| Co-Investigator(Kenkyū-buntansha) |
BRAGA J. Instituto de Pesquisas Espacias, Professor, 研究員
DUROUCHOUX P. Saclay Laboratory, Professor, 教授
MICHAELSON P. Stanford University, Professor, 教授
SADOULET B. University of California, Professor, 教授
EDBERG T. University of California, Dr., 助手
CORREA R. Instituto de Pesquisas Espacias, Professor, 気球部主任
WEISKOPF M. NASA-Mershall Flight Center, Professor, 主任研究員
TAKAHASHI Yoshiyuki University of Alabama, Professor, 教授
NOMACHI Masaharu National Laboratory for High Energy Physics, Research Associate, 助手 (90208299)
IKEDA Hirokazu National Laboratory for High Energy Physics, Associate Professor, 助教授 (10132680)
OHTA Shigeo Institute of Space and Astronautical Science, Research Associate, 助手 (90013680)
AKIYAMA Hiromitsu Institute of Space and Astronautical Science, Research Associate, 助手 (80013407)
YAMAGAMI Takamasa Institute of Space and Astronautical Science, Associate Professor, 助教授 (40013718)
YAJIMA Nobuyuki Institute of Space and Astronautical Science, Professor, 教授 (30200489)
TAKAHASHI Tadayuki Graduate School of Science, University of Tokyo, Research Associate, 大学院理学系研究科, 助手 (50183851)
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| Research Abstract |
We have been developing a new hard X-ray/Gamma-ray(40keV - 800keV)detector, Welcome-1. Its characteristic is the low-background counts, which is very important factor of the balloon or satellite-borne detector. The detector utilizes the well-type phoswich counter and the compound-eye configuration. Based on the experience with the Welcome -1 detector launched from Brazil, we have improved the detector. In order to obtain higher sensitivity along the line we have pursued, we have reduced the background by narrowing the opening angle of the detector and replacing the main scintillation detector from GSO to Nal.
We performed the balloon-borne experiment at Sanriku, Japan on June 5, 1993. Dr. Tim Edberg was invited as a co-investigator. We observed Crab Nebuula/Pulsar for three hours. Signal to noise ration at the energy range from 50keV to 150 keV exceeds 1.5 in which the flux from the source is reduced to 1/3 by tghe air-attenuation. This S/N ration is the highest among the hard X-ray detectors launched so far. In order to discuss, the feasibility and possible procedures for the future collaborative balloon campaign, we went abroad and discussed with the chair person at several institutes.
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