奇异Ne和Mg同位素的巨大核表面扩散
Enormous nuclear surface diffuseness in the exotic Ne and Mg isotopes
摘要：
奇异核的密度剖面可以作为核表面信息的丰富来源。特别地，核表面扩散参数与不清晰核轨道的核子，特别是低角动量核子的占据几率有关。本文的目的是研究在尖点和反转岛内部富中子Ne和Mg同位素的光谱信息与核表面扩散之间的关系。我们使用微观反对称分子动力学模型来计算这些密度和其他光谱信息。一个两参数的费米密度分布，然后用来定义的扩散参数。为了将它们与可观测量联系起来，我们计算了核子-核弹性散射微分截面，要求它们再现第一个峰的位置和大小。从N=19开始，在Ne和Mg同位素中注意到pf轨道中中子占据的显着增加。我们观察到，核扩散与核形变密切相关，在反转岛，并逐渐增加的1 p ~（3/2）轨道的中子占领。这一结果也证实了单粒子估计的价中子密度分布。35- 37 Mg是一个例外，其中sd壳层中的孔的填充部分地补偿了由于填充1 p3/2轨道而增加的扩散。通过研究核子-核弹性散射微分截面的第一衍射峰，可以可靠地提取丰中子中等质量核的核密度剖面信息。Ne和Mg同位素的巨大表面扩散，在反转的岛屿，可以归因于1 p 3/2轨道的中子占领的增加。
英文摘要：
The density profile of exotic nuclei can be a rich source of information on the nuclear surface. In particular, the nuclear surface diffuseness parameter is correlated with the occupation probability of nucleons indistinct nuclear orbits, especially those with low angular momenta. The aim of this paper is to investigate the relationship between the nuclear surface diffuseness and spectroscopic information of neutron rich Ne and Mg isotopes both at the cusp and inside the island of inversion. We use the microscopic antisymmetrized molecular dynamics model to calculate these densities and other spectroscopic information. A two-parameter Fermi density distribution is then used to define the diffuseness parameter. To relate them with observables, the nucleon-nucleus elastic scattering differential cross section is calculated with the demand that they reproduce the first peak position and its magnitude. A marked increase in the occupation of neutrons in the pf-orbit is noted in Ne and Mg isotopes from N=19 onwards. We observed that the nuclear diffuseness is strongly correlated with the nuclear deformation, in the island of inversion, and gradually increases with the occupation of neutrons in the 1p3/2 orbit. This result is also confirmed by a single-particle estimate of the valence neutron density distribution. An exception is noted for 35-37Mg, where the filling up of the holes in the sd-shell partially compensates the increase in diffuseness due to filling up of the 1p3/2 orbit. Information on nuclear density profile of neutron rich medium mass nuclei can be reliably extracted by studying the first diffraction peak of the nucleon-nucleus elastic scattering differential cross section. The enormous surface diffuseness of Ne and Mg isotopes, in the island of inversion, could be attributed to the increasing neutron occupation of the 1p3/2 orbit.
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