Direct measurement of resonances in ⁷Be(α,γ)¹¹C relevant to νp-process nucleosynthesis

2022/09/14 by A. Psaltis, A. A. Chen, Psaltis, A. +39
Physics and Astronomy · Engineering · #Nuclear physics research studies #Particle physics theoretical and experimental studies #Particle accelerators and beam dynamics

paper · pdf · doi:10.48550/arxiv.2209.06465

Abstract

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 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.

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