arXiv 1111.10492011-11-04nucl-exastro-ph.SR

A=160 r过程丰度峰区的核形变

Nuclear deformations in the region of the A=160 r-process abundance peak

P. -A. Söderström

备注：: 4 pages, 3 figures, submitted to the proceedings of the Nordic Conference on Nuclear Physics 2011
DOI：: 10.1088/0031-8949/2012/T150/014038

摘要：

在r过程核的丰度谱中，最显著的特征是当r过程流通过闭合的中子壳层时形成的峰。然而，丰度谱中还有其他一些特征不能用壳效应解释，比如在质量A=160附近的稀土原子核区域的峰值。有人认为，这一峰值与丰中子同位素的形变最大值有关。近年来，人们对丰中子稀土核的形变和寻找最大形变点进行了实验和理论研究。本工作主要集中在170 Dy附近的核，以了解82 < N < 126的中子壳层中集体性的演化。这些调查将讨论的可变转动惯量模型的哈里斯参数。最后，我们将讨论在新的实验设施中使用放射性核束进一步进入富中子稀土区的可能性。

英文摘要：

In the abundance spectrum of r-process nuclei the most prominent features are the peaks that form when the r-process flow passes through the closed neutron shells. However, there are also other features in the abundance spectrum that can not be explained by shell effects, like the peak in the region of the rare-earth nuclei around mass A=160. It has been argued that this peak is related to the deformation maximum of the neutron-rich isotopes. Recently, both experimental and theoretical work has been carried out to study the deformation of neutron-rich rare-earth nuclei and to search for the point of maximum deformation. This work has focused on the nuclei around 170Dy in order to understand the evolution of collectivity in the neutron shell with 82 < N < 126. These investigations will be discussed in terms of the Harris parameters of the Variable Moment of Inertia model. Finally, we will discuss the future possibilities to reach further into the neutron-rich rare-earth region at the new experimental facilities using radioactive beams.

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