Nonconservation of Isospin in theN14(d, d′)N14Reaction

The ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}(d, d^{\prime }){}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ reaction to the first excited state of ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$(2.31 MeV, $0^{+}$, 1) was investigated for isospin nonconservation. Angular distributions were taken for nine incident deuteron energies between 5 and 10 MeV. The symmetries observed in the angular distributions indicate a predominantly compound-nuclear reaction mechanism. The observed violation arises most probably from "Coulomb mixing" in the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ compound nucleus. The measured cross-section ratio of the first to the second (3.95 MeV, $1^{+}$, 0) excited state of ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ varied from 3 to 1% for deuteron energy increasing from 6 to 10 MeV. The region of excitation of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ between 26.0 and 31.0 MeV was investigated by measuring the excitation function for inelastic deuteron scattering to the second excited state of ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ for deuteron energies between 5.9 and 12.2 MeV at a laboratory angle of 60°. Gross structure was observed at excitation energies of 27.2 and 29.6 MeV in ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$. The presented data are compared with photoabsorption data for this range of excitation energy.