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arXiv · 2206.06044

New measurement of the $E_{\mathrm{c.m.}}=323$ keV resonance in the $^{19}$F$($p,\gamma$)$^{20}$Ne reaction

M. Williams·P. Adsley·B. Davids·U. Greife·D. Hutcheon·J. Karpesky·A. Lennarz·M. Lovely·C. Ruiz
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Abstract

At temperatures below 0.1 GK the $^{19}$F$(p,\gamma)^{20}$Ne reaction is the only breakout path out of the CNO cycle. Experimental studies of this reaction are challenging from a technical perspective due to copious $\gamma$-ray background from the far stronger $^{19}$F$(p,\alpha)^{16}$O reaction channel. Here we present the first inverse kinematics study of the $^{19}$F$(p,\gamma)^{20}$Ne reaction, in which we measure the strength of the 323-keV resonance. We find a strength value of $\omega\gamma = 3.3^{+1.1}_{-0.9}$ meV, which is a factor of two larger than the most recent previous study. The discrepancy is likely the result of a direct to ground state transition which previous studies were not sensitive to. We also observe the transition to the first $2^{-}$ state, which has not been observed for this resonance in previous studies. A new thermonuclear reaction rate is calculated and compared with the literature.

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M. Williams, P. Adsley, B. Davids, U. Greife, D. Hutcheon, J. Karpesky, A. Lennarz, M. Lovely, C. Ruiz. 2022-06-13. New measurement of the $E_{\mathrm{c.m.}}=323$ keV resonance in the $^{19}$F$($p,\gamma$)$^{20}$Ne reaction. https://doi.org/10.1103/physrevc.103.055805

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