Isospin-symmetry breaking in masses of N similar or equal to Z nuclei

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Baczyk , P , Dobaczewski , J , Konieczka , M , Satula , W , Nakatsukasa , T & Sato , K 2018 , ' Isospin-symmetry breaking in masses of N similar or equal to Z nuclei ' , Physics Letters B , vol. 778 , pp. 178-183 .

Title: Isospin-symmetry breaking in masses of N similar or equal to Z nuclei
Author: Baczyk, P.; Dobaczewski, J.; Konieczka, M.; Satula, W.; Nakatsukasa, T.; Sato, K.
Contributor organization: Helsinki Institute of Physics
Date: 2018-03-10
Language: eng
Number of pages: 6
Belongs to series: Physics Letters B
ISSN: 0370-2693
Abstract: 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.
Subject: Nuclear density functional theory (DFT)
Energy density functional (EDF)
Proton-neutron mixing
Isospin symmetry breaking (ISB)
Mirror displacement energy (MDE)
Triplet displacement energy (TDE)
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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