Williams, M., Laird, A. M. orcid.org/0000-0003-0423-363X, Choplin, A. et al. (7 more authors) (2022) Constraints on key $^{17}$O($α,γ$)$^{21}$Ne resonances and impact on the weak s-process. Physical Review C. 065805. ISSN 2469-9993
Abstract
The efficiency of the slow neutron-capture process in massive stars is strongly influenced by neutron-capture reactions on light elements. At low metallicity, $^{16}$O is an important neutron absorber, but the effectiveness of $^{16}$O as a light-element neutron poison is modified by competition between subsequent $^{17}$O$(\alpha,n)^{20}$Ne and $^{17}$O$(\alpha,\gamma)^{21}$Ne reactions. The strengths of key $^{17}$O$(\alpha,\gamma)^{21}$Ne resonances within the Gamow window for core helium burning in massive stars are not well constrained by experiment. This work presents more precise measurements of resonances in the energy range $E_{c.m.} = 612 - 1319$ keV. We extract resonance strengths of $\omega\gamma_{638} = 4.85\pm0.79$ $\mu$eV, $\omega\gamma_{721} = 13.0^{+3.3}_{-2.4}$ $\mu$eV, $\omega\gamma_{814} = 7.72\pm0.55$ meV and $\omega\gamma_{1318} = 136\pm 13$ meV, for resonances at $E_{c.m.} =$ 638, 721, 814 and 1318 keV, respectively. We also report an upper limit for the 612 keV resonance of $\omega\gamma
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details |
Keywords: | nucl-ex,astro-ph.SR,nucl-th |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 01 Jul 2022 09:00 |
Last Modified: | 16 Oct 2024 18:31 |
Published Version: | https://doi.org/10.1103/PhysRevC.105.065805 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1103/PhysRevC.105.065805 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:188626 |