Krein, G. [UNESP]Menezes, D. P.Nielsen, M.2014-05-272014-05-271992-12-01Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v. 294, n. 1, p. 7-13, 1992.0370-2693http://hdl.handle.net/11449/64288We use the Walecka model to investigate the influence of the charge symmetry breaking ρ0-ω mixing interaction on the neutron-proton self-energy difference in nuclear matter. Using 2mρ〈ρ0|H|ω〉 = -4500 MeV2, and employing the Dirac-Hartree-Fock approximation, we find that the neutron-proton self-energy difference is a decreasing function of the nuclear matter density, and that it has a value of the order of 700 keV at the normal density. The results indicate that the Nolen-Schiffer anomaly might be explained by means of relativistic nuclear models in a similar way as it is explained by means of non-relativistic models.7-13engArtigo10.1016/0370-2693(92)91630-RWOS:A1992JW98800002Acesso restrito2-s2.0-0010700451