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SUMMARY:Topical Seminar: Unveiling the nuclear shape: from sphericity to s
 uperdeformation
DTSTART;VALUE=DATE-TIME:20250709T100000Z
DTEND;VALUE=DATE-TIME:20250709T110000Z
DTSTAMP;VALUE=DATE-TIME:20260421T044914Z
UID:indico-event-8169@indico.ific.uv.es
DESCRIPTION:The complex nature of the nucleon-nucleon interaction allows f
 or spherical\, oblate and prolate deformations to appear at similar energi
 es within the same nucleus. This phenomenon\, known as shape coexistence\,
  is widespread across the nuclear chart and it provides a crucial role in 
 understanding nuclear structure.\n\n\nIn our study we complement shell-mod
 el calculations with beyond-mean-field Hartree-Fock-Bogoliubov techniques 
 to shed light on the rich coexistence of differently deformed structures. 
 We infer shape coexistence from multiple observables such as: quadrupole m
 oments\, E2 transitions\, collective wavefunctions\, and shape invariants.
  The combination of all these hints allows us to understand the complexiti
 es of shape coexistence and the notion of nuclear shape itself.\n\n\nParti
 cularly\, the shape invariants provide a model-independent framework to qu
 antify the deformation parameters and their fluctuations\, which are signi
 ficant in most nuclei. We analyze how nuclear shapes evolve across the ban
 d using an extended sum-rule method to compute the shape invariants for st
 ates different than J=0. This method sheds light on long-standing question
 s\, such as whether doubly-magic nuclei are truly spherical\, whether rigi
 d triaxial nuclei exist\, and how axially symmetric prolate and oblate nuc
 lei really are.\n\n\nFor instance\, Si-28 presents a competition between t
 he oblate ground state and the excited prolate rotational band (6.5 MeV)\,
  with a possible superdeformed structure at higher energies (10-20 MeV). W
 e find that sdpf excitations are needed to correctly describe Si-28 and th
 at superdeformed shapes appear at 18-20 MeV. The doubly-magic nucleus Ca-4
 0 also presents shape coexistence between the spherical ground state\, the
  normal deformed rotational band (3.4 MeV) and the superdeformed rotationa
 l band (5.2 MeV). We analyze the fluctuations of the deformation parameter
 s associated with these states.\n\nhttps://indico.ific.uv.es/event/8169/
LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario
URL:https://indico.ific.uv.es/event/8169/
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