Excited States and Collectivity in $^{88}$Se

Abstract : The γ decays of excited states in the very neutron-rich nucleus 88Se have been observed following the cold neutron-induced fission of 235U at the PF1B facility of the Institut Laue-Langevin (ILL), Grenoble. The EXILL array was used to measure γ - γ - γ coincidences, which were then analysed to build a level scheme of 88Se. A low (2+1) energy hints at the onset of quadrupole deformation and the identification of possible members of a (2+2) band provide evidence for γ vibrations. Shell-model calculations using a 78Ni core reproduce the experimental decay scheme well, implying that interactions between particles in the π f5/2 p and vsd orbits are responsible for much of the collectivity present. The algebraic collective model has also been used to interpret the experimental data, showing that that the experimental spectrum is consistent with 88Se being a transitional nucleus, possessing weak static β deformation and γ instability.
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Communication dans un congrès
6th Workshop on Nuclear Fission and Spectroscopy of Neutron-Rich Nuclei, Mar 2017, Chamrousse, France. EPJ Web Conf., 193, pp.05002, 2018, 〈10.1051/epjconf/201819305002〉
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Soumis le : mardi 11 décembre 2018 - 21:07:15
Dernière modification le : mardi 12 février 2019 - 21:05:26

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G. Simpson, I. Grachev, G. Thiamova, M. Ramdhane, K. Sieja, et al.. Excited States and Collectivity in $^{88}$Se. 6th Workshop on Nuclear Fission and Spectroscopy of Neutron-Rich Nuclei, Mar 2017, Chamrousse, France. EPJ Web Conf., 193, pp.05002, 2018, 〈10.1051/epjconf/201819305002〉. 〈hal-01952145〉

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