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Physics Letters B

Volume 312, Issue 4, 19 August 1993, Pages 377-381
Physics Letters B

Rho meson coupling in the relativistic mean field theory and description of exotic nuclei

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Abstract

The role of the isovector rho-meson coupling on the symmetry energy in the relativistic mean-field theory has been investigated. In a multi-dimensional parameter search for an appropriate force within the framework of the non-linear σωϱ model the ϱ-meson coupling has been found to have a significant effect on the neutron skin of nuclei. It has been shown that a low value of ϱ-meson coupling strength remedies the defect of some of the existing parameter sets of providing a higher neutron skin thickness of nuclei. An extraordinarily good description of highly proton- as well as neutron-rich exotic nuclei has been found. It has been observed that the proper description of both proton-rich and neutron-rich nuclei is sensitive to the symmetry energy.

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