Asymptotic normalization coefficients from the N-15(He-3, d)O-16 reaction and the astrophysical factor for the N-15(p, gamma)O-16 capture

The angular distributions of the N-15(He-3, d)O-16 reaction were measured with the aim to determine the direct capture rate of the astrophysical reaction N-15(p, gamma)O-16 by deducing asymptotic normalization coefficients (ANC). The N-15(p, gamma)O-16 reaction is a part of the CNO cycle having importance in the nucleosynthesis of the N and O isotopes. The measurement was carried out on the cyclotron U120M of NPI CAS at the energy 25.74 MeV of He-3 ions in a gas chamber containing the high purity N-15 isotope. The preliminary results of corresponding spectroscopic factors and ANC's were used for the estimation of the S-factor for the direct capture N-15(p, gamma)O-16. Using the widths of the resonances E-R = 312 and 962 keV, the total S-factor was determined within the framework of the R-matrix approach.