Neutrons fromC(d,n)NandCu(d,n)Zn

The energy distribution among the neutrons emitted from carbon and copper bombarded by 10-Mev deuterons has been investigated by means of proton recoils in photographic emulsions. A description of the method is given. Two excited levels are observed in ${\mathrm{N}}^{13}$ at 2.29±0.12 Mev and 3.48±0.12 Mev, the latter not having been observed previously. $Q$ for the production of ${\mathrm{N}}^{13}$ in the ground state is found to be -0.29±0.09 Mev. Both the reactions ($d,n$) and ($d,2n$) have been identified in the effects occurring when copper is bombarded by 10-Mev deuterons. Quantitative agreement with the expected energy range of the neutrons from the ($d,2n$) reaction is found. There is also evidence for some type of level structure in Zn. Discussion is given of a possible interpretation of this structure.