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New measurements of differential and total cross sections for the 12 C(p, γ ) 13 N reaction have been made at beam energies of E p = 354, 390, 460, 463, 565, 750, and 1061 keV. Analysis of the astrophysical S factor S(E) for the 12 C(p, γ ) 13 N reaction at low energies and of the reaction rates has been carried out within the R-matrix approach by using the previously measured nuclear vertex constant (or the respective asymptotic normalization coefficient) for the virtual decay 13 N → p + 12 C to fix the direct capture part of the amplitude in S(E). It is demonstrated that the R-matrix approach, using the measured asymptotic normalization coefficient, can be employed as an ideal tool, minimizing the uncertainties associated with a calculation of the direct capture cross section of the 12 C(p, γ ) 13 N reaction at extremely low energies. New information on the proton and γ width for the first excited state of 13 N is obtained.

A possibility of describing experimental data for the astrophysical S-factor of p 6 Li capture at low energies is discussed within the potential cluster model with forbidden states.

Abstract:The results of new experimental measurements of p 16 O elastic scattering in the energy range of 0.6-1.0 MeV at angles of 40-160 are given. Phase shift analysis of p 16 O elastic scattering was made using these and other experimental data on differential cross sections in excitation functions and angular distributions at energies of up to 2.5 MeV.

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