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On three topical aspects of the N=28 isotonic chain

Author:
Piekarewicz, J.  


Journal:
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS


Issue Date:
2007


Abstract(summary):

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 Ca-48, that persists as one reaches the neutron-Rich isotone Si-42. Yet the proton removal from 48Ca results in a significant erosion of the N = 28 shell in 42Si. Finally, the removal of s(1/2) protons from Ca-48 causes a similar to 50% reduction of the spin-orbit splitting among neutron p-orbitals in Si-42.


Page:
467---477


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