A direct measurement of the 17O(α,γ)21Ne reaction in inverse kinematics and its impact on heavy element production

Taggart, M. P.; Akers, C.; Laird, A. M.; Hager, U.; Ruiz, C.; Hutcheon, D. A.; Bentley, M. A.; Brown, J. R.; Buchmann, L.; Chen, A. A.; Chen, J.; Chipps, K. A.; Choplin, A.; D'Auria, J. M.; Davids, B.; Davis, C.; Diget, C. Aa.; Erikson, L.; Fallis, J.; Fox, S. P.; Frischknecht, U.; Fulton, B. R.; Galinski, N.; Greife, U.; Hirschi, R.; Howell, D.; Martin, L.; Mountford, D.; Murphy, A. St. J.; Ottewell, D.; Pignatari, M.; Reeve, S.; Ruprecht, G.; Sjue, S.; Veloce, L.; Williams, M.

doi:10.1016/j.physletb.2019.134894

Title: A direct measurement of the 17O(α,γ)21Ne reaction in inverse kinematics and its impact on heavy element production

Journal Article · Fri Nov 01 00:00:00 EDT 2019 · Physics Letters. B

DOI:https://doi.org/10.1016/j.physletb.2019.134894· OSTI ID:1559356

; Akers, C.;

; Hager, U.; Ruiz, C.; Hutcheon, D. A.; Bentley, M. A.; Brown, J. R.; Buchmann, L.; Chen, A. A.; Chen, J.;

; Choplin, A.; D'Auria, J. M.; Davids, B.; Davis, C.; Diget, C. Aa.; Erikson, L.; Fallis, J.; Fox, S. P. more »

During the slow neutron capture process in massive stars, reactions on light elements can both produce and absorb neutrons thereby influencing the final heavy element abundances. At low metallicities, the high neutron capture rate of ¹⁶O can inhibit s-process nucleosynthesis unless the neutrons are recycled via the ¹⁷O(α, n)²⁰Ne reaction. The efficiency of this neutron recycling is determined by competition between the ¹⁷O(α, n)²⁰Ne and ¹⁷O(α, γ)²¹Ne reactions. While some experimental data are available on the former reaction, no data exist for the radiative capture channel at the relevant astrophysical energies. The ¹⁷O(α, γ)²¹Ne reaction has been studied directly using the DRAGON recoil separator at the TRIUMF Laboratory. The reaction cross section has been determined at energies between 0.6 and 1.6 MeV Ecm, reaching into the Gamow window for core helium burning for the first time. Resonance strengths for resonances at 0.63, 0.721, 0.81 and 1.122 MeV Ecmhave been extracted. The experimentally based reaction rate calculated represents a lower limit, but suggests that significant s-process nucleosynthesis occurs in low metallicity massive stars.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Contributing Organization:: NuGrid Collaboration

Grant/Contract Number:: AC05-00OR22725; FG02-93ER40789

OSTI ID:: 1559356

Alternate ID(s):: OSTI ID: 1566949

Journal Information:: Physics Letters. B, Journal Name: Physics Letters. B Vol. 798 Journal Issue: C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 4 works

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