The 90 Zr(α,γ) 94 Mo, 92 Zr(α,γ) 96 Mo, and 74 Ge(α,γ) 78 Se reaction cross sections were measured for the first time in an effort to expand the existing experimental database for (α,γ) reactions relevant for the production of the p nuclei in the universe. In particular, the 90 Zr(α,γ) 94 Mo reaction was identified by a sensitivity study for its potential impact for the γ-process mass flow in the region of the light p nuclei. The measurements were performed for energies Eα = 9.5 − 12.0 MeV at the University of Notre Dame using the SuN detector and the γ-summing technique. The results are compared to theoretical calculations from the TALYS and NON-SMOKER nuclear reaction codes, and it is shown that the data greatly reduces the uncertainty in the cross section for the measured energies. The TALYS parameters that provide the best description of the experimental data are reported.PACS numbers 24.60. Dr, 25.40.Lw, 26.30.Ef
A systematic measurement of the (α,γ) reaction for all the stable nickel isotopes has been performed using the γ-summing technique. For two of the isotopes, 60 Ni and 61 Ni, the α-capture cross sections have been experimentally measured for the first time. For 58,62,64 Ni, the current measurement is in excellent agreement with earlier results found in the literature, and additionally extends the energy range of the measured cross sections up to 8.7 MeV. The data provided a tool for testing the cross section predictions of Hauser-Feshbach calculations. The experimental results were compared to the cross sections calculated with the TALYS 1.6 code and commonly used databases: NON-SMOKER and BRUSLIB. For each of the investigated isotopes a combination of input parameter for Talys was identified that best reproduces the experimental data and recommended reaction rate has been calculated. Additionally, a set of inputs for Hauser-Feshbach calculations was given that, simultaneously for all the isotopes under consideration, reproduces the experimental data within the experimental uncertainties.
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