A re-examination of the y-ray decay of the 9.17-MeV state in N 14 , reached at the 1.75-MeV resonance in the C 13 (^,Y)N 14 reaction, has confirmed the shell-model assignments previously given to that state and the 7.03-MeV state. The observation of a weak transition to the 2.31-MeV state supports the positive parity assignment of the 9.17-MeV state. Angular distribution and correlation measurements indicate an amplitude ratio of /wave to p wave in the formation of the compound state of -0.70±0.26 and E2/M1 amplitude ratios of -0.005±0.020 and -0.6±0.1 for the 9.17 -> ground-state and 7.03 -> ground-state transitions, respectively. A slight preference for a positive parity assignment for the 6.44-MeV state is found. The results, in general, are in good agreement with the calculations of Warburton and Pinkston. The alternative shell-model configurations suggested by them for the 6.44-MeV state are examined, but existing data are found to be inconclusive.
The Si 28 (d,p)Si 29 and Si 30 (d,^)Si 31 reactions were studied in the deuteron energy range from 2 to 3 MeV. Excitation functions for the reactions leading to various final states were obtained at 30 and 135° in the laboratory system. The differential cross sections exhibited fluctuations from 40 to 200 keV wide which were uncorrelated between the two angles of measurement and between the various final states of a nucleus. Angular distributions and the resulting total cross sections were obtained at fourteen deuteron energies. These data fluctuated significantly over short energy ranges. Plane-wave Born-approximation analysis did not give consistently correct values of l n for / n >0. Distorted-wave Born-approximation predictions were fitted to the experimental distributions with reasonable success for the l n -0 and 1 transitions and with less conclusive results for the l n = 2 transitions. The transition to the sixth excited state (3.54 MeV) of Si 31 was assigned the value Z»=l. These theoretical predictions were used as a basis of estimating the relative importance of compound nucleus and direct-interaction reaction mechanisms in this energy range. The possibility of explaining the observed fluctuations in terms of the Ericson fluctuations of the compound-nucleus reaction component was explored.
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