Direct Measurement of Resonances in ^{7}Be(α,γ)^{11}C Relevant to νp-Process Nucleosynthesis

A Psaltis; A A Chen; R Longland; D S Connolly; C R Brune; B Davids; J Fallis; R Giri; U Greife; D A Hutcheon; L Kroll; A Lennarz; J Liang; M Lovely; M Luo; C Marshall; S N Paneru; A Parikh; C Ruiz; A C Shotter; M Williams

doi:10.1103/PhysRevLett.129.162701

Direct Measurement of Resonances in ^{7}Be(α,γ)^{11}C Relevant to νp-Process Nucleosynthesis

Phys Rev Lett. 2022 Oct 14;129(16):162701. doi: 10.1103/PhysRevLett.129.162701.

Authors

A Psaltis^{1

2}, A A Chen^{1

2}, R Longland^{3

4}, D S Connolly⁵, C R Brune⁶, B Davids^{5

7}, J Fallis⁸, R Giri⁶, U Greife⁹, D A Hutcheon⁵, L Kroll^{1

2}, A Lennarz⁵, J Liang¹, M Lovely⁹, M Luo¹⁰, C Marshall^{3

4}, S N Paneru⁶, A Parikh¹¹, C Ruiz^{5

12}, A C Shotter¹³, M Williams^{5

14}

Affiliations

¹ Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada.
² The NuGrid Collaboration.
³ Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA.
⁴ Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27710, USA.
⁵ TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
⁶ Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA.
⁷ Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.
⁸ North Island College, 2300 Ryan Road, Courtenay, British Columbia V9N 8N6, Canada.
⁹ Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA.
¹⁰ Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
¹¹ Department de Física, Universitat Politècnica de Catalunya, E-08036 Barcelona, Spain.
¹² Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia V8W 2Y2, Canada.
¹³ School of Physics, University of Edinburgh EH9 3JZ Edinburgh, United Kingdom.
¹⁴ Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom.

PMID: 36306775
DOI: 10.1103/PhysRevLett.129.162701

Abstract

We have performed the first direct measurement of two resonances of the ^{7}Be(α,γ)^{11}C reaction with unknown strengths using an intense radioactive ^{7}Be beam and the DRAGON recoil separator. We report on the first measurement of the 1155 and 1110 keV resonance strengths of 1.73±0.25(stat)±0.40(syst) eV and 125_{-25}^{+27}(stat)±15(syst) meV, respectively. The present results have reduced the uncertainty in the ^{7}Be(α,γ)^{11}C reaction rate to ∼9.4%-10.7% over T=1.5-3 GK, which is relevant for nucleosynthesis in the neutrino-driven outflows of core-collapse supernovae (νp process). We find no effect of the new, constrained reaction rate on νp-process nucleosynthesis.