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Study of Structures of proton-rich nuclei in the rp-nucleosynthesis process

rp-核合成过程中富质子核结构的研究

基本信息

批准号：
13640263
负责人：
OGAWA Kengo
金额：
$ 2.24万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2004
项目状态：
已结题

项目摘要

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 shiftsThe 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=82The 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 nucleiIn 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 subjectsBased 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.

在核壳层模型和平均场理论的框架下，研究了对rp核合成过程有贡献的丰质子核的结构。1.右丰质子核的结构和Ehrman位移从唯象的角度研究了^ O周围镜核能谱的不对称性（Ehrman位移）<16>。丰质子核的最新数据表明，松束缚质子在s轨道上的剩余相互作用减少了30%，这是由于质子单粒子波函数的径向分布较宽。2. N= 82丰质子核的结构在壳模型框架下研究了Z>64和N=82的10^+和272^-同分异构体。我们推导出一个扩展的资历公式E2过渡强度。根据推广的公式，以及Oh_（11/2）、2s_（1/2）和1d_（3/2）轨道之间的近似简并，我们认为B（E2）数据需要^<146>Gd核激发。在考虑（Og_<7/2>，1d_<5/2>）核质子激发的情况下，用多j壳模型计算了宇称和B（E2）的能级，并用MSDI方法同时再现了两个宇称的能级和B（E2）值。结果表明，一个称为M_3 Y-P_2的参数集能很好地描述Skyrme Sly_5和/或Gogny D_1S相互作用的各种性质。4.核壳模型程序的开发及其在相关课题中的应用基于jj耦合方案，开发了壳模型程序，并成功地应用于超核和随机相互作用问题。