Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 33: Structure and Dynamics of Nuclei VII
HK 33.2: Vortrag
Mittwoch, 28. Februar 2018, 14:30–14:45, HZO 80
Reduced transition probabilities in 80,82,83Se — •Julia Litzinger for the PRISMA AGATA Plunger collaboration — Institute for Nuclear Physics, Cologne (D)
Selenium nuclei in the vicinity of the neutron shell closure at N=50 are of particular interest as a change of the nuclear structure was experimentally observed on the one hand within the yrast cascade of 82Se noticeable by an isomeric yrast 81+ state and in addition between neighboring even-even isotopes 78,80,82Se induced by the filling of ν g9/2 orbital. Transition probabilities from lifetimes of excited states give insight to nuclear structure information and allow to probe nuclear models, i.e. the nuclear shell model. We performed a RDDS experiment at the INFN, Legnaro, using the Cologne Plunger, the PRISMA magnetic spectrometer for the event-by-event particle identification and the AGATA demonstrator for the γ-ray detection and tracking. Using a 82Se beam and a 238U target 80,82,83Se nuclei were produced via neutron transfer reactions and Coulomb excitation. Furthermore, shell model calculations using the effective interactions JUN45 and jj44b were performed and analyzed focussing on the nuclear structure of mainly yrast states by analyzing leading configurations constructed by protons and neutrons coupled to different spins in the wave functions. In addition the role of ν g9/2 orbital for yrast states of Selenium isotopes near N=50 was investigated.
Experimental results on transition probabilities in 80,82,83Se isotopes will be presented and discussed in terms of the shell model calculations.