Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 26: Structure and Dynamics of Nuclei VII
HK 26.5: Vortrag
Mittwoch, 12. März 2025, 15:15–15:30, HS 2 Physik
Fast timing@nu-Ball2 fission campaign: first results for the neutron-rich Kr isotopes — •Julia Fischer1, Andrey Blazhev1, Jan Jolie1, Andi Messingschlager2, Sorin Pascu3, Martin von Tresckow2, Nigel Warr1,4, and Jonathan Wilson5 for the nu-Ball2 N-SI-120 collaboration — 1IKP Cologne — 2TU Darmstadt — 3U Surrey — 4Oliver Lodge Laboratory Liverpool — 5IJCLab Orsay
Neutron-rich Kr isotopes have been shown to undergo a moderate evolution of collective structure and have been recently studied in two complementary campaigns [1,2]. To further address the nuclear structure, these nuclei were also studied at IJCLab Orsay as part of the Nuball2 fission campaign in 2022, produced by the fast-neutron-induced fission reaction 238U(n,f). The measurement
was performed with the nu-Ball2 spectrometer, a hybrid γ-spectrometer equipped with HPGe and
LaBr3(Ce) detectors, which provide excellent energy and timing resolution, respectively. In
comparison to the first fission campaign in 2018, nu-Ball1, a number of improvements on the
spectrometer and the beamline were made, in particular the tripling of the LaBr3(Ce)
coincidence efficiency (from 0.7% to 2.1%).
First preliminary results of lifetimes in neutron-rich Kr will be presented as well as compared with 5DCH and mapped IBM calculations [2].*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).
Keywords: gamma-ray spectroscopy; fast-timing; LaBr detectors; neutron-induced fission