期刊
PHYSICS LETTERS B
卷 778, 期 -, 页码 178-183出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2017.12.068
关键词
Nuclear density functional theory (DFT); Energy density functional (EDF); Proton-neutron mixing; Isospin symmetry breaking (ISB); Mirror displacement energy (MDE); Triplet displacement energy (TDE)
资金
- Polish National Science Center [2014/15/N/ST2/03454, 2015/17/N/ST2/04025]
- Academy of Finland within the FIDIPRO program
- University of Jyvaskyla within the FIDIPRO program
- Interdisciplinary Computational Science Program in CCS, University of Tsukuba
- ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan)
- JSPS under the Japan-China Scientific Cooperation Program
- NSFC under the Japan-China Scientific Cooperation Program
- Science and Technology Facilities Council [ST/L005727/1, ST/P003885/1, ST/M006433/1] Funding Source: researchfish
- STFC [ST/M006433/1, ST/L005727/1, ST/P003885/1] Funding Source: UKRI
Effects of the isospin-symmetry breaking (ISB) beyond mean-field Coulomb terms are systematically studied in nuclear masses near the N = Z line. The Coulomb exchange contributions are calculated exactly. We use extended Skyrme energy density functionals (EDFs) with proton-neutron-mixed densities, to which we add new terms breaking the isospin symmetry. Two parameters associated with the new terms are determined by fitting mirror and triplet displacement energies (MDEs and TDEs) of isospin multiplets. The new EDFs reproduce MDEs for the T = 1/2 doublets and T= 1 triplets, and TDEs for the T= 1 triplets. Relative strengths of the obtained isospin-symmetry-breaking terms are not consistent with the differences in the NN scattering lengths, a(nn), a(pp), and a(np). Based on low-energy experimental data, it seems thus impossible to delineate the strong-force ISB effects from beyond-mean-field Coulomb-energy corrections. (C) 2018 The Author(s). Published by Elsevier B.V.
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