Neutron-proton effective mass splitting in neutron-rich matter

• DOI: 10.48550/arxiv.2304.13333
• Publication Date: 2023-01-01
• Authors: Sibo Wang; Hui Tong; Qiang Zhao; Chencan Wang; P. Ring; Jie Meng
• Keywords: Isovector

Nucleon effective masses in neutron-rich matter are studied with the relativistic Brueckner-Hartree-Fock (RBHF) theory full Dirac space. The neutron and proton for symmetric nuclear 0.80 times rest mass, which agrees well empirical values. In matter, mass of is found larger than that proton, neutron-proton splittings at saturation density predicted as $0.187α$ $α$ being isospin asymmetry parameter. result compared to other ab initio calculations consistent constraints from reaction structure measurements, such nucleon-nucleus scattering, giant resonances $^{208}$Pb, Hugenholtz-Van Hove theorem systematics symmetry energy its slope. predictions splitting RBHF space might be helpful constrain isovector parameters phenomenological functionals.