Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2009-12-29
EPJ Web of Conferences 3, 06008 (2010)
Physics
Nuclear Physics
Nuclear Theory
10 pages, 8 figures, presentation at the 19th Int. IUPAP Conf. on Few-Body Problems in Physics (Aug.31-Sep.5, 2009, Univ.of Bo
Scientific paper
10.1051/epjconf/20100306008
The neutron-proton mass difference in (isospin asymmetric) nuclear matter and finite nuclei is 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. Energy-dependent charged and neutral pion optical potentials in the s- and p-wave channels are included as well. The present approach predicts that the neutron-proton mass difference is mainly dictated by its strong part and that it markedly decreases in neutron matter. Furthermore, the possible interplay between the effective nucleon mass in finite nuclei and the Nolen-Schiffer anomaly is discussed. In particular, we find that a correct description of the properties of mirror nuclei leads to a stringent restriction of possible modifications of the nucleon's effective mass in nuclei.
Meißner Ulf-G.
Rakhimov A. M.
Wirzba Andreas
Yakhshiev Ulughbek T.
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