Nuclear relativistic hartree-fock approximation with effective pions

作者：Marcos S^*; Lopez Quelle M; Niembro R; Savushkin L N

来源：Physics of Atomic Nuclei, 2012, 75(12): 1486-1499.

DOI：10.1134/S1063778812110166

The effect of an interaction between the sigma- and pi-meson fields, as well as that of the mixture of pseudoscalar (PS) and pseudovector (PV) couplings for the pi N vertex on the shell structure of finite nuclei are analyzed in the framework of different nonlinear nuclearmodels based on the relativistic Hartree-Fock approximation. For the case of a dominant pi N PV coupling, it is found that if the sigma-pi interaction generates an effective pion mass increasing with the nuclear density, the unrealistic effect of pions on the shell structure can be strongly reduced, keeping, roughly, the contribution of pions to the total binding energy. The pi N PS coupling increases slightly the spin-orbit splittings and the binding energy of the single-particle levels.

• 出版日期2012-12