Speakers
Mr
Cebo Ngwetsheni
(University of the Western Cape)
Nico Orce
(University of the Western Cape)
Description
Assuming the validity of the Brink-Axel hypothesis, the puzzling low-energy enhancement or up-bend in the photon-strength function of medium-mass nuclides with A ≈ 50 contributes to a substantial induction of the nuclear dipole polarizability in the quasi-continuum region. Revealing shell effects are manifested by drops of polarizability in the ground states of semi-magic nuclei with N = 50, 82 and 128. Similar drops in the up-bend contribution at N = 28 may reflect the continuing influence of shell closures below the nucleon separation energy. The low-energy enhancement for the available heavy nuclei presents, however, a negligible contribution to the nuclear polarizability.
Primary author
Mr
Cebo Ngwetsheni
(University of the Western Cape)
Co-author
Nico Orce
(University of the Western Cape)
