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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. and Williams, M. (2019) A direct measurement of the ¹⁷O(α,γ)²¹Ne reaction in inverse kinematics and its impact on heavy element production Physics Letters B, 798, 134894. pp. 1-6.

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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,n)²⁰Ne 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 , 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 have 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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
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.
Date : 28 August 2019
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1016/j.physletb.2019.134894
Copyright Disclaimer : © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( Funded by SCOAP3.
Depositing User : Clive Harris
Date Deposited : 31 Oct 2019 09:38
Last Modified : 31 Oct 2019 09:38

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