Speaker
Mr
Andrea Gottardo
(INFN - LNL)
Description
The study of exotic nuclei has shown that significant changes of the well known shell structure along the stability valley occur. However, little is known on the neutron-rich nuclei around 208Pb, because of the experimental difficulties to reach such nuclei. The study of these heavy nuclei is relevant also for the understanding of the r-process stellar nucleosynthesis in heavy nuclei. Neutron-rich nuclei around 208Pb were populated by using a 1 GeV*A 238U beam at GSI. The resulting fragments were separated and analysed with the FRS-Rising setup. Many neutron-rich isotopes were identified for the first time and a significant number of new isomers were hence discovered, enabling to study the structure of these isotopes. The new exotic isotopes observed, extend up to 218Pb along the Z=82 shell closure and up to N=134 and N=138 for the proton-hole and proton-particle Tl and Bi nuclei, respectively. The very exotic 210Hg nucleus was also produced and studied: its unexpected structure will be discussed. In our talk, the experimental results will be presented within state-of-the-art shell-model calculations. The significant discrepancies between the experimental findings and the behaviour expected from the usual seniority scheme will be pointed out, showing how the inclusion of effective three-body interactions (and the related two-body transition operators) helps to improve the agreement between theory and experiment.
Primary author
Mr
Andrea Gottardo
(INFN - LNL)
Co-authors
Prof.
Alison Bruce
(Univ. Brighton)
Dr
Andres Gadea
(IFIC - Valencia)
Dr
Giovanna Benzoni
(INFN - MI)
Dr
Helmut Weick
(GSI)
Dr
José Javier Valiente- Dobon
(INFN - LNL)
Dr
Jurek Grebosz
(NINP, Krakow)
Dr
Magda Gorska
(GSI)
Prof.
Marek Pfutzner
(Univ. Warsaw)
Prof.
Patrick Regan
(Univ. Surrey)
Dr
Plamen Boutachkov
(GSI)
Mr
Roberto Nicolini
(INFN - MI)
Prof.
Santo Lunardi
(Univ. Padova)
Dr
Stephane Pietri
(GSI)
Dr
Zsolt Podolyak
(Univ. Surrey)
