Variations in Spectra of Resonance Neutron Capture Gamma Rays in Indium

Abstract

Measurements are reported of the 0-350 kev portion of the gamma-ray spectra following neutron capture in the 1.46-, 3.86-, and 9.10-ev resonances of the ${}_{49}{}^{}{}_{}{}^{}\mathrm{In}_{}^{115}{}_{}{}^{}$ target nucleus. The prominent features of the spectra are significantly different for the three resonances as indicated by the ratios of relative intensities of the 67-, 98-, 188-, and 280-kev gamma rays. The 0-1600 kev portion of the spectrum following thermal neutron capture is presented. The absolute intensity of the 280-kev gamma ray has been measured for the three resonances.