Search for nonresonant capture in theO16(α,γ)20Ne reaction at low energies

Citations Over TimeTop 16% of 1987 papers

Abstract

$^{20}\mathrm{Ne}$ recoils produced from the $^{16}\mathrm{O}$(\ensuremath{\alpha},\ensuremath{\gamma}${)\mathrm{}}^{20}$Ne reaction were detected in coincidence with capture \ensuremath{\gamma} rays using a recoil separator, NaI(Tl) \ensuremath{\gamma}-ray detectors, and a helium gas target. Total cross sections for cascade and ground state capture were measured in the range ${E}_{\mathrm{c}.\mathrm{m}.=1.7--}$2.35 MeV. Improved measurements of the total width and resonance strength of the ${E}_{\mathrm{c}.\mathrm{m}.=1.99}$ MeV (${J}^{\ensuremath{\pi}}$${=0}^{+}$) resonance and the resonance strength of the ${E}_{\mathrm{c}.\mathrm{m}.=1.054}$ MeV (${J}^{\ensuremath{\pi}}$${=1}^{\mathrm{\ensuremath{-}}}$) resonance are reported. The astrophysical S factor for nonresonant capture into the $^{20}\mathrm{Ne}$ ground state was measured to be 0.26\ifmmode\pm\else\textpm\fi{}0.07 MeV b, assuming an energy-independent S factor between ${E}_{\mathrm{c}.\mathrm{m}.=1.7}$ and 2.35 MeV. Using theoretical estimates for the energy dependence and branching ratios for the nonresonant capture, a best estimate for the total S factor at 300 keV of 0.7\ifmmode\pm\else\textpm\fi{}0.3 MeV b is determined.

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