抄録
The BETS (balloon-borne electron telescope with scintillating fibers) instrument has been developed for high-altitude balloon flights to observe the cosmic ray electrons with energies of 10 GeV to several 100 GeV. The detector is a Lead/SciFi sampling calorimeter consisting of 36 SciFi belts (each 280 mm wide) and 8 lead plates (each 5 mm thick). The electron identification is performed by triggering the electro-magnetic showers on board and by analyzing the three-dimensional shower images by an intensified CCD camera. It is demonstrated in the flight data in 1995 and 1997 that a reliable identification of the electron component against the proton background is achieved up to a few 100 GeV. The performance of detector was tested by the CERN-SPS electron beams in 1996 and with the proton beams in 1997. The obtained energy spectrum is consistent with the recent observation by HEAT, although our result still has a little room for improvement. The energy spectrum from 10 GeV to 1000 GeV which is obtained by combining these data and the emulsion chamber data ( Nishimura et al. 1997) suggests that the diffusion constant is about 1 × 1028 (E/GeV)0.3 cm2/sec in the energy range between 10 GeV and 1000 GeV. A hump in the energy spectrum is observed around several hundred GeV, which is expected from a nearby source.
本文言語 | English |
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ページ(範囲) | 1823-1826 |
ページ数 | 4 |
ジャーナル | Advances in Space Research |
巻 | 26 |
号 | 11 |
DOI | |
出版ステータス | Published - 2000 12月 |
外部発表 | はい |
ASJC Scopus subject areas
- 宇宙惑星科学
- 天文学と天体物理学