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题名: Effect of Wigner energy on the symmetry energy coefficient in nuclei
作者: Tian, JL ;  Cui, HT ;  Gao, T ;  Wang, N
刊名: CHINESE PHYSICS C
出版日期: 2016
卷号: 40, 期号:9, 页码:94101
关键词: symmetry energy ;  Wigner energy ;  binding energy ;  isobaric nuclei
学科分类: Physics
DOI: http://dx.doi.org/10.1088/1674-1137/40/9/094101
通讯作者: Tian, JL (reprint author), Anyang Normal Univ, Sch Phys & Elect Engn, Anyang 455000, Peoples R China.
文章类型: Article
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.
类目[WOS]: Physics, Nuclear ;  Physics, Particles & Fields
关键词[WOS]: NEUTRON-STAR ;  MATTER ;  EQUATION ;  MODEL
收录类别: SCI
项目资助者: 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]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21548
Appears in Collections:理论物理所2016年知识产出_期刊论文

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Recommended Citation:
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.
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