. (Washington, University Seattle, Wash., United States)
Golden, R. L. (NASA Johnson Space Center Houston, Tex., United States)