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

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

2008-07-30

arxiv.org/abs/0807.4919v1

Phys.Rev.C78:022802,2008

Physics

Nuclear Physics

Nuclear Experiment

Phys. Rev. C, rapid comm., accepted

Scientific paper

10.1103/PhysRevC.78.022802

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.

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