Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 70: Structure and Dynamics of Nuclei XII
HK 70.4: Vortrag
Donnerstag, 31. März 2022, 17:00–17:15, HK-H6
Gamma ray spectroscopy of the neutron-rich 94,95,96Kr* - results from the NuBall and SEASTAR campaigns — •Rosa-Belle Gerst, Andrey Blazhev, and Nigel Warr — Institut für Kerphysik, Universität zu Köln
The isotopic chain of krypton isotopes is home to a variety of nuclear-shape phenomena and has been studied extensively. In recent years, we have studied the neutron-rich isotopes during the SEASTAR campaign at the RIBF at the RIKEN Nishina Center and during the NuBall campaign at the ALTO facility at the IPN Orsay. While the former populated the isotopes of interest via nucleon knockout reactions, the latter used fast-neutron induced fission of 238U. In all three studied nuclei, previously unknown gamma-transitions were observed extending the level schemes [1,2]. A new short-lived isomer was discovered in 94Kr [1]. For 95Kr, the analysis of prompt gamma-radiation with and without coincidence of delayed radiation identified the prompt gamma-rays [2] as either feeding or bypassing the known isomeric state [3]. For 96Kr, the measured new transitions imply the existence of low-lying low-spin non-yrast states [2]. The comparison of the new experimental results with 5DCH and mapped IBM calculations, both using the Gogny D1M interaction, could suggest oblate-prolate shape coexistence in the krypton isotopes already at N=60 [2].
Supported by the DFG under Grant No. BL 1513/1-1
[1] R.-B Gerst et al., Phys. Rev. C 102, 064323 (2020).
[2] R.-B. Gerst et al., submitted to PRC.
[3] J. Genevey et al., Phys. Rev. C 73, 037308 (2006).