TY - JOUR
T1 - New measurement of the electron flux from 10 gev to 100 gev with the bets instrument
AU - Torii, S.
AU - Tamura, T.
AU - Tateyama, N.
AU - Yoshida, K.
AU - Yamagami, T.
AU - Kamioka, E.
AU - Saito, Y.
AU - Murakami, H.
AU - Kobayashi, T.
AU - Komori, Y.
AU - Kasahara, K.
AU - Yuda, T.
AU - Nishimura, J.
N1 - Funding Information:
We are indebted to the crew of the Sanrlku Balloon Center, ISAS for the successful balloon fight We expresss mcere thanks to the techmcal staffs m Kanagawa Umverslty for their helps m manufacturing of the detector This work 1sp artially supported by Grants-m-Aid for Scientific Research (A)
PY - 2000/12
Y1 - 2000/12
N2 - 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 × 10 28 (E/GeV) 0.3 cm 2 /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.
AB - 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 × 10 28 (E/GeV) 0.3 cm 2 /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.
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U2 - 10.1016/S0273-1177(99)01229-6
DO - 10.1016/S0273-1177(99)01229-6
M3 - Article
AN - SCOPUS:6644223697
VL - 26
SP - 1823
EP - 1826
JO - Life sciences and space research
JF - Life sciences and space research
SN - 0273-1177
IS - 11
ER -