Direct measurement of resonances in $^7$Be($\alpha,\gamma$)$^{11}$C relevant to $\nu p$-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

arXiv · 2209.06465

Direct measurement of resonances in $^7$Be($\alpha,\gamma$)$^{11}$C relevant to $\nu p$-process nucleosynthesis

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Abstract

We have performed the first direct measurement of two resonances of the $^7$Be($\alpha,\gamma$)$^{11}$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 $1.73 \pm 0.25(stat.) \pm 0.40(syst.)$ eV and $125 ^{+27}_{-25}(stat.) \pm 15(syst.)$ meV, respectively. The present results have reduced the uncertainty in the $^7$Be($\alpha,\gamma$)$^{11}$C reaction rate to $\sim$ 9.4-10.7% over T = 1.5-3 GK, which is relevant for nucleosynthesis in the neutrino-driven outflows of core-collapse supernovae ($\nu p$-process). We find no effect of the new, constrained reaction rate on $\nu p$-process nucleosynthesis.

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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. 2022-09-14. Direct measurement of resonances in $^7$Be($\alpha,\gamma$)$^{11}$C relevant to $\nu p$-process nucleosynthesis. https://arxiv.org/abs/2209.06465

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