Abstract
s produced in Y/sup 90/ by thermal neutron irradiation of Y/sup 89/. The thermal capture cross section for the production of the isomer was measured to be 1.0 plus or minus 0.2 mb. The decay of the isomeric level is characterized by the emission of two cascade gamma rays of 0.482 and 0.203 Mev. Conversion coefficient measurements indicated that the isomeric level at 0.685- Mev decays by M4 or E5 radiation to an intermediate level at 0.203 Mev followed by a predominantly M1 transition to the ground state of Y/sup 90/. Gamma-gamma directional correlation measurements and internal conversion measurements indicated that the level at 0.203 Mev has spin 3 with odd parity and that the level at 0.685 Mev has spin 7 or 8 with even parity. A shell-model configuration of (g/sub 9/2/ d/sub 5// /sub 2/) was assigned to the isomeric state. (auth)
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