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arXiv 1809.01097nucl-th
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轻核中单个低能E1环形态和压缩态:形变效应、能谱和解释

Individual low-energy E1 toroidal and compression states in light nuclei: deformation effect, spectroscopy and interpretation

V. O. Nesterenko, J. Kvasil, A. Repko, P. -G. Reinhard

摘要:

最近在Skyrme力的准粒子无规相近似(QRPA)框架下预言了$^{24}$ Mg中存在单个的低能E1环形态和压缩态(TS和CS).结果表明,$^{24}$ Mg的强轴向形变是使环向强度向低能区下移的关键,从而使TS成为最低的E1(K=1)偶极态.在这项研究中,我们用简单的平均场参数解释了这一结果。通过比较两个强轴核$^{24}$ Mg和$^{20}$ Ne的TS,我们发现最低TS不是普遍现象,而是$^{24}$ Mg的一个特殊现象。TS和CS的光谱进行了分析,并建议这些国家的一些额外的解释。

英文摘要:

The existence of individual low-energy E1 toroidal and compression states (TS and CS) in $^{24}$Mg was predicted recently in the framework of quasiparticle random-phase-approximation (QRPA) model with Skyrme forces. It was shown that the strong axial deformation of $^{24}$Mg is crucial to downshift the toroidal strength to the low-energy region and thus make the TS the lowest E1(K=1) dipole state. In this study, we explain this result by simple mean-field arguments. Comparing TS in two strongly axial nuclei, $^{24}$Mg and $^{20}$Ne, we show that the lowest TS is not not a universal phenomenon but rather a peculiarity of $^{24}$Mg. The spectroscopy of TS and CS is analyzed and some additional interpretation of these states is suggested.

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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