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SUMMARY:Continuing Influence of Shell Effects in the Nuclear Quasi-Continu
 um
DTSTART;VALUE=DATE-TIME:20190320T102000Z
DTEND;VALUE=DATE-TIME:20190320T103500Z
DTSTAMP;VALUE=DATE-TIME:20260818T115108Z
UID:indico-contribution-1340@indico.tlabs.ac.za
DESCRIPTION:Speakers: Cebo Ngwetsheni (University of the Western Cape)\nTh
 e nuclear dipole polarizability - a second order effect – governed by dy
 namics of giant dipole resonances was investigated. Along with the resulti
 ng effects of  recently observed enhancement of photon strength functions 
 at low energies for nuclide in  A ≈ 50\, 90 mass region. Empirical drops
  observed in ground-state nuclear polarizabilities indicate deviations fro
 m the effect of giant dipole resonances and reveal the presence of shell e
 ffects in semi-magic nuclei with neutron magic numbers N = 50\, 82 and 126
 . Similar drops of polarizability in the quasi-continuum of nuclei with\, 
 or close to\, magic numbers N = 28\, 50 and 82\, reflect the continuing in
 fluence of shell closures up to the nucleon separation energy. These findi
 ngs strongly support recent large-scale shell-model calculations in the qu
 asi-continuum region describing the origin of the low-energy enhancement o
 f the radiative or photon strength function as induced paramagnetism\, and
  assert the Brink-Axel hypothesis as more universal than originally expect
 ed.\n\nhttps://indico.tlabs.ac.za/event/82/contributions/1340/
LOCATION:J Block Auditorium
URL:https://indico.tlabs.ac.za/event/82/contributions/1340/
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