中国物理B ›› 2008, Vol. 17 ›› Issue (4): 1216-1222.doi: 10.1088/1674-1056/17/4/011

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A possible experimental observable for the determination of neutron skin thickness

方德清1, 马余刚1, 蔡翔舟1, 郭威1, 田文栋1, 王宏伟1, 马春旺2, 傅瑶2   

  1. (1)Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P. O. Box 800-204, Shanghai 201800, China; (2)Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P. O. Box 800-204, Shanghai 201800, China ^b)Graduate School of Chinese Academy of Sciences, Beijing 100039, China
  • 收稿日期:2007-07-28 修回日期:2007-11-19 出版日期:2008-04-20 发布日期:2008-04-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10775168, 10405032, 10535010, 10405033, 10605036 and 10475108), the Shanghai Development Foundation for Science and Technology (Grant Nos 06QA14062, 06JC14082 and 05XD14021),

A possible experimental observable for the determination of neutron skin thickness

Ma Chun-Wang(马春旺)a)b), Fu Yao(傅瑶)a)b), Fang De-Qing(方德清)a)†,Ma Yu-Gang(马余刚)a), Cai Xiang-Zhou(蔡翔舟)a), Guo Wei(郭威)a),Tian Wen-Dong(田文栋)a), and Wang Hong-Wei(王宏伟)a)   

  1. a Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P. O. Box 800-204, Shanghai 201800, China; b Graduate School of Chinese Academy of Sciences, Beijing 100039, China
  • Received:2007-07-28 Revised:2007-11-19 Online:2008-04-20 Published:2008-04-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10775168, 10405032, 10535010, 10405033, 10605036 and 10475108), the Shanghai Development Foundation for Science and Technology (Grant Nos 06QA14062, 06JC14082 and 05XD14021),

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摘要： The dependence between neutron skin thickness and neutron abrasion cross section ($\sigma_{\rm nabr}$) for neutron-rich nuclei is investigated within the framework of the statistical abrasion ablation model. Assuming that the density distributions for proton and neutron are of Fermi-type, and adjusting the diffuseness parameter of neutron density distribution in the droplet model, we find out the good linear correlation between the neutron skin thickness and the abrasion cross section $\sigma_{\rm nabr}$ for neutron-rich nuclei. The uncertainty of neutron skin thickness determined from $\sigma_{\rm nabr}$ is very small. It is suggested that $\sigma_{\rm nabr}$ can be used as a new experimental observable to extract the neutron skin thickness for neutron-rich nucleus. The scaling behaviours between neutron skin thickness and $\sigma_{\rm nabr}$, separately, for isotopes of $^{26-35}$Na, $^{44-56}$Ar, $^{48-60}$Ca, $^{67-78}$Ni are also investigated.

关键词: neutron skin thickness, neutron abrasion cross section, statistical abrasion ablation model

Abstract: The dependence between neutron skin thickness and neutron abrasion cross section ($\sigma_{\rm nabr}$) for neutron-rich nuclei is investigated within the framework of the statistical abrasion ablation model. Assuming that the density distributions for proton and neutron are of Fermi-type, and adjusting the diffuseness parameter of neutron density distribution in the droplet model, we find out the good linear correlation between the neutron skin thickness and the abrasion cross section $\sigma_{\rm nabr}$ for neutron-rich nuclei. The uncertainty of neutron skin thickness determined from $\sigma_{\rm nabr}$ is very small. It is suggested that $\sigma_{\rm nabr}$ can be used as a new experimental observable to extract the neutron skin thickness for neutron-rich nucleus. The scaling behaviours between neutron skin thickness and $\sigma_{\rm nabr}$, separately, for isotopes of $^{26-35}$Na, $^{44-56}$Ar, $^{48-60}$Ca, $^{67-78}$Ni are also investigated.

Key words: neutron skin thickness, neutron abrasion cross section, statistical abrasion ablation model

中图分类号:  (Collective models)

  • 21.60.Ev
24.10.Pa (Thermal and statistical models) 25.60.Dz (Interaction and reaction cross sections) 27.20.+n (6 ≤ A ≤ 19)