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arXiv 0802.2608nucl-th
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~(132)Sn奇异核的壳模型研究

Shell-model studies on exotic nuclei around 132Sn

L. Coraggio, A. Covello, A. Gargano, N. Itaco, T. T. S. Kuo

摘要:

132 Sn周围奇异核的研究是当前实验和理论研究的热点。由于新的先进设施和技术,132 Sn附近的核的实验信息,长期以来一直无法进行光谱研究,现在可以获得。这些丰中子核的现有实验数据可能表明壳层结构发生了变化。事实上,它们与人们通过外推现有的N<82的结果所期望的结果有些不同,作为一种可能的解释,单质子能级方案的变化已经被提出。后者可能是由更弥散的核表面引起的,并且可以被看作是在更大的中子过剩时应该出现的主要效应的前兆。因此,新的数据提供了机会,以测试壳模型,并寻找一个可能的演变壳结构时,走向中子滴线。这刺激了该地区的壳模型研究。在这里,我们提出了一个概述最近的壳模型研究132 Sn邻居,关注那些计算采用现实的有效相互作用。

英文摘要:

The study of exotic nuclei around 132Sn is a subject of current experimental and theoretical interest. Experimental information for nuclei in the vicinity of 132Sn, which have been long inaccessible to spectroscopic studies, is now available thanks to new advanced facilities and techniques. The experimental data which have been now become available for these neutron-rich nuclei may suggest a modification in the shell structure. They are, in fact, somewhat different from what one might expect by extrapolating the existing results for N<82, and as a possible explanation a change in the single-proton level scheme has been suggested. The latter would be caused by a more diffuse nuclear surface, and could be seen as a precursor of major effects which should show up at larger neutron excess. New data offer therefore the opportunity to test the shell model and look for a possible evolution of shell structure when going toward neutron drip line. This is stimulating shell-model studies in this region. Here, we present an overview of recent shell-model studies of 132Sn neighbors, focusing attention on those calculations employing realistic effective interactions.

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