On three topical aspects of the N=28 isotonic chain

Details On three topical aspects of the N=28 isotonic chain On three topical aspects of the N=28 isotonic chain

2006-05-11

arxiv.org/abs/nucl-th/0605023v1

J.Phys.G33:467-478,2007

Physics

Nuclear Physics

Nuclear Theory

12 pages with 5 color figures

Scientific paper

10.1088/0954-3899/34/3/005

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.

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