Analyzing power measurement for the N-14((p)over-right-arrow, gamma)O-15 reaction at astrophysically relevant energies

The N-14((p) over right arrow,gamma)O-15 reaction has been investigated by measuring the angular distributions of its cross section and analyzing power using a 270-keV polarized proton beam. Calculations using a direct-capture-plus-resonance model were compared with the data. The results indicate the presence of gamma transition amplitudes which were not considered in previous extrapolations of the astrophysical S factor to low energies. The impact on the zero-energy S factor of the N-14((p) over right arrow,gamma)O-15 reaction is discussed.