Speaker
Dr
Thomas Elias Cocolios
(Instituut voor Kern- en Stralingsfysica)
Description
The region of the nuclear chart around the neutron-deficient lead isotopes is famous for the coexistence of different shapes at low energy. The lead isotopes (Z=82), however, remain spherical in their ground state. With two protons outside the lead closed core, the polonium isotopes (Z=84) also exhibit shape coexistence for the most neutron-deficient isotopes with intruding deformed bands. We investigated the influence of those intruding configurations on the ground state of the polonium isotopes by means of in-source resonant ionization laser spectroscopy.
Polonium isotopes and long-lived isomers from 191Po up to 218Po have been studied over two campaigns at the CERN-ISOLDE facility using the RILIS laser ion source. The isotope shift between all the isotopes have been extracted. Large-scale atomic calculations using the GRASP code and the RATIP package have been used to determine the electronic parameters necessary to deduce changes in the mean-square radii. The comparison between two transitions for the isotopes 200,202,204,206-210Po is used to assert the reliability of those calculations. A very large departure in the changes in <r^2> from sphericity is observed for A<200 together with a reversing of the odd-even staggering below A=196. The magnitude of the departure is much stronger than in the Hg (Z=80) and Pt (A=78) isotones, showing the importance of the specific shells involved beyond Z=82.
The analysis of the hyperfine structure of the odd-A isotopes has been performed and electromagnetic moments have been extracted. The magnetic dipole moments are consistent with a large mixing in the configuration of the ground state of the most neutron-deficient isotopes.
| Is this an invited talk? (please answer yes or no) | no |
|---|---|
| Would you prefer your contribution to be an oral presentation? (please answer yes or no) | yes |
| Would you prefer your contribution to be a poster presentation? (please answer yes or no) | no |
Authors
Mr
Maxim D Seliverstov
(Instituut voor Kern- en Stralingsfysica)
Dr
Thomas Elias Cocolios
(Instituut voor Kern- en Stralingsfysica)
Mr
Wim Dexters
(Instituut voor Kern- en Stralingsfysica)
Co-authors
Dr
Anatoli Barzakh
(Petersburg Nuclear Physics Institute)
Prof.
Andrei N Andreyev
(University of Western Scotland)
Dr
Beyhan Bastin
(GANIL)
Dr
Bruce A Marsh
(CERN)
Dr
Dima Fedorov
(Petersburg Nuclear Physics Institute)
Dr
Ernesto Mane
(TRIUMF)
Prof.
Gerard Huber
(Universitaet Mainz)
Dr
Iain G Darby
(Instituut voor Kern- en Stralingsfysica)
Dr
Iullian Stefan
(IPNO)
Dr
Jarno Van de Walle
(KVI)
Mr
Jeroen Buscher
(Instituut voor Kern- en Stralingsfysica)
Dr
Kieran Flanagan
(University of Manchester)
Ms
Marijke Keupers
(Instituut voor Kern- en Stralingsfysica)
Ms
Marika A Sjoedin
(CERN)
Prof.
Mark Huyse
(Instituut voor Kern- en Stralingsfysica)
Dr
Martin Venhart
(Instituut voor Kern- en Stralingsfysica)
Dr
Pavel Molkanov
(Petersburg Nuclear Physics Institute)
Prof.
Piet Van Duppen
(Instituut voor Kern- en Stralingsfysica)
Prof.
Robert D Page
(University of Liverpool)
Dr
Serge Franchoo
(IPNO)
Dr
Sergey Zemlyanoy
(JINR)
Prof.
Stano Antalic
(Comenius University)
Dr
Ulli Koester
(ILL)
Dr
Valentin N Fedosseev
(CERN)
Dr
Yuri Kudrtyavtsev
(Instituut voor Kern- en Stralingsfysica)
