Summary
The 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.
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Ferreira, P.L. Neutron-proton mass difference in nuclei in a relativistic harmonic quark model. Nuov Cim A 105, 1045–1049 (1992). https://doi.org/10.1007/BF02730843
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DOI: https://doi.org/10.1007/BF02730843