On three topical aspects of the N=28 isotonic chain
Abstract
The evolution of single-particle orbits along the N=28 isotonic chain is studied within the framework of a relativistic mean-field approximation. We focus on three topical aspects of the N=28 chain: (a) the emergence of a new magic number at Z=14; (b) the possible erosion of the N=28 shell; and (c) the weakening of the spin-orbit splitting among low-j neutron orbits. The present model supports the emergence of a robust Z=14 subshell gap in 48Ca, that persists as one reaches the neutron-rich isotone 42Si. Yet the proton removal from 48Ca results in a significant erosion of the N=28 shell in 42Si. Finally, the removal of s1/2 protons from 48Ca causes a ~50% reduction of the spin-orbit splitting among neutron p-orbitals in 42Si.
Cite
@article{arxiv.nucl-th/0605023,
title = {On three topical aspects of the N=28 isotonic chain},
author = {J. Piekarewicz},
journal= {arXiv preprint arXiv:nucl-th/0605023},
year = {2008}
}
Comments
12 pages with 5 color figures