Two recent measurements of $^{ 12}$C(p,$\gamma$)$^{ 13}$N reaction on natural carbon were performed by detecting $\beta^+$ decay of $^{ 13}$N residue. It is argued that the measurements at energies above the $^{ 13}$C(p,n)$^{ 13}$N reaction threshold of 3.24 MeV proton kinetic energy can be interpreted as a consequence of 1.06\% admixture of $^{ 13}$C isotope in natural carbon, as the cross section for $^{ 13}$N production raised by 3 orders of magnitude with respect to the measurements of $^{ 12}$C(p,$\gamma$)$^{ 13}$N at lower energies.
Categories: nucl-ex