Nuclear Level Density and $\gamma$-ray Strength Function of $^{67}\mathrm{Ni}$ and the impact on the i-process

Author:

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

Keyword:

Nuclear Experiment, Nuclear Experiment (nucl-ex), Solar and Stellar Astrophysics (astro-ph.SR), Nuclear Theory (nucl-th)

journal:

date:

2023-07-13 16:00:00

Abstract

Proton-$\gamma$ coincidences from $(\mathrm{d},\mathrm{p})$ reactions between a $^{66}\mathrm{Ni}$ beam and a deuterated polyethylene target have been analyzed with the inverse Oslo method to find the nuclear level density (NLD) and $\gamma$-ray strength function ($\gamma$SF) of $^{67}\mathrm{Ni}$. The $^{66}\mathrm{Ni}(\mathrm{n},\gamma)$ capture cross section has been calculated using the Hauser-Feshbach model in TALYS using the measured NLD and $\gamma$SF as constraints. We confirm that $^{66}\mathrm{Ni}(\mathrm{n},\gamma)$ acts as a bottleneck when relying on one-zone nucleosynthesis calculations. However, we find that the impact of this reaction is strongly damped in multi-zone low-metallicity AGB stellar models experiencing i-process nucleosynthesis.

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