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

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

2004-03-26

arxiv.org/abs/nucl-th/0403080v2

Nucl.Phys. A742 (2004) 14-26

Physics

Nuclear Physics

Nuclear Theory

Scientific paper

10.1016/j.nuclphysa.2004.06.032

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

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