The impact of 17O + α reaction rate uncertainties on the s-process in rotating massive stars

Frost-Schenk, J.; Adsley, P.; Laird, A. M.; Longland, R.; Angus, C.; Barton, C.; Choplin, A.; Diget, C. Aa; Hirschi, R.; Marshall, C.; Portillo Chaves, F.; Setoodehnia, K.

doi:10.1093/mnras/stac1373

Title: The impact of 17O + α reaction rate uncertainties on the s-process in rotating massive stars

Journal Article · Thu May 19 00:00:00 EDT 2022 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stac1373· OSTI ID:1873198

Frost-Schenk, J.;

; Laird, A. M.; Longland, R.; Angus, C.; Barton, C.; Choplin, A.; Diget, C. Aa; Hirschi, R.; Marshall, C.;

; Setoodehnia, K.

Massive stars are crucial to galactic chemical evolution for elements heavier than iron. Their contribution at early times in the evolution of the Universe, however, is unclear due to poorly constrained nuclear reaction rates. The competing ¹⁷O(α, γ)²¹Ne and ¹⁷O(α, n)²⁰Ne reactions strongly impact weak s-process yields from rotating massive stars at low metallicities. Abundant ¹⁶O absorbs neutrons, removing flux from the s-process, and producing ¹⁷O. The ¹⁷O(α, n)²⁰Ne reaction releases neutrons, allowing continued s-process nucleosynthesis, if the ¹⁷O(α, γ)²¹Ne reaction is sufficiently weak. While published rates are available, they are based on limited indirect experimental data for the relevant temperatures and, more importantly, no uncertainties are provided. The available nuclear physics has been evaluated, and combined with data from a new study of astrophysically relevant ²¹Ne states using the ²⁰Ne(d, p)²¹Ne reaction. Constraints are placed on the ratio of the (α, n)/(α, γ) reaction rates with uncertainties on the rates provided for the first time. The new rates favour the (α, n) reaction and suggest that the weak s-process in rotating low-metallicity stars is likely to continue up to barium and, within the computed uncertainties, even to lead.

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Research Organization:: North Carolina State University, Raleigh, NC (United States); Duke Univ., Durham, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); European Union’s Horizon 2020

Grant/Contract Number:: SC0017799; FG02-97ER41033; FG02-97ER41042

OSTI ID:: 1873198

Alternate ID(s):: OSTI ID: 1883159; OSTI ID: 1907606

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Vol. 514 Journal Issue: 2; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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