1987 Fiscal Year Final Research Report Summary
Nuclear Magnetic and Gamow-Teller Transitions
| Project/Area Number |
60540168
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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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 | University of Tokyo |
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Principal Investigator |
SHIMIZU Kiyotaka Faculty of Science, University of Tokyo, 理学部, 助手 (00143363)
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| Co-Investigator(Kenkyū-buntansha) |
HYUGA Hiroyuki Faculty of Scieno and Engheering, Keio University, 理工学部, 助教授 (70126150)
YAZAKI Koichi Faculty of Scieno, University of Tokyo, 理学部, 教授 (60012382)
ARIMA Akito Faculty of Scieno, University of Tokyo, 理学部, 教授 (40011465)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Magnetic transition / Gamow / Teller transition / Tensor correlation / Meson exchange currents / Spin-isospin resporse / Coulomb sumrule |
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| Research Abstract |
Study of the nuclear magnetic moments and beta-decay played a very important role in studying nuclear structure and effeetive interactions. Resently a lot of information about magnetic and Gamow-Teller transitions observed in proton and electron scatterings, londitudinal and transverse responses in the quasi-elastic electron scalterings etc. has been obtained. We have studied the effects of core polarization, especially tensor correlations, meson exchange currents, <DELTA>-hole excitations and quark degrees of freedom on the above reactions. In the magnetic and Gamow-teller transitions, it has been known that the transition strengths have been distributed over the high energy excitation regions experimentally. It was, however, very difficult to clarify the mechanism of the distribution theoretically. We have developed the extended modified Rondom Phase Approximation which takes into account the effect of grount state corretlations and exchange currents.
We have also studied the spin-isospin response in the quasi-elastic region. Here the continuum RPA theory has been employed. The method how to include the exchange term has been newly developed. We have obtained the results which are different from other calculations in nuclear matter. We have also applied the continuum RPA with exchange terms on the coulomb sum rule in the electron scattering.
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