Neutron Capture Gamma-Ray Spectra

Photographic plates soaked in ${\mathrm{D}}_2$O may be used for gamma-ray studies. By measuring the ranges of the photo-protons resulting from the photo-disintegration of the deuterons in the ${\mathrm{D}}_2$O, the $\gamma$-ray energies can be found. The method is limited to $\gamma$-rays of energy above 3 Mev. The neutron capture $\gamma$-ray spectra of Al, Cl, Fe, Br, Cd, La, W, Au, and Hg have been obtained by this method. The results suggest a possible dependence of the shape of the spectra on the odd-even character of the compound nucleus.