An approximately 50-kev thick carbon target enriched to 61 percent ${\mathrm{C}}^{13}$ was bombarded by 3.89-Mev deuterons. The neutrons resulting from the ${\mathrm{C}}^{13}(d, n){\mathrm{N}}^{14}$ and ${\mathrm{C}}^{12}(d, n){\mathrm{N}}^{13}$ reactions were detected in photographic emulsions placed at angles of 0°, 20°, 45°, and 80° with respect to the incident beam. It was possible to examine the energy level scheme of ${\mathrm{N}}^{14}$ up to 8.1-Mev excitation and by means of Butler's stripping theory to assign parities to the first three excited states.

Energy levels of ${\mathrm{N}}^{14}$ are located in this experiment at 2.23±0.10, 3.85±0.08, 4.80±0.07, 4.97±0.07, 5.76±0.05, 6.23±0.05, 6.43±0.04, 7.00±0.04, 7.72±0.04, and 8.08±0.06 Mev excitation with possible levels at 5.5±0.1, 6.1±0.1, and 7.50±0.04 Mev excitation. The parities of the 2.23- and 3.85-Mev levels are found to be even with $J\le 2$ while that of the 4.8-Mev level is found to be odd with $J=0\mathrm{} or 1$.

As an auxiliary experiment, the ${\mathrm{C}}^{13}(d, p){\mathrm{C}}^{14}$ reaction was investigated at six angles of observation again by use of photographic emulsions. No levels clearly ascribable to ${\mathrm{C}}^{14}$ were observed below the known 6.1-Mev excited state. This state appears to have odd parity, $J=0\mathrm{} or 1$.

• Received 15 December 1952

DOI:https://doi.org/10.1103/PhysRev.90.420