Decay of a three-quasiparticle isomer in the neutron-rich nucleus 183Ta

Excited states in neutron-rich tantalum isotopes have been studied with deep-inelastic reactions using Xe-136 ions incident on a W-186 target. New transitions observed below the tau=1.3 mu s isomer in Ta-183 have enabled the establishment of its energy and put limits on the spin and parity. On the basis of the reduced hindrances for the depopulating transitions, a 3-quasiparticle configuration of nu 1/2(-)[510]11/2(+)[615] circle times pi 9/2(-)[514] is suggested.

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