Abstract
The γ-ray spectrum emitted after thermal-neutron capture in 89Y was studied at the ILL high-flux reactor using a pair and Compton suppressed germanium detector. A total of 893 transitions were assigned to the decay of 90Y, 392 of which, representing more than 90% of the obtained flux, were placed in a level scheme of sixty states. The neutron binding energy of 90Y was determined as 6857.02 (17) keV. The reaction 89Y( d , p) was studied using a 22 MeV vector-polarized deuteron beam and the Munich Q3D spectrometer. Angular distributions of the vector-analyzing power and differential cross section for nearly all states up to 5 MeV excitation were taken and analyzed within the DWBA formalism. For some eighty states the transferred total and orbital angular momenta, spectroscopic factors and spins were deduced. The results of both measurements are compared and discussed in the scope of the statistical model, the shell model and the quasiparticle RPA-model.
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