| Project/Area Number |
63041040
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Field Research |
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| Research Institution | University of Tokyo |
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Principal Investigator |
KAMAE Tuneyoshi Faculty of Science, University of Tokyo, Professor, 理学部, 教授 (90011618)
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| Co-Investigator(Kenkyū-buntansha) |
BRAGA Joao Institute de Pesquisas Espacias (INPE), Research Worker, 研究員
NERI Angelo Institute de Pesquisas Espacias (INPE), Research Worker, 研究員
SAKURAI Takahisa NASA-Marshall Space Flight Center, Research Worker, 研究員
CORREA Ricardo Institute de Pesquisas Espacias (INPE), Director of Balloon Group, 気球部長
TAKAHASHI Yoshiyuki Physics Department, University of Alabama, Associate Professor, 物理学科, 助教授
WEISSKOPF M. NASA-Marshall Space Flight Center, Chief Worker, 主任研究員
MURAKAMI Hiroyuki Faculty of Science, Rikkyo University, Research Associate, 理学部, 助手
NAKAGAWA Michio Faculty of Science, Osaka City University, Associate Professor, 理学部, 助教授 (40047238)
WUENSHE Alexandre Institute de Pesquisas Espacias (INPE), Research Worker, 研究員
MOTOBAYASHI Toru Faculty of Science, Rikkyo University, Associate Professor, 理学部, 助教授 (20116114)
TAKAHASHI Tadayuki Faculty of Science, University of Tokyo, Research Associate, 理学部, 助手 (50183851)
ENOMOTO Ryoji National Laboratory for High Energy Physics, Research Associate, 助手 (80183755)
NOMACHI Masaharu National Laboratory for High Energy Physics, Research Associate, 助手 (90208299)
CHIBA Junsei National Laboratory for High Energy Physics, Associate Professor, 助教授 (50126124)
AKIYAMA Hiromitu The Institute of Space and Astronautical Science, Research Associate, 助手 (80013407)
OTA Shigeo The Institute of Space and Astronautical Science, Research Associate, 助手 (90013680)
FUJII Masami The Institute of Space and Astronautical Science, Research Associate, 助手 (20013691)
YAMAGAMI Takamasa The Institute of Space and Astronautical Sciense, Research Associate, 助手 (40013718)
YAJIMA Nobuyuki The Institute of Space and Astronautical Science, Professor, 教授 (30200489)
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| Project Period (FY) |
1988 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥23,000,000 (Direct Cost: ¥23,000,000)
Fiscal Year 1990: ¥9,000,000 (Direct Cost: ¥9,000,000)
Fiscal Year 1989: ¥9,000,000 (Direct Cost: ¥9,000,000)
Fiscal Year 1988: ¥5,000,000 (Direct Cost: ¥5,000,000)
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| Keywords | Balloon-borne experiments / Balloon / SN1987A / Hard X-ray / gammaray detector / Brazil |
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| Research Abstract |
We have carried out balloon-borne experiments in collaboration with the INPE (Institute of Space Research) Brazilian balloon group. The major objectives are to launch large stratospheric balloons and to observe hard X-rays/gamma-rays from astronomical objects such as SN1987A. The detectors were prepared by the japanese group (Univ. of Tokyo, ISAS and others). The launching operation was responsibility of the brazilian side while the radio communication was responsibility of the Japanese group.
In 1988, two balloons were launched from Pocos de Caldas on November 24 and 28. One balloon (5X10^6ft^3) carried the hard X-ray detector (187kg) and the other (20X10^6ft^3) carried the gamma-ray detector (865 Kg).
In the last two years, we moved to the INPE balloon base in Cachoerira Paulista (45 00 34W, 22 39 44S). We have set up a communication facility that allows frequent campaign for several years. Using the facility, we have launched balloons carring our new hard X-rays/gamma rays detector (Welcome1 (Well-type Compound Eye-1, 670kg)).
In 1989, one balloon (6.6X10^6ft^3) was launched on Dec. 22. Unfortunately, due to failure of the electronics in vacuum condition at the ceiling altitude, we could not take scientific data. The star camera system, command system and other equipment, however worked well and gave us technical information on the detector.
In 1990, two balloons (6.6 and 8.8X10^6ft^3) were launched on Nov. 14 and Nov. 29. In the first flight, we could not control the direction of our detector due to failure of the telecommand system and took background data. In the second flight, we succeeded in observing SN1987A for about 4 hours. Data is now under analysis. The background data at the ceiling altitude shows that the sensitivitiesーa few X10^<-6>/cm^2/s/keV and ー10^<-4>/cm^2/s are attained for the continuum spectrum and line spectrum respectively. These values are about 5 times superior to the previous type of detectors used in balloon-borne experiments.
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