Journal
NUCLEAR PHYSICS A
Volume 742, Issue 1-2, Pages 14-26Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysa.2004.06.032
Keywords
shell model; effective interactions; full pf-shell spectroscopy; level schemes and transition probabilities
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The evolution of the N = 28 neutron shell closure is studied in the N = 28 isotones from neutron drip line's Mg-40 to N = Z doubly magic Ni-56. It is found that the N = 28 closure vanishes at Z = 12 in favor of a deformed ground state. For Z = 14 and Z = 16 closed shell and intruder configurations are almost degenerate, leading to highly mixed ground states and to very low lying excited 0(+) states. For Z > 20 the intruder states are always above the closed shell ground states. We examine their structure and their possible existence as collective yrare bands of well-defined particle-hole character. (C) 2004 Elsevier B.V. All rights reserved.
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