Experimentally constrained (p,γ)89Y and (n,γ)89Y reaction rates relevant to the p-process nucleosynthesis

Nuclear level densities and γ-ray strength functions have been extracted for 89,90Y, using the Oslo Method on data sets from the 89Y(p,p')89Y and 89Y(d,p)90Y reactions. The γ-ray strength functions display a low-energy enhancement consistent with previous observations in this mass region (93-98Mo). Shell-model calculations give support that the observed enhancement is due to strong, low-energy M1 transitions at high excitation energies. The data were further used as input for calculations of the 88 Sr(p,γ)89Y, 88Y(n,γ)89Y, and 89Y(n,γ)90Y cross sections with the TALYS reaction code. Comparison with cross-section data, when available, shows a satisfying agreement, as well as with values from the BRUSLIB library.