SMuK 2023 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Structure and Dynamics of Nuclei IX
HK 49.6: Talk
Wednesday, March 22, 2023, 18:45–19:00, SCH/A118
Lifetime measurements of neutron-rich Kr isotopes within the nu-Ball2 fission campaign — •J. Fischer1, A. Blazhev1, C. Hiver2, J. Jolie1, A. Messingschlager3, S. Pascu4, M. von Tresckow3, N. Warr1, and J. N. Wilson2 for the nu-Ball2 N-SI-120 collaboration — 1U Cologne — 2IJCLab Orsay — 3TU Darmstadt — 4U Surrey
Nuclei beyond the band of stability are crucial to our understanding of the atomic nucleus and nuclear forces. In recent years, neutron-rich krypton isotopes have been studied as part of various campaigns. New gamma-transitions and levels were discovered in the first nu-Ball and SEASTAR-2015 campaigns [1,2] which compared to theory indicated oblate-prolate shape coexistence already in 96Kr [2]. However, the limited information on transition strengths did not allow for firm conclusions. Therefore lifetime measurements were performed at the IJCLab Orsay as part of the nu-Ball2 fission campaign. The nuclei of interest were produced with a fast-neutron-induced fission reaction 238U(n,f). The improved multidetector-array (nu-Ball2), a novel hybrid γ-spectrometer consisting of HPGe and LaBr3(Ce) detectors provided excellent energy and timing information, respectively. The fast-timing method allows for lifetime determination down to about 10 ps and thus a possibility to determine transition strengths in the nuclei of interest. Preliminary results will be presented. *Supported by BMBF under Verbundprojekt 05P2021 (ErUM-FSP T07) grant 05P21PKFN1. / [1] R.-B. Gerst et al., PRC 102, 064323 (2020). ; [2] R.-B. Gerst et al., PRC 105, 024302 (2022).