Abstract
The energies and intensities of gamma rays from the decay of 87Y(t12/=79.8 h), produced in the 87Sr(p,n) reaction at Ep=18 MeV, were measured with a Ge(Li) detector. Precision energy values of 388.531(3) and 484.805(5) keV were determined for the two 87Y gamma rays using the mixed source technique. The intensity ratio of the 485 and 389 keV gamma rays was measured to be 1.0875(45). This ratio was used to derive log ft values for the decay of 87Y to the 389 and 873 keV levels of 87Sr. The results are compared with predictions of a shell-model calculation which assumes 56Ni as an inert core. The Sr+p bombardment also produced radioactive 83Rb and 85Sr. Measurements via the mixed source technique resulted in the following gamma -ray energies: 85Sr, 514.005(4) keV; 83Rb, 520.389(12), 529.591(13) and 552.588(20) keV.
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