Ferreira, P.Leal [UNESP]2014-05-272014-05-271992-07-01Il Nuovo Cimento A Series 11, v. 105, n. 7, p. 1045-1049, 1992.0369-35461826-9869http://hdl.handle.net/11449/130553The nuclear dependence of the neutron-proton mass difference is examined in a relativistic harmonic quark model with the assumption of a swelling of the individual nucleon originated by a decrease of the spring constant inside the nuclear medium. A decrease of the neutron-proton mass difference is obtained which is reasonably small and in the right direction to cope with the Nollen-Schiffer anomaly in mirror nuclei. © 1992 Società Italiana di Fisica.1045-1049eng12.40.Aa - Bag models and other phenomenological quark models21.10.Sf - Coulomb energiesArtigo10.1007/BF02730843WOS:A1992JP98100013Acesso restrito2-s2.0-51649141379