${\mathrm{Be}}^9$ and ${\mathrm{B}}^{10}$ have been bombarded with alpha-particles from our electrostatic generator at energies up to 3.0 Mev and the gamma-radiation yield observed with scintillation counters. The data indicate energy levels in ${\mathrm{C}}^{13}$ at 11.95 and 12.46 Mev and in ${\mathrm{N}}^{14}$ at 12.77, 12.87, 12.90, 13.01, and 13.24 Mev. A number of higher energy levels were indicated in ${\mathrm{N}}^{14}$ but were not satisfactorily resolved.

• Received 19 December 1952

DOI:https://doi.org/10.1103/PhysRev.90.186