Direct Measurement of Resonances in Be7(α,γ)C11 Relevant to νp -Process Nucleosynthesis

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

doi:10.1103/physrevlett.129.162701

Title: Direct Measurement of Resonances in Be 7 ( α , γ ) C 11 Relevant to ν p -Process Nucleosynthesis

Journal Article · 13 October 2022 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.129.162701 · OSTI ID:1907571

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McMaster Univ., Hamilton, ON (Canada); The NuGrid Collaboration; UNC Chapel Hill
McMaster Univ., Hamilton, ON (Canada); The NuGrid Collaboration
North Carolina State Univ., Raleigh, NC (United States); Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory
TRIUMF, Vancouver, BC (Canada)
Ohio Univ., Athens, OH (United States)
TRIUMF, Vancouver, BC (Canada); Simon Fraser Univ., Burnaby, BC (Canada)
North Island College, Courtenay, BC (Canada)
Colorado School of Mines, Golden, CO (United States)
McMaster Univ., Hamilton, ON (Canada)
Univ. of British Columbia, Vancouver, BC (Canada)
Univ. Politecnica de Catalunya (Spain)
TRIUMF, Vancouver, BC (Canada); Univ. of Victoria, BC (Canada)
Univ. of Edinburgh, Scotland (United Kingdom)
TRIUMF, Vancouver, BC (Canada); Univ. of York (United Kingdom)

Here, we have performed the first direct measurement of two resonances of the ⁷Be(α,γ)¹¹C reaction with unknown strengths using an intense radioactive ⁷Be 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 $$125^{+27}_{-25}$$(stat) ± 15(syst) meV, respectively. The present results have reduced the uncertainty in the ⁷Be(α,γ)¹¹C reaction rate to ~9.4%–10.7% over $$\textit{T}$$ = 1.5–3 GK, which is relevant for nucleosynthesis in the neutrino-driven outflows of core-collapse supernovae ($$\textit{νp}$$ process). We find no effect of the new, constrained reaction rate on $$\textit{νp}$$-process nucleosynthesis.

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Research Organization:: Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory

Sponsoring Organization:: Deutsche Forschungsgemeinschaft (DFG); National Science Foundation (NSF); National Research Council Canada (NRC); Natural Sciences and Engineering Research Council of Canada (NSERC); State of Hesse; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-88ER40387; FG02-93ER40789; FG02-97ER41033; FG02-97ER41042; NA0003883; SC0017799

OSTI ID:: 1907571

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 129; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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