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Isospin-symmetry breaking in masses of N~Z nuclei

Research output: Contribution to journalLetter

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  • Pawel Baczyk
  • Jacek Dobaczewski
  • Maciej Konieczka
  • Takashi Nakatsukasa
  • Koichi Sato
  • Wojciech Satula


Publication details

JournalPhysics Letters B : Particle Physics, Nuclear Physics and Cosmology
DateAccepted/In press - 22 Dec 2017
DateE-pub ahead of print - 17 Jan 2018
DatePublished (current) - 10 Mar 2018
Pages (from-to)178-183
Early online date17/01/18
Original languageEnglish


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, 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.

Bibliographical note

© 2018, The Author(s).
Letter 5 pages, 4 figures, Supplemental Material 4 pages, 6 figures; submitted to Physical Review Letters

    Research areas

  • nucl-th


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