PREPRINT
B35F28E6-4F48-401C-AACB-7E88581192BC

# First inverse kinematics measurement of resonances in ${}^{7}$Be($\alpha ,\gamma$)${}^{11}$C relevant to neutrino-driven wind nucleosynthesis using DRAGON

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

Submitted on 14 September 2022

## Abstract

A possible mechanism to explain the origin of the light $p$-nuclei in the Galaxy is the nucleosynthesis in the proton-rich neutrino-driven wind ejecta of core-collapse supernovae via the $\nu p$-process. However this production scenario is very sensitive to the underlying supernova dynamics and the nuclear physics input. As far as the nuclear uncertainties are concerned, the breakout from the $pp$-chains via the ${}^{7}$Be($\alpha ,\gamma$)${}^{11}$C reaction has been identified as an important link which can influence the nuclear flow and therefore the efficiency of the $\nu p$-process. However its reaction rate is poorly known over the relevant temperature range, T = 1.5-3 GK. We report on the first direct measurement of two resonances of the ${}^{7}$Be($\alpha ,\gamma$)${}^{11}$C reaction with previously unknown strengths using an intense radioactive ${}^{7}$Be beam from the ISAC facility and the DRAGON recoil separator in inverse kinematics. We have decreased the ${}^{7}$Be($\alpha ,\gamma$)${}^{11}$C reaction rate uncertainty to $\sim$ 9.4-10.7% over the relevant temperature region.

## Preprint

Comment: 15 pages, 12 figures. Accepted for publication in Phys. Rev. C

Subjects: Nuclear Experiment; Astrophysics - High Energy Astrophysical Phenomena