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The European Physical Journal A

, Volume 32, Issue 3, pp 299–309 | Cite as

Neutron-proton mass difference in isospin-asymmetric nuclear matter

  • U. -G. Meißner
  • A. M. Rakhimov
  • A. Wirzba
  • U. T. Yakhshiev
Regular Article - Hadron Physics

Abstract.

Isospin-breaking effects in the baryonic sector are studied in the framework of a medium-modified Skyrme model. The neutron-proton mass difference in infinite, asymmetric nuclear matter is discussed. In order to describe the influence of the nuclear environment on the skyrmions, we include energy-dependent charged and neutral pion optical potentials in the s - and p -wave channels. The present approach predicts that the neutron-proton mass difference is mainly dictated by its strong part and that it strongly decreases in neutron matter.

PACS.

12.39.Fe Chiral Lagrangians 13.40.Gp Electromagnetic form factors 21.65.+f Nuclear matter 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2007

Authors and Affiliations

  • U. -G. Meißner
    • 1
    • 2
  • A. M. Rakhimov
    • 3
    • 4
  • A. Wirzba
    • 2
  • U. T. Yakhshiev
    • 2
    • 5
  1. 1.Helmholtz-Institut für Strahlen- und Kernphysik (Theorie)Universität BonnGermany
  2. 2.Institut für Kernphysik (Theorie)Forschungszentrum JülichJülichGermany
  3. 3.Institute of Nuclear PhysicsAcademy of Sciences of UzbekistanTashkent-132Uzbekistan
  4. 4.Institute of Physics and Applied PhysicsYonsei UniversitySeoulKorea
  5. 5.Physics Department and Institute of Applied PhysicsNational University of UzbekistanTashkent-174Uzbekistan

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