Observation of isomeric decays and the high spin states in doubly-odd 208Fr

Details Observation of isomeric decays and the high spin states in doubly-odd 208Fr Observation of isomeric decays and the high spin states in doubly-odd 208Fr

2009-11-16

arxiv.org/abs/0911.2968v1

Physics

Nuclear Physics

Nuclear Experiment

11 pages, 7 figures

Scientific paper

Neutron deficient isotopes of Francium (Z=87, N=121-123) as excited nuclei were produced in the fusion-evaporation reaction: 197Au(16O,xn)[213-x]Fr at 100 MeV. The gamma-rays from the residues were observed through the high sensitivity Germanium Clover detector array INGA. The decay of the high spin states and the isomeric states of the doubly-odd 208Fr nuclei, identified from the known sequence of ground state transitions, were observed. The half lives of the 194(2) keV isomeric transition, known from earlier observations, was measured to be 233(18) ns. A second isomeric transition at 383(2) keV and half life of 33(7) ns was also found. The measured half lives were compared with the corresponding single particle estimates, based on a the level scheme obtained from the experiment.

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