Study of the 13N(p,γ)14O reaction at stellar energies in a microscopic coupled-channel approach

We have studied the 13N(p,γ)14O reaction at stellar energies within a microscopic coupled channel approach based on the generator coordinate method. Our calculation improves previous investigations as we explicitly take into account the internal excitation of the 13N fragment nucleus. We find that the cross section at stellar energies is mainly dominated by the Jπ=1- resonance at E=0.547 MeV in 14O for which we calculate a γ-width of Γγ=1.6 eV. For temperatures T=108 to 109 K the thermally averaged 13N(p,γ)14O reaction rate is also sensitive to a direct capture contribution which we derive consistently within our microscopic study. Finally we discuss the astrophysical implications of the 13N(p,γ)14O rate for which we adopt a mean value of the various theoretical estimates of the γ-width of the 1- resonance (Γγ=1.8 eV). (orig.)