Volume 82, Number 1, April 2008
|Number of page(s)||6|
|Published online||13 March 2008|
Evolution of nuclear shell structure due to the pion exchange potential
School of Physics, Peking University - 100871 Beijing, China
2 Center for Mathematical Sciences, University of Aizu - Aizu-Wakamatsu, 965-8580 Fukushima, Japan
3 Department of Physics, University of Stellenbosch - Stellenbosch, South Africa
4 CNRS-IN2P3, UMR 8608 - F-91406 Orsay Cedex, France, EU
5 Université Paris-Sud - F-91405 Orsay, France, EU
Corresponding author: email@example.com
Accepted: 12 February 2008
The evolution of nuclear shell structure is investigated for the first time within density-dependent relativistic Hartree-Fock theory and the role of -exchange potential is studied in detail. The energy differences between the neutron orbits in the isotones and between the proton ones in the isotopes are extracted as a function of neutron excess . A kink around for the isotones is found as an effect of pion correlations. It is shown that the inclusion of π-coupling plays a central role to provide substantial isospin dependence of the energy differences. In particular, the tensor part of the π-coupling has an important effect on the characteristic isospin dependence observed in recent experiments.
PACS: 21.30.Fe – Forces in hadronic systems and effective interactions / 21.60.Jz – Nuclear Density Functional Theory and extensions (includes Hartree-Fock and random-phase approximations) / 24.10.Cn – Many-body theory
© EPLA, 2008
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