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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Structure and Dynamics of Nuclei V

HK 27.6: Vortrag

Dienstag, 19. März 2019, 18:00–18:15, HS 14

Recent studies of neutron-rich Kr isotopes with N≤60* — •Rosa-Belle Gerst, Kevin Moschner, Julia Litzinger, Andrey Blazhev, and Nigel Warr — IKP, Universität zu Köln

In the neutron-rich A = 100 region a sharp shape transition at N = 60 has been observed in the Sr and Zr isotopic chains. For Kr isotopes, a smooth onset of collectivity was established [1] and recent studies revealed further differences to the Sr and Zr isotopes [2,3]. Additionally, mean field calculations suggest the existence of a second minimum in potential energy surfaces for ⁹⁶Kr leading to low-lying shape-coexisting structures [1,2,4]. During the SEASTAR campaign at the RIBF at RIKEN, low lying excited states were measured in ^94,95,96Kr with the NaI DALI2 array. Due to the limited energy resolution of the array, further experiments were performed to investigate the level structure of the neutron rich Kr isotopes. At the MINIBALL array at HIE-ISOLDE, excited states in ⁹⁶Kr were populated using Coulomb-nuclear excitation. At the IPN Orsay, a pulsed beam together with the fast neutron source LICORNE and the Nu-Ball array were used to study ⁹⁰⁻⁹⁶Kr after fission of ²³⁸U. Preliminary results will be shown and compared to theoretical models.
Supported by the DFG under Grant No. BL 1513/1-1 and the BMBF under Grant No. 05P18PKCIA
[1] M. Albers et al., Nucl. Phys. A 899 (2013), 1
[2] F. Flavigny et al., Phys. Rev. Lett. 118 (2017), 242501
[3] J. Dudouet et al., Phys. Rev. Lett. 118 (2017), 162501
[4] K. Nomura et al., Phys. Rev. C 96, 034310 (2017)