Speaker
Dr
Thomas Elias COCOLIOS
(CERN ISOLDE)
Description
The competition between spherical and deformed nuclear shapes at low energy gives rise to shape coexistence in the region of the neutron-deficient lead isotopes with Z~82 and N~104 [1]. In order to determine to which extend the ground-state of those isotopes is affected by this phenomenon, a large campaign of investigation of changes in the mean-square charge radii is on-going at ISOLDE. Using the high-sensitivity of the in-source laser spectroscopy technique, which combines the ISOLDE-RILIS lasers with the Windmill alpha-decay spectroscopy setup, it has been possible to study very exotic isotopes of lead [2-3] and polonium [4-6], down to N=100 and N=107 respectively, and more recently thallium down to N=99. In this contribution, we shall review the experimental observations on lead and polonium and present the first results of the 2011 experiment on thallium.
[1] A.N. Andreyev et al., Nature 403(2000)430
[2] H. De Witte et al., PRL 98(2007)112502
[3] M.D. Seliverstov et al., EPJA 41(2009)315
[4] T.E. Cocolios et al., JPG 37(2010)125103
[5] T.E. Cocolios et al., PRL 106(2011)052503
[6] M.D. Seliverstov et al., Letter in preparation
On behalf of a CERN-KULeuven-Paisley-Gatchina-Oulu-Orsay-Mainz-Bratislava-Brussels collaboration
Primary author
Dr
Thomas Elias COCOLIOS
(CERN ISOLDE)
Co-author
Dr
Maxim SELIVERSTOV
(University of the West of Scotland)
