PHYSICAL JOURNAL A S-factor of 14N(p; °)15O at astrophysical energies?

Abstract. The astrophysical S(E) factor of 14N(p; °)15O has been measured for e®ective center-of-mass energies between Eeff = 119 and 367 keV at the LUNA facility using TiN solid targets and Ge detectors. The data are in good agreement with previous and recent work at overlapping energies. R-matrix analysis reveals that due to the complex level structure of 15O the extrapolated S(0) value is model dependent and calls for additional experimental e®orts to reduce the present uncertainty in S(0) to a level of a few percent as required by astrophysical calculations