https://doi.org/10.1140/epja/i2006-10274-6
Regular Article - Hadron Physics
Neutron-proton mass difference in nuclear matter
1
Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universität Bonn, D-53115, Germany
2
Forschungszentrum Jülich, Institut für Kernphysik (Theorie), D-52425, Jülich, Germany
3
Institute of Nuclear Physics, Academy of Sciences of Uzbekistan, 132, Tashkent, Uzbekistan
4
Physics Department and Institute of Applied Physics, National University of Uzbekistan, 174, Tashkent, Uzbekistan
* e-mail: a.wirzba@fz-juelich.de
Received:
20
November
2006
Accepted:
20
February
2007
Published online:
12
March
2007
Isospin-breaking effects in nuclear matter are studied in the framework of a medium-modified Skyrme model. The proposed effective Lagrangian incorporates both the medium influence of the surrounding nuclear environment on the single nucleon properties and an explicit isospin-breaking effect in the mesonic sector. The approach predicts that the neutron-proton mass difference decreases in isospin-symmetric nuclear matter but by a very small amount only.
PACS: 12.39.Dc Skyrmions – / 14.20.Dh Protons and neutrons – / 21.65.+f Nuclear matter –
© Società Italiana di Fisica and Springer-Verlag, 2007
