Energy Spectra and Angular Distribution of Photoneutrons from Carbon

Energy spectra and angular distribution of photoneutrons from carbon are studied by irradiation with a 30-Mev bremsstrahlung beam. The spectra exhibit a fine structure from which the following levels in ${\mathrm{C}}^{12}$ may be distinguished: 21.4, 22.2, 22.9, 23.6, (24.3), 24.8, and 25.6 Mev. Many of these coincide with levels found in the ${\mathrm{C}}^{12}(\gamma , p)$ and ${\mathrm{C}}^{12}(\gamma , 3\alpha )$ reactions.