Precision study of ground state capture in the 14N(p,gamma)15O reaction

Abstract

The rate of the hydrogen-burning carbon-nitrogen-oxygen (CNO) cycle is controlled by the slowest process, 14N(p,gamma)15O, which proceeds by capture to the ground and several excited states in 15O. Previous extrapolations for the ground state contribution disagreed by a factor 2, corresponding to 15% uncertainty in the total astrophysical S-factor. At the Laboratory for Underground Nuclear Astrophysics (LUNA) 400 kV accelerator placed deep underground in the Gran Sasso facility in Italy, a new experiment on ground state capture has been carried out at 317.8, 334.4, and 353.3 keV center-of-mass energy. Systematic corrections have been reduced considerably with respect to previous studies by using a Clover detector and by adopting a relative analysis. The previous discrepancy has been resolved, and ground state capture no longer dominates the uncertainty of the total S-factor.

Phys. Rev. C, rapid comm., accepted

References in corpus (5)

• First measurement of the 14N(p,gamma)15O cross section down to 70 keV
• Feasibility of low energy radiative capture experiments at the LUNA underground accelerator facility
• Lifetime measurement of the 6792 keV state in 15O, important for the astrophysical S factor extrapolation in 14N(p,g)15O
• Solar Neutrinos: Models, Observations, and New Opportunities
• Ground state capture in ${}^{14}$N(p,$\gamma$)${}^{15}$O studied above the 259 keV resonance at LUNA

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