2015/08/31 by Junlong Tian, Jun-Long Tian, Haitao Cui +3
Engineering · Physics and Astronomy · #Asymmetry #Binding energy #Energy (signal processing) #Isobaric process #Isospin #Nuclear physics research studies #Nuclear reactor physics and engineering #Quantum Chromodynamics and Particle Interactions #Symmetry (geometry) #nucl-th
paper · pdf · doi:10.1088/1674-1137/40/9/094101
14 pages, 5 figures, Submitted to Chinese Physics C
arxiv created 2016/03/29 · arxiv updated 2016/05/24 · openalex created_date 2016/06/24 · openalex publication_date 2016/09/01 · openalex updated_date 2026/08/05
The nuclear symmetry energy coefficient (including the coefficient 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 decreases with increasing isospin asymmetry I , which is mainly caused by Wigner correction, since is the summation of the traditional symmetry energy e sym and the Wigner energy e W . We obtain the optimal values J = 30.25 ± 0.10 MeV, a ss = 56.18 ± 1.25 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 ≃ 30 MeV is insensitive to the value x , whereas the surface symmetry coefficient a ss and the coefficient are very sensitive to the value of x in the range 1 ⩽ x ⩽ 4. The contribution of the term increases rapidly with increasing isospin asymmetry I . For very neutron-rich nuclei, the contribution of the term will play an important role.