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arXiv 1209.5583nucl-th
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富中子碳同位素中壳层的演化:中子-中子关联的意外增强作用

Shell evolution in neutron-rich carbon isotopes: Unexpected enhanced role of neutron-neutron correlation

Cenxi Yuan, Chong Qi, Furong Xu

摘要:

用全壳模型对角化方法研究了$^{20}$ C周围丰中子核的结构。我们详细研究了C,N和O同位素中N=14壳层演化过程中有效相互作用的不同组分所起的作用。结果表明,与O同位素相比,C和N同位素的N=14壳层能隙的减小与中子-中子相互作用项$V^{nn}_{d_{5/2}d_{5/2}}$和$V^{nn}_{s_{1/2}s_{1/2}}$有关.这个出乎意料的大效应的起源,这是可比的(有时甚至大于)所造成的质子-中子相互作用,是有关的增强组态混合在这些核由于多体相关。最近测量的核$^{20}$ C中的大B(E2)值也支持这种方案。

英文摘要:

Full shell-model diagonalization has been performed to study the structure of neutron-rich nuclei around $^{20}$C. We investigate in detail the roles played by the different monopole components of the effective interaction in the evolution of the N=14 shell in C, N and O isotopes. It is found that the relevant neutron-neutron monopole terms, $V^{nn}_{d_{5/2}d_{5/2}}$ and $V^{nn}_{s_{1/2}s_{1/2}}$, contribute significantly to the reduction of the N=14 shell gap in C and N isotopes in comparison with that in O isotopes. The origin of this unexpectedly large effect, which is comparable with (sometimes even larger than) that caused by the proton-neutron interaction, is related to the enhanced configuration mixing in those nuclei due to many-body correlations. Such a scheme is also supported by the large B(E2) value in the nucleus $^{20}$C which has been measured recently.

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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