TY - JOUR
T1 - Observations of high-energy electrons with the bets intrument and the future prospects
AU - Torii, S.
AU - Tamura, T.
AU - Tateyama, N.
AU - Yoshida, K.
AU - Ouchi, T.
AU - Nishimura, J.
AU - Yamagami, T.
AU - Saito, Y.
AU - Murakami, H.
AU - Kobayashi, T.
AU - Komori, Y.
AU - Kasahara, K.
AU - Yuda, T.
N1 - Funding Information:
ACKNOWLEDGMENTS We express sincere thanks to the launch crew of the Sanriku Balloon Center in the Institute of Space and Astronautical Science for the successful balloon flights. We thank also to Dr. S.Suzuki, Prof.P.Picchi, Prof.L.Periale for their supports at CERN in the beam tests. We gratefully acknowledge assistance from Dr. L.Gatignon and the technical staffs at the X5 beam line of SPS at CERN. This work was supported by Grants-in-Aid for Scientific Research(A,B) and International Scientific Research, the Ministry of Education, Science, Sports and Culture.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2002
Y1 - 2002
N2 - We have developed the balloon-borne electron telescope with scintillating fibers (BETS) for the observation of cosmic-ray electrons in 10 -100 GeV. The detector is an imaging calorimeter consisting of the scintillating-fiber belts of 36 layers (each 280 mm wide) and the 8 plates of lead (each 5mm thick). The rejection of the background protons was performed with an efficiency of ~2000 using the shower imaging capability with high granulation. The balloon observations were carried out in 1997 and in 1998 at Sanriku Balloon Center (ISAS) in Japan. The observed electron flux is consistent around a few 10 GeV with the recent results reported by the HEAT group. Comparing the flux with theoretical expectations by a diffusion model, the best fit is obtained for the model of a diffusion coefficient of 2 × 10 28 (E/GeV) 0 .3 cm 2 /sec in the SN rate of once per 30 years in the Galaxy. In January, 2003, a newly-developed scintillating fiber detector will be borne on the Polar Patrol Balloon (PPB) in Antarctica and exposed for 30 days to the cosmic radiations. We can increase the statistics of electron number in 10-1000 GeV by 10 times comparing to the present data.
AB - We have developed the balloon-borne electron telescope with scintillating fibers (BETS) for the observation of cosmic-ray electrons in 10 -100 GeV. The detector is an imaging calorimeter consisting of the scintillating-fiber belts of 36 layers (each 280 mm wide) and the 8 plates of lead (each 5mm thick). The rejection of the background protons was performed with an efficiency of ~2000 using the shower imaging capability with high granulation. The balloon observations were carried out in 1997 and in 1998 at Sanriku Balloon Center (ISAS) in Japan. The observed electron flux is consistent around a few 10 GeV with the recent results reported by the HEAT group. Comparing the flux with theoretical expectations by a diffusion model, the best fit is obtained for the model of a diffusion coefficient of 2 × 10 28 (E/GeV) 0 .3 cm 2 /sec in the SN rate of once per 30 years in the Galaxy. In January, 2003, a newly-developed scintillating fiber detector will be borne on the Polar Patrol Balloon (PPB) in Antarctica and exposed for 30 days to the cosmic radiations. We can increase the statistics of electron number in 10-1000 GeV by 10 times comparing to the present data.
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U2 - 10.1016/S0273-1177(02)00543-4
DO - 10.1016/S0273-1177(02)00543-4
M3 - Article
AN - SCOPUS:6444245113
VL - 30
SP - 1273
EP - 1282
JO - Life sciences and space research
JF - Life sciences and space research
SN - 0273-1177
IS - 5
ER -