| Project/Area Number |
09640369
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
素粒子・核・宇宙線
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| Research Institution | UNIVERSITY OF AIZU |
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Principal Investigator |
SAGAWA Hiroyuki University of Aizu School of Computer Science and Engineering, Professor, コンピュータ理工学部, 教授 (50178589)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1999: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1998: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1997: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Keywords | Drip Line Nuclei / Giant Resonances / Effectine Charges / Gamow Teller State / Isobaric Gnalogue States / ハロー原子核 / スキン原子核 / ピグミー共鳴 / 相対論的平均場近似 / スピン軌道力 / ガモフ、テラー状態 |
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| Research Abstract |
In this project, the following terms have been studied intensively :
1) proton-neutron RPA response function and excited states in skin nuclei.
The existence of thick skin has been observed in He-isotopes and A=20 isobars. In these nuclei, one-body field is very different from those of stable nuclei. For example, the radial dependence of the one-body potential is different from that of Woods-Saxon potential and rather close to harmonic oscillator one. In this study, the response of drip line nuclei ^<24>O, ^<48>Ni and ^<60>Ca have been studied especially focusing on the threshold strength.
2) Pigmy resonances and Giant resonances in drip line nuclei We have studied dipole states of oxygen-isotopes in large scale shell model calculations. The calculated photoreaction cross sections in ^<16>O and ^<18>O give reasonable agreement with experimental observations both in the low energy region below hω=15 MeV and in the high energy giant resonance region (15 MeV<hω【less than or equal】30 MeV).
3) Isospin violation and restoration in thermal compound systems
Explicit relations between the isospin mixing probability, the spreading width Γ^↓_<IAS> of the Isobaric Analog State (IAS) and the statistical decay width Γ_c of the compound nucleus at finite excitation energy, are derived by using the Feshbach projection.
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