| Project/Area Number |
03452022
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
核・宇宙線・素粒子
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| Research Institution | Osaka University |
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Principal Investigator |
SHIMODA Tadashi Osaka University. College of General Education. Associate Professor, 教養部, 助教授 (70135656)
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| Co-Investigator(Kenkyū-buntansha) |
MIYATAKE Hiroari Osaka University. College of General Education. Research Associate, 教養部, 助手 (50190799)
FUJITA Yoshitaka Osaka University, College of General Education. Research associate, 教養部, 助手 (60093457)
MORINOBU Shunpei Kyushu University. Faculty of Science. Professor, 理学部, 教授 (50016078)
TAKAHASHI Noriaki Osaka University. College of General Education. Professor, 教養部, 教授 (10028152)
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| Project Period (FY) |
1991 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1992: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1991: ¥5,700,000 (Direct Cost: ¥5,700,000)
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| Keywords | Nuclei Far From The Stability / Secondary Beam / Elastic Scattering / Inelastic Scattering / Optical Potential / Energy Degrader / Achromatic Beam / Monochromatic Beam |
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| Research Abstract |
Study of interaction potentials between complex nuclei have brought us fruitful information on both nuclear structure and reaction mechanism. We have opened up a systematic study of the interaction potentials associated with unstable nuclei by measuring the elastic and inelastic cross sections induced by beams of unstable nuclei. We have designed and constructed a new facility "secondary-beam line" which delivers unstable nuclear beams. The facility is to be used with high energy heavy-ion beams from the new cyclotron at the Research Center for Nuclear Physics at Osaka University. Our secondary-beam line takes advantage of A- and Z- dependence of the energy loss of ions in matter (energy degrader). and enables us to obtain the reaction products in the form of a secondary beam. Ion-optical consideration has been made for the separator by treating the degrader as one of the ion-optical elements. By this new treatment it has been made possible to optimize the optics of the system accordin
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g to experimental requirements. We have investigated the methods (i) to achieve an achromatic focusing of the secondary beams and (ii) to obtain beams with small energy spread. Based on the design study. the secondary-beam line has been constructed by the end of FY1192. The performance of the beam line has been successfully tested with 300 MeV alpha beam in February 1992. the new cyclotron is still under tuning for light-ion beams. Although heavy-ion beams which are inevitable for our experiments have not yet been accelerated. they will be injected into our beam line hopefully in early summer of 1993. A detector system with large solid angle and high energy and position resolutions has been constructed. The detector system consists of 12 strip position sensitive Si-DELTAW detector and CsI(TI)-E detector. Compact pre-amplifies system has also been designed to cope with a large number of signals from the detector system; the number of the amplifies are 50 typically. The detector system showed satisfactory performance in an on-line test with low energy heavy-ion beams. In summary we have constructed the secondary-beam line which delibers beams of unstable nuclei. and we are ready to investigate the elastic and inelastic scatterings induced by unstable nuclear beams. Less
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