Effect of Wigner energy on the symmetry energy coefficient in nuclei

doi:http://dx.doi.org/10.1088/1674-1137/40/9/094101

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	Effect of Wigner energy on the symmetry energy coefficient in nuclei
	Tian, JL ; Cui, HT ; Gao, T ; Wang, N 1,2
刊名	CHINESE PHYSICS C
	2016
卷号	40 期号:9 页码:94101
关键词	symmetry energy NEUTRON-STAR Wigner energy MATTER binding energy EQUATION isobaric nuclei MODEL
DOI	http://dx.doi.org/10.1088/1674-1137/40/9/094101
英文摘要	The nuclear symmetry energy coefficient (including the coefficient a(sym)((4)) of the I-4 term) of finite nuclei is extracted by using the differences of available experimental binding energies of isobaric nuclei. It is found that the extracted symmetry energy coefficient a(sym)(A, I) decreases with increasing isospin asymmetry I, which is mainly caused by Wigner correction, since e(sym) is the summation of the traditional symmetry energy e(sym) and the Wigner (energy ew. We obtain the optimal values J = 30.25 0.10 MeV, a(ss) = 56.18 +/- 1.25 MeV, a(sym)((4)) = 8.33 +/- 1.21 MeV and the Wigner parameter x = 2.38 +/- 0.12 through a polynomial fit to 2240 measured binding energies for nuclei with 20 <= A <= 261 with an rms deviation of 23.42 keV. We also find that the volume symmetry coefficient J similar or equal to 30 MeV is insensitive to the value x, whereas the surface symmetry coefficient a(ss) and the coefficient a(sym)((4)) are very sensitive to the value of x in the range 1 <= x <= 4. The contribution of the a(sym)((4)) term increases rapidly with increasing isospin asymmetry I. For very neutron-rich nuclei, the contribution of the asym(4) term will play an important role.
学科主题	Physics
语种	英语
资助机构	National Natural Science Foundation of China [11475004, 11275052, 11305003, 11375094, 11465005] ; Natural Science Foundation of He'nan Educational Committee [2011A140001, 2011GGJS-147] ; Open Project Program of State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences [Y4KF041CJ1]
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/23117]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Guangxi Normal Univ, Dept Phys, Guilin 541004, Peoples R China 2.Anyang Normal Univ, Sch Phys & Elect Engn, Anyang 455000, Peoples R China 3.Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Tian, JL,Cui, HT,Gao, T,et al. Effect of Wigner energy on the symmetry energy coefficient in nuclei[J]. CHINESE PHYSICS C,2016,40(9):94101.
APA	Tian, JL,Cui, HT,Gao, T,&Wang, N.(2016).Effect of Wigner energy on the symmetry energy coefficient in nuclei.CHINESE PHYSICS C,40(9),94101.
MLA	Tian, JL,et al."Effect of Wigner energy on the symmetry energy coefficient in nuclei".CHINESE PHYSICS C 40.9(2016):94101.