Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Structure and Dynamics of Nuclei I

HK 7.4: Vortrag

Montag, 28. März 2022, 14:45–15:00, HK-H6

Investigation of 220<A<230 Po-Fr nuclei in the south-east frontier of the A-225 island of octupole deformation — •Nicolas Hubbard^1,2, Marta Polletini^3,4, Helena Albers², Giovanna Benzoni⁴, Julgen Pellumaj^5,6, and Jose Javier Valiente-Dobon⁵ for the DESPEC-S460 collaboration — ¹Technische Universitaet Darmstadt, Darmstadt, Germany — ²GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt, Germany — ³Universita degli Studi di Milano, Italy — ⁴INFN Senzione di Milano, Italy — ⁵INFN, Laboratori Nazionali di Legnaro, Italty — ⁶Universita di Ferrara, Italy

The Ra-Th (Z=88-90) actinide nuclei around mass number A~225 delimit the region of the nuclear chart where the strongest octupole correlations manifest. In general, there is a dearth of experimental information on the structure of nuclei in this region. An experiment was performed at GSI in April 2021 utilising the FRS+DESPEC setup to directly measure beta-decay half-lives, alpha-branching ratios and lifetimes of excited nuclear states. These results can be used to study the interplay between quadrupole and octupole correlations at the far end of the isle-of-deformation, to obtain beta-decay information beyond N=126 to better model the rapid neutron-capture (r-)process and to study shape isomers in 220,220Po where super-deformed and hyper-deformed structures at low excitation energies are expected. Furthermore, a calibration of the FRS+DESPEC setup using the alpha-emitting Rn and Fr isotopes was employed, providing a high-efficiency ion-decay correlation test as well as refining alpha-decay information.