Nonstatistical effects in the C12(N15, ±) reaction

States in Na23 were populated using the C12(N15, ±) reaction. Excitation functions were measured in the energy range Ec.m.=9.51-17.33 MeV for 41 states in Na23 from 0 to 12.2 MeV in excitation energy. Angular distributions were measured at selected energies between about 2°and 110°(c.m.). A large number of correlated resonantlike structures with 400 keV (c.m.) widths were observed in addition to statistical fluctuations in the C12(N15, ±) data. Forward peaking of the on-resonant angular distributions appear to be a signature of the excitation of high-spin states in the compound nucleus. Elastic scattering excitation functions measured at backward angles show structures which are not well correlated with the anomalies seen in the reaction channels. The C12(N15, ±) data suggest that the resonant portion of the cross sections can be attributed to the population of high-spin levels close to the yrast line of the compound nucleus. NUCLEAR REACTIONS C12(N15, ±), EN15=21.4 to 39.0 MeV, measured (E) for lab=7°; measured () for 2<~<~110°(c.m.) for selected energies; elastic scattering, EN15=22 to 31.8 MeV, measured (E) at 160.2°, 161.4°, 162.6°, 163.8°, and 165°(c.m.); measured () for 142<~<~170°(c.m.) for selected energies, fluctuation, Hauser-Feshbach and single-level analyses.