Nuclear level density and γ -ray strength function of Ni 67 and the impact on the i process
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Date
2025
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
Abstract
Proton-γ coincidences from (d,p) reactions between a Ni66 beam and a deuterated polyethylene target have been analyzed with the inverse-Oslo method to find the nuclear level density (NLD) and γ-ray strength function (γSF) of Ni67. The Ni66(n,γ) capture cross section has been calculated using the Hauser-Feshbach model in TALYS using the measured NLD and γSF as constraints. The results confirm that the Ni66(n,γ) reaction acts as a bottleneck when relying on one-zone nucleosynthesis calculations. However, the impact of this reaction is strongly dampened in multizone models of low-metallicity AGB stars experiencing i-process nucleosynthesis.
Description
Keywords
Nuclear, Level Density, Nuclear Reaction Rates, Gamma Ray Strength Functions, Nuclear Astrophysics
Citation
Ingeberg, V.W., Siem, S., Wiedeking, M., Choplin, A., Goriely, S., Siess, L., Abrahams, K.J., Arnswald, K., Bello Garrote, F., Bleuel, D.L. and Cederkäll, J., 2025. Nuclear level density and γ-ray strength function of Ni 67 and the impact on the i process. Physical Review C, 111(1), p.015803.