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SUMMARY:Shell-model study of 28Si: shape coexistence and superdeformation
DTSTART;VALUE=DATE-TIME:20240527T142000Z
DTEND;VALUE=DATE-TIME:20240527T144000Z
DTSTAMP;VALUE=DATE-TIME:20260716T012410Z
UID:indico-contribution-23132@indico.ific.uv.es
DESCRIPTION:Speakers: Dorian Frycz (University of Barcelona)\nWe study the
  shape coexistence in the nucleus $^{28}$Si with the nuclear shell model u
 sing numerical diagonalizations complemented with variational calculations
  based on the projected generator-coordinate method. Although the ground-s
 tate oblate rotational band is well described in the $sd$ shell by the USD
 B interaction\, the second excited $0^+_3$ state and higher-energy levels 
 lack the features of a prolate rotational band\, in contrast to experiment
 . Thus\, guided by the quasi-SU(3) model\, we slightly lower the energy of
  the $d_{3/2}$ orbital\, which leads to a good description of the prolate 
 band. Alternatively\, we extend the configuration space to also include th
 e $pf$ shell\, finding that the prolate band appears naturally using the S
 DPF-NR interaction. Finally\, we address the possibility of superdeformati
 on in $^{28}$Si within the $sdpf$ space. Our results disfavour the appeara
 nce of superdeformed states with excitation energy below 20 MeV.\n\nhttps:
 //indico.ific.uv.es/event/7332/contributions/23132/
LOCATION:ADEIT - Valencia
URL:https://indico.ific.uv.es/event/7332/contributions/23132/
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