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

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dc.contributor.authorTaggart, M.P.
dc.contributor.authorAkers, C.
dc.contributor.authorLaird, A.M.
dc.contributor.authorHager, U.
dc.contributor.authorRuiz, C.
dc.contributor.authorHutcheon, D.A.
dc.contributor.authorBentley, M.A.
dc.contributor.authorBrown, J.R.
dc.contributor.authorBuchmann, L.
dc.contributor.authorChen, A.A.
dc.contributor.authorChen, J.
dc.contributor.authorChipps, K.A.
dc.contributor.authorChoplin, A.
dc.contributor.authorD'Auria, J.M.
dc.contributor.authorDavids, B.
dc.contributor.authorDavis, C.
dc.contributor.authorDiget, C. Aa.
dc.contributor.authorErikson, L.
dc.contributor.authorFallis, J.
dc.contributor.authorFox, S.P.
dc.contributor.authorFrischknecht, U.
dc.contributor.authorFulton, B.R.
dc.contributor.authorGalinski, N.
dc.contributor.authorGreife, U.
dc.contributor.authorHirschi, R.
dc.contributor.authorHowell, D.
dc.contributor.authorMartin, L.
dc.contributor.authorMountford, D.
dc.contributor.authorMurphy, A.St.J.
dc.contributor.authorOttewell, D.
dc.contributor.authorPignatari, M.
dc.contributor.authorReeve, S.
dc.contributor.authorRuprecht, G.
dc.contributor.authorSjue, S.
dc.contributor.authorVeloce, L.
dc.contributor.authorWilliams, M.
dc.date.accessioned2020-05-25T13:49:14Z
dc.date.available2020-05-25T13:49:14Z
dc.date.copyright2019en_US
dc.date.issued2019
dc.description.abstractDuring 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.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipWe would like to thank the beam delivery and ISAC operations groups at TRIUMF. In particular we gratefully acknowledge the invaluable assistance in beam production from K. Jayamanna, for delivering the high intensity beam. UK personnel were supported by the Science and Technology Facilities Council (STFC). Canadian authors were supported by the Natural Sciences and Engineering Research Council of Canada (NSERC). TRIUMF receives federal funding via a contribution agreement through the National Research Council of Canada. Authors acknowledge support from the “ChETEC” COST Action (CA16117), supported by COST (European Cooperation in Science and Technology). A. Choplin acknowledges funding from the Swiss National Science Foundation under grant P2GEP2-184492. RH acknowledges support from the World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan. The Colorado School of Mines group is supported via U.S. Department of Energy grant DE-FG02-93ER40789. MP acknowledges support to NuGrid from NSF grant PHY-1430152 (JINA Center for the Evolution of the Elements) and STFC (through the University of Hull's Consolidated Grant ST/R000840/1), and access to viper, the University of Hull High Performance Computing Facility. MP acknowledges the support from the “Lendulet-2014” Programme of the Hungarian Academy of Sciences (Hungary). MP acknowledges support from the ERC Consolidator Grant (Hungary) funding scheme (project RADIOSTAR, G.A. n. 724560).en_US
dc.identifier.citationTaggart, M. P., Akers, C., Laird, A. M., Hager, U., Ruiz, C., Hutcheon, D. A., … 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. https://doi.org/10.1016/j.physletb.2019.134894.en_US
dc.identifier.urihttps://doi.org/10.1016/j.physletb.2019.134894
dc.identifier.urihttp://hdl.handle.net/1828/11767
dc.language.isoenen_US
dc.publisherPhysics Letters Ben_US
dc.subject.departmentDepartment of Physics and Astronomy
dc.titleA direct measurement of the 17O(α,γ)21Ne reaction in inverse kinematics and its impact on heavy element productionen_US
dc.typeArticleen_US

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