Secondary electron spectrum in the upper atmosphere

Y. Komori, T. Kobayashi, Kenji Yoshida, J. Nishimura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

The secondary electron spectrum in the upper atmosphere(< 10 g/cm 2) is investigated on the basis of the atmospheric gamma ray spectrum above 30 GeV obtained from our emulsion chamber experiments at balloon altitudes. We have to subtract these electrons produced by nuclear interactions from observed electrons to get the primary electron spectrum in the Galaxy. Thus it is required to precise estimates of secondary electron abundance. Both electron and gamma ray intensities are simultaneously solved using the one-dimensional cascade shower theory plus gamma ray production rate derived from observed data. Secondary electrons increases qualitatively as the depth squared. The secondary spectrum has the same index as atmospheric gamma ray index -2.73, namely proton index, while the primary electron index is rather steeper than that. Therefore the ratio of secondary to primary electrons rapidly increases in the TeV region, and the high altitude is essential for TeV electron experiments.

Original languageEnglish
Title of host publicationProceedings of the 30th International Cosmic Ray Conference, ICRC 2007
PublisherUniversidad Nacional Autonoma de Mexico
Pages11-14
Number of pages4
Volume2
EditionOG PART 1
Publication statusPublished - 2007
Event30th International Cosmic Ray Conference, ICRC 2007 - Merida, Yucatan
Duration: 2007 Jul 32007 Jul 11

Other

Other30th International Cosmic Ray Conference, ICRC 2007
CityMerida, Yucatan
Period07/7/307/7/11

Fingerprint

upper atmosphere
electrons
gamma rays
nuclear interactions
gamma ray spectra
balloons
high altitude
showers
emulsions
rays
cascades
chambers
galaxies
protons

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Komori, Y., Kobayashi, T., Yoshida, K., & Nishimura, J. (2007). Secondary electron spectrum in the upper atmosphere. In Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007 (OG PART 1 ed., Vol. 2, pp. 11-14). Universidad Nacional Autonoma de Mexico.

Secondary electron spectrum in the upper atmosphere. / Komori, Y.; Kobayashi, T.; Yoshida, Kenji; Nishimura, J.

Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007. Vol. 2 OG PART 1. ed. Universidad Nacional Autonoma de Mexico, 2007. p. 11-14.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Komori, Y, Kobayashi, T, Yoshida, K & Nishimura, J 2007, Secondary electron spectrum in the upper atmosphere. in Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007. OG PART 1 edn, vol. 2, Universidad Nacional Autonoma de Mexico, pp. 11-14, 30th International Cosmic Ray Conference, ICRC 2007, Merida, Yucatan, 07/7/3.
Komori Y, Kobayashi T, Yoshida K, Nishimura J. Secondary electron spectrum in the upper atmosphere. In Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007. OG PART 1 ed. Vol. 2. Universidad Nacional Autonoma de Mexico. 2007. p. 11-14
Komori, Y. ; Kobayashi, T. ; Yoshida, Kenji ; Nishimura, J. / Secondary electron spectrum in the upper atmosphere. Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007. Vol. 2 OG PART 1. ed. Universidad Nacional Autonoma de Mexico, 2007. pp. 11-14
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