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    Indirect measurement of the Sr90(n,γ)Sr91 reaction cross section and the implications for astrophysical Zr production

    B. Greaves1, D. Mücher2, A. Spyrou3,4, P. Denissenkov5, C. M. Harris3,4, M. K. Smith3, A. Sweet6, D. L. Bleuel6, P. A. DeYoung7 et al.

    A. C. Dombos3, J. Gombas4, E. Good3, R. Lewis3,8, S. N. Liddick3,8, S. M. Lyons3, F. Naqvi9, A. Palmisano-Kyle10, C. F. Persch7, A. L. Richard11,3, E. K. Ronning3,8, N. D. Scielzo6, C. E. Svensson1,12, A. Torode13,3,4, W. W. von Seeger14,7, M. Wiedeking15,16,17, and Y. Xiao18,3

    Phys. Rev. C 112, 065803 – Published 9 December, 2025

    DOI: https://doi.org/10.1103/91xj-284t

    Abstract

    The intermediate neutron-capture process (i process) has gained notable traction within the past decade as a way to describe stellar abundance observations which cannot be explained by the slow and rapid neutron-capture processes. Despite the general success of i-process models, many open questions remain. Among the observations, Zr stands out, as its elemental abundance is difficult to replicate with available i-process models, while the reactions that affect its production through the i process are close enough to stability to study experimentally. Here, we present the experimental constraint of the nuclear level density and γ-strength function (γSF) of Sr91 using the β-Oslo method, which were then input into the TALYS Hauser-Feshbach code to produce the first experimental constraint of the Sr90(n,γ)Sr91 capture reaction. This constraint was used alongside that of Sr92(n,γ)Sr93 for a reduction in the uncertainty of [Y/Zr] production in the i-process relevant environmental neutron density of 1013.5 and 1014.5 neutrons/cm3.

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