Institute of Theoretical Physics

Chinese Academy of Sciences

State Key Laboratory of Theoretical Physics

Seminar

Title

题目

Coulomb Exchange Contributions in Relativistic Mean Field Models: Can One, and Should One Treat Them?

Speaker

报告人

Prof. Nguyen Van Giai

Affiliation

所在单位

IPNOrsay, Université Paris-Sud

Date

日期

16:00, Aug 3 (Monday), 2015

Venue

地点

老楼322会议室

Abstract

摘要

Self-consistent mean field methods are very widely used for microscopic studies of nuclear systems. Among them, the so-called Relativistic Mean Field (RMF) approach has become very popular because of its many successes in describing nuclear properties with a relatively small number of adjusted parameters and solving self-consistently a set of local Dirac equations. This is possible because the RMF is actually a Hartree approximation, the Fock terms being just dropped and somehow taken care of by the Hartree terms with appropriate meson-nucleon coupling strengths. There is however one feature which is definitely missing, it is the exchange contribution of the Coulomb interaction between protons. In non-relativistic Hartree-Fock calculations with Skyrme-type Hamiltonians the Coulomb exchange effects are not small and they are easily handled by the so-called Slater approximation. In this talk we show that the relativistic version of the Slater approximation can be used to accurately evaluate self-consistently Coulomb exchange effects in the RMF approach, thus improving the RMF predictions with practically no extra computational effort.

Contact Personn

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