2004 Fiscal Year Final Research Report Summary
Study of Structures of proton-rich nuclei in the rp-nucleosynthesis process
| Project/Area Number |
13640263
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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 | Chiba University |
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Principal Investigator |
OGAWA Kengo Chiba University, Dept.of Physics, Professor, 理学部, 教授 (40011639)
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| Co-Investigator(Kenkyū-buntansha) |
NAKADA Hitoshi Chiba University, Dept.of Physics, Associate Professor, 理学部, 助教授 (80221448)
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| Project Period (FY) |
2001 – 2004
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| Keywords | proton-rich nuclei / rp-nucleosynthesis process / shell model / isospin / nuclear magnetic property / Hartree-Fock approximation / effective interaction |
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| Research Abstract |
Structures of the proton-rich Nuclei which are contribute to the rp-nucleosynthesis process have been investigated in a frame work of the nuclear shell model and also mean-field theory. In the following we report the major four subjects in this research program.
1.Structure of right proton-rich nuclei and Thomas-Ehrman shifts
The asymmetry in the energy spectra between mirror nuclei (the Thomas-Ehrman shift) around ^<16>O is investigated from a phenomenological point of view. The recent data on proton-rich nuclei indicates that the residual interaction is reduced for loosely bound proton in s-orbit by as much as 30%, which originates in the broad radial distribution of the proton single-particle wave functions.
2.Structure of proton-rich nuclei around N=82
The 10^+ and 272^-isomers of Z>64 and N=82 nuclei are investigated in the shell-model framework. We derive an extended seniority formula for E2 transition strength. Based on the extended formula, as well as on the approximate degeneracy among the Oh_<11/2>,2s_<1/2> and 1d_<3/2> orbits, we argue that B(E2) data require the ^<146>Gd core excitation. The energy levels of both parities and B(E2) values are simultaneously reproduced by a multi-j shell model calculation with MSDI, by taking ito account the excitation of protons from(Og_<7/2>, 1d_<5/2>) core.
3.Mean field approach to proton-rich nuclei
In order to understand the structure of proton-rich nuclei with Hartree-Fock calculation, effective interactions for mean-field theory are carefully reviewed. It is shown that a parameter set called M3Y-P2 describes various properties similarly well to the Skyrme Sly5 and/or Gogny D1S interactions.
4.Developing the nuclear shell model code and its application to related subjects
Based on the jj-coupling scheme, a shell model computer program has been developed and is successively applied to hyper nuclei and also the random interaction problem.
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[Journal Article] A new isomer in ^<136>Ba populated by deep-inelastic collisions2004
Author(s)
T.Shizuma, Z.G.Gan, K.Ogawa, H.Nakada, M.Oshima, Y.Toh, T.Hayakawa, Y.Hatsukwa, M.Sugawara, Y.Utsuno, Z.Liu
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Journal Title
The European Physical Journal A 20
Pages: 207-210
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Analogous Gamow-Teller and M1 transitions in ^<26>Mg,^<26>Al and ^<26>si2003
Author(s)
Y.Fujita, Y.Shimbara, A.F.Lisetskiy, T.Adachi, G.P.A.Ber, P.von Brentano, H.Fujimura, H.Fujita, K.Hatanaka, J.Kamiya
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Journal Title
Physical Review C 67
Pages: 064312
Description
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[Journal Article] Nano-second isomers in neutron-rich nuclei around ^<68>Ni2003
Author(s)
T.Ishii, M.Asai, M.Matsuda, P.Kleinheinz, L.Hou, Hori, A.Makishima, T.Kohno, M.Ogawa, K.Ogawa, H.Nakada
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Journal Title
Proceedings of the 3rd International Conference "Fission and Properties of Neutron-Rich Nuclei"(World Scientific)
Pages: 125
Description
「研究成果報告書概要(欧文)」より
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