Neutron capture in the giant resonance region ofN15

The ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$($n$,${\gamma }_0$)${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$ reaction has been studied over a neutron energy range of 5.6 MeV to 13 MeV. Data include a 90° excitation function measured in 200 keV steps, and seven angular distributions. The angular distribution data show good agreement with the results of a phenomenological direct semidirect model calculation. No non-$E1\mathrm{}$ radiation is required to account for these data. The cross section as a function of energy is similar to the ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$($p$,${\gamma }_0$)${}_{}{}^{15}{}_{}{}^{}\mathrm{O}$ reaction and different from the ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$($p$,${\gamma }_0$)${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$ reaction. These differences can be understood in terms of the different isospin states allowed in each reaction.