Nuclear level density and γ -ray strength function of Ni 67 and the impact on the i process

Ingeberg, V. W.; Siem, S.; Wiedeking, M.; Choplin, A.; Goriely, S.; Siess, L.; Abrahams, K. J.; Arnswald, K.; Bello Garrote, F.; Bleuel, D. L.; Cederkäll, J.; Christoffersen, T. L.; Cox, D. M.; De Witte, H.; Gaffney, L. P.; Görgen, A.; Henrich, C.; Illana, A.; Jones, P.; Kheswa, B. V.; Kröll, T.; Majola, S. N. T.; Malatji, K. L.; Ojala, J.; Pakarinen, J.; Rainovski, G.; Reiter, P.; von Schmid, M.; Seidlitz, M.; Tveten, G. M.; Warr, N.; Zeiser, F.

doi:10.1103/PhysRevC.111.015803

Title: Nuclear level density and $γ$ -ray strength function of ${}^{67}{Ni}$ and the impact on the $i$ process

Journal Article · 16 January 2025 · Physical Review. C

DOI: https://doi.org/10.1103/PhysRevC.111.015803 · OSTI ID:2501000

;

; Goriely, S.;

;

; Arnswald, K.;

;

; Christoffersen, T. L.;

;

; Henrich, C.;

;

Proton- $γ$ coincidences from $(d, p)$ reactions between a ${}^{66}{Ni}$ 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 ( $γ SF$ ) of ${}^{67}{Ni}$ . The ${}^{66}{Ni} (n, γ)$ capture cross section has been calculated using the Hauser-Feshbach model in using the measured NLD and $γ SF$ as constraints. The results confirm that the ${}^{66}{Ni} (n, γ)$ 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. Published by the American Physical Society 2025

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: The ISOLDE Collaboration

Grant/Contract Number:: AC02-05CH11231; AC52-07NA27344

OSTI ID:: 2501000

Report Number(s):: LLNL--JRNL-2001155; 015803

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 1 Vol. 111; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Nuclear level density and $γ$ -ray strength function of ${}^{67}{Ni}$ and the impact on the $i$ process