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A new probe of neutron skin thickness

ISSN号：1674-1137
期刊名称：Chinese Physics C
时间：2011.6
页码：555-560
分类：O571.21[理学—粒子物理与原子核物理;理学—物理] P145.6[天文地球—天体物理;天文地球—天文学]
作者机构：[1]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China, [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China
相关基金：Supported by National Natural Science Foundation of China （10775168 10775167 10979074 10747163 11035009）; Major State Basic Research Development Program in China （2007CB815004）; Shanghai Development Foundation for Science and Technology （09JC1416800）
相关项目：基于STAR-TOF探测器上的能量扫描和强相互作用性质的实验研究

关键词：中子皮厚度, 非对称核物质状态方程, 量子分子动力学模型, IQMD模型, 探测, 密度分布, 液滴模型, 丰中子核, IQMD, neutron-to-proton yield ratio, neutron skin thickness

中文摘要：

The correlation between neutron-to-proton yield ratio (Rnp) and neutron skin thickness (δnp) in neutron-rich projectile induced reactions is investigated within the framework of the Isospin-Dependent Quantum Molecular Dynamics (IQMD) model. The density distribution of the Droplet model is embedded in the initialization of the neutron and proton densities in the present IQMD model. By adjusting the diffuseness parameter of neutron density in the Droplet model for the projectile, the relationship between the neutron skin thickness and the corresponding Rnp is obtained. The results show strong linear correlation between Rnp and δnp for neutron-rich Ca and Ni isotopes. It is suggested that Rnp may be used as an experimental observable to extract δnp for neutron-rich nuclei, which is very interesting in the study of the nuclear structure of exotic nuclei, the equation of state (EOS) of asymmetric nuclear matter and neutron-rich matter in astrophysics, etc.

英文摘要：

The correlation between neutron-to-proton yield ratio （Rnp） and neutron skin thickness （δnp） in neutron-rich projectile induced reactions is investigated within the framework of the Isospin-Dependent Quantum Molecular Dynamics （IQMD） model. The density distribution of the Droplet model is embedded in the initialization of the neutron and proton densities in the present IQMD model. By adjusting the diffuseness parameter of neutron density in the Droplet model for the projectile, the relationship between the neutron skin thickness and the corresponding Rnp is obtained. The results show strong linear correlation between Rnp and δnp for neutron-rich Ca and Ni isotopes. It is suggested that Rnp may be used as an experimental observable to extract δnp for neutron-rich nuclei, which is very interesting in the study of the nuclear structure of exotic nuclei, the equation of state （EOS） of asymmetric nuclear matter and neutron-rich matter in astrophysics, etc.