Transmutation Functions at High Bombarding Energies

The differential transmutation functions of the reactions, ${\mathrm{C}}^{12}+{\mathrm{D}}^2={\mathrm{N}}^{13}+n^1,$ ${\mathrm{N}}^{14}+{\mathrm{D}}^2={\mathrm{O}}^{15}+n^1,$ ${\mathrm{O}}^{16}+{\mathrm{D}}^2={\mathrm{F}}^{17}+n^1,$ have been measured at bombarding energies from 2 to 5 Mev. All three curves showed a well marked change of slope at the top of the potential barriers. These points corresponded to potential barrier heights of 2.8, 3.2, and 3.1 Mev for carbon, nitrogen, and oxygen, respectively. These values are slightly more than half those reported for the same elements with alpha-particles. The absolute cross sections for disintegration at the top of the potential barrier are 4.0, 2.8, and 6.0×${10}^{-26\mathrm{}}$ ${\mathrm{cm}}^2$ for the elements in order. At bombarding energies greater than the tops of the potential barriers the curves show interesting effects which are probably due to interfering side reactions.