TheF17(p,γ)Ne18resonant cross section

Abstract

We directly measure the $^{17}\mathrm{F}$($p$,$\ensuremath{\gamma}$)$^{18}\mathrm{Ne}$ resonant reaction using a mixed beam of $^{17}\mathrm{F}$ and $^{17}\mathrm{O}$ at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory (ORNL). The astrophysically important ${3}^{+}$ resonance at $~600$ keV above the proton threshold in $^{18}\mathrm{Ne}$ is found to have a partial width ${\ensuremath{\Gamma}}_{\ensuremath{\gamma}}=56\ifmmode\pm\else\textpm\fi{}24(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}30(\mathrm{sys})$ meV, in reasonable agreement with the theoretically predicted width. A $2\ensuremath{\sigma}$ upper limit on the direct capture of $S(E)\ensuremath{\leqslant}65$ keV b is determined at an energy of 800 keV. Experimental techniques and astrophysical implications are discussed.