Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 22: Structure and Dynamics of Nuclei III

HK 22.3: Vortrag

Dienstag, 28. März 2017, 14:45–15:00, F 2

First evidence for shape coexistence in neutron-rich krypton isotopes* — •Kevin Moschner, Andrey Blazhev, and Rosa-Belle Gerst for the SEASTAR collaboration — Institut für Kernphysik, Universität zu Köln

Low lying excited states of the nuclei ⁹⁴Kr and ⁹⁶Kr were studied after nucleon removal reactions at intermediate beam energies at the RIKEN Radioactive Isotope Beam Factory. Previously unknown γ transitions could be observed for both nuclei. The established level schemes confirm the already observed smooth onset of collectivity which is contrary to the findings in the zirconium and strontium isotopic chains [1]. Additionally, the spectroscopic data show evidence for low-lying 0₂⁺ and 2₂⁺ states in ⁹⁶Kr. This indication of shape coexistence in the neutron rich krypton isotopes is in agreement with IBM-2 calculations based on the self-consistent beyond-mean-field approach using the Gogny D1S interaction [2].

[1] M. Albers et al., Phys. Rev. Lett. 108, 62701 (2012)

[2] K. Nomura, N. Shimizu, and T. Otsuka, Phys. Rev. C 81, 44307 (2010)

*Supported by the DFG under Grant No. BL 1513/1-1