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arXiv 0910.1012nucl-th
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$^{58-62}$ Mn同位素的大尺度壳模型计算

Large scale shell model calculations for odd-odd $^{58-62}$Mn isotopes

P. C. Srivastava, I. Mehrotra

摘要:

在两种不同的模型空间中对奇-奇$^{58-62}$ Mn同位素进行了大尺度壳模型计算。第一组计算已经在全$\it{fp}$壳价空间中进行,其中两个最近导出的$\it{fp}$壳相互作用即GXPF 1A和KB 3G将$^{40}$ Ca处理为核。第二组计算是在${fpg_{9/2}}$价空间中进行的,其中$fpg$相互作用将$^{48}$ Ca处理为核心,并通过允许从0 f $_{7/2}$轨道到质子的上$\it{fp}$轨道和从中子的上$\it{fp}$轨道到0 g $_{9/2}$轨道的总共六个粒子激发来施加截断。对于$^{58}$ Mn中的低激发态,KB 3G和GXPF 1A都预测了良好的结果,并且对于$^{60}$ Mn,KB 3G比GXPF 1A好得多。对于负宇称和高自旋正宇称状态,在两种同位素$fpg$相互作用是必需的。关于$^{62}$ Mn的实验数据很少,因此不可能得出任何明确的结论。需要更多的负宇称态的实验数据来确定0 g $_{9/2}$和更高轨道在富中子Mn同位素中的重要性。

英文摘要:

Large scale shell model calculations have been carried out for odd-odd $^{58-62}$Mn isotopes in two different model spaces. First set of calculations have been carried out in full $\it{fp}$ shell valence space with two recently derived $\it{fp}$ shell interactions namely GXPF1A and KB3G treating $^{40}$Ca as core. The second set of calculations have been performed in ${fpg_{9/2}}$ valence space with the $fpg$ interaction treating $^{48}$Ca as core and imposing a truncation by allowing up to a total of six particle excitations from the 0f$_{7/2}$ orbital to the upper $\it{fp}$ orbitals for protons and from the upper $\it{fp}$ orbitals to the 0g$_{9/2}$ orbital for neutron. For low-lying states in $^{58}$Mn, the KB3G and GXPF1A both predicts good results and for $^{60}$Mn, KB3G is much better than GXPF1A. For negative parity and high-spin positive parity states in both isotopes $fpg$ interaction is required. Experimental data on $^{62}$Mn is sparse and therefore it is not possible to make any definite conclusions. More experimental data on negative parity states is needed to ascertain the importance of 0g$_{9/2}$ and higher orbitals in neutron rich Mn isotopes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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