Grant-in-Aid for Overseas Scientific Survey.
|Research Institution||The Institute of Physical and Chemical Research (RIKEN)|
KOHNO Tsuyoshi Cosmic Radiation Laboratory, RIKEN, 宇宙放射線研究室, 研究員 (60211231)
加藤 博 理化学研究所, 研究基盤技術部, 技師
宗像 一起 信州大学, 理学部・物理学教室, 助手 (40221618)
今井 喬 理化学研究所, 宇宙放射線研究室, 技師
松岡 勝 理化学研究所, 宇宙放射線研究室, 主任研究員 (30013668)
CRAWFORD H.J Spase Science Lab.UC Barkeley
MUNAKATA Kazuoki Fuculty of Science, Shinshu University
KATO Hiroshi Technical Division, RIKEN
MATSUOKA Masaru Cosmic Radiation Laboratory, RIKEN
IMAI Takashi Cosmic Radiation Laboratory, RIKEN
CRAWFORD H. J. Space Sciences Laboratory, UC Berkeley
|Project Fiscal Year
1990 – 1991
Completed(Fiscal Year 1991)
|Budget Amount *help
¥4,500,000 (Direct Cost : ¥4,500,000)
Fiscal Year 1991 : ¥2,500,000 (Direct Cost : ¥2,500,000)
Fiscal Year 1990 : ¥2,000,000 (Direct Cost : ¥2,000,000)
|Keywords||cosmic ray / heavy ions / solid state detector / position sensitive detector / isotope / space observation / 宇宙線 / 重イオン / 半導体検出器 / 位置検出器 / アイソト-プ / 宇宙観測|
We have a program for observation of cosmic ray heavy ions at the synchronous orbit. The detectors being employed in this observation are all silicon solid state detectors for both of position sensitive detectors and energy detectors. The energy ranges of our observation are 30 - 140 MeV/nuc for C and 55 - 340 MeV/nuc for Fe. Elemental interval being observed ranges from Li to Ni. The typical geometric factor of the telescope is about 25 cm^2 sterad. This telescope will be launched into synchronous orbit in 1993 aboard the satellite sixth Engineering Test Satellite (ETS-VI).
It is necessary to calibrate the telescope system using heavy ion beams from heavy ion accelerator. The BEVALAC of Lawrence Berkeley Laboratory has long been used for space sciences by NASA, as a cosmic ray source in the laboratory. Useful facilities such as magnetic momentum analyzer system, numerous selection of combinations of targets and absorbers for nuclear fragmentation and energy degradation are equipped there.
Our beam experiment based supported by this budget were done for two years of 1990 and 1991. Both measurements for the Heavy Ion Telescope (HIT) were performed using Fe beams from BEVALAC.
It was confirmed that HIT can clearly separate elements from S to Mn produced by the projectile fragmentation process induced by Fe^<56> beam. The isotopic separation could also be observed for the elements lighter than Ti. The mass resolution was found to be 0.52 amu, 0.60 amu, and 0.72 amu for Ar, Ca and Ti, respectively. We can conclude that the telescope (HIT) has an ability to make good enough observation in space.