Browsing by Author "Siem, Sunniva"

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    Nuclear level density and γ -ray strength function of Ni 67 and the impact on the i process
    (American Physical Society, 2025) Abrahams, Kenzo J; Ingeberg, Vetle Wegner; Siem, Sunniva
    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.