Abstract

Excited states in Ta-181 have been identified using time-correlated gamma-ray spectroscopy and particle-gamma techniques following the incomplete fusion reaction Yb-176(B-11,alpha 2n) Ta-181. As well as observing the rotational band based on the 11 ns isomer at 482 keV from the 5/2(+)[402] proton configuration, which is found to be essentially identical to that associated with its 7/2(+)[404] pseudospin partner, several multi-quasiparticle isomers are observed including a 33 mu s state, of probable spin and parity 21/2(-), at 1483 keV. Experimental states are compared with multi-quasiparticle calculations.

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