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

Abstract : 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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Preprints, Working Papers, ...
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Contributor : Frédéric Nowacki <>
Submitted on : Monday, March 29, 2004 - 11:51:06 AM
Last modification on : Thursday, April 23, 2020 - 2:26:10 PM
Long-term archiving on: : Friday, September 17, 2010 - 5:57:15 PM




Etienne Caurier, Frédéric Nowacki, Alfredo Poves. The N=28 shell closure; from N=Z to the neutron drip line. 2004. ⟨hal-00001364v2⟩



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