Isospin-symmetry breaking in masses of N ≃ Z nuclei
Ba̧czyk, P., Dobaczewski, J., Konieczka, M., Satuła, W., Nakatsukasa, T., & Sato, K. (2018). Isospin-symmetry breaking in masses of N ≃ Z nuclei. Physics Letters B, 778, 178-183. doi:10.1016/j.physletb.2017.12.068
Published inPhysics Letters B
© 2018 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license. Funded by SCOAP3.
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 N N scattering lengths, ann, app , and anp. Based on low-energy experimental data, it seems thus impossible to delineate the strong-force ISB effects from beyond-mean-field Coulomb-energy corrections.
ydinfysiikka tiheys tiheysfunktionaaliteoria energia protonit neutronit nuclear physics density density functional theory energy protons neutrons nuclear density functional theory (DFT) energy density functional (EDF) proton–neutron mixing isospin symmetry breaking (ISB) mirror displacement energy (MDE) triplet displacement energy (TDE)