Abstract
The method of investigating the resonance neutron groups of any nucleus which is not made radioactive by neutron capture by utílí zing the gamma-rays emitted in the capture process itself was extended to Cl, Co, Ag and Ba. The gamma-ray intensity was measured as a function of thickness of paraffin layer interposed between a D+D neutron source and a detector. As the intensity of the gamma-rays emitted front these nuclei was very small except the case of Ag, no such distinct results were obtained as in the case of Cd or of Hg reported in the previous paper. But, from analysis of the gamma-ray intensity curves, it can be shown that Cl has not any distinct resonance groups, Co has a group of about 101_??_102 e V. in energy, and Ba has a group of very high energy (perhaps of the order of 103 e. V.). The result for Ag is in qualitative agreement with that obtained by the ordinary method of β-ray activity. In addition, the relative number of gamma-ray quanta emitted per capture of a thermal neutron was obtained to be 0.64, 0.74, 1.00 and 0.82 for Cl, Ag, Cd and Hg respectively. And these results were compared with those of the other investigators
