The N = 28 shell closure; from N = Z to the neutron drip line

The evolution of the N = 28 neutron shell closure is studied in the N = 28 isotones from neutron drip line's 40Mg to N = Z doubly magic 56Ni. 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 configuration...

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Bibliographic Details
Published in:Nuclear physics. A 2004-09, Vol.742 (1), p.14-26
Main Authors: Caurier, E., Nowacki, F., Poves, A.
Format: Article
Language:English
Subjects:
Effective interactions
Full pf-shell spectroscopy
Level schemes and transition probabilities
Nuclear Experiment
Physics
Shell model
Online Access:Get full text
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Summary:The evolution of the N = 28 neutron shell closure is studied in the N = 28 isotones from neutron drip line's 40Mg to N = Z doubly magic 56Ni. 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.
ISSN:0375-9474
1873-1554
DOI:10.1016/j.nuclphysa.2004.06.032