Abstract
-rays following the and decays of the very neutron rich produced by the photofission of have been studied at the newly built ISOL facility of IPN Orsay: ALTO. Two activities were observed and assigned to two -decaying states: , and , . Excitation energies of the and states of were measured at keV and keV. Comparison with HFB GCM calculations allows to establish the collective character of this nucleus. The excitation energy of the state in known to carry a large part of the neutron strength was measured at keV. Altogether these data allow to confirm the new single particle state ordering which appears immediately after the double and shell closure and to designate as a fragile and easily polarized doubly-magic core.
4 More- Received 21 October 2008
DOI:https://doi.org/10.1103/PhysRevC.80.044308
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