Cascadeγrays following capture of thermal neutrons on113Cd

Abstract

Intensity distributions of cascade $\ensuremath{\gamma}$-ray transitions following the capture of thermal neutrons by ${}^{113}$Cd have been measured at the Los Alamos Neutron Science Center for various $\ensuremath{\gamma}$-ray multiplicities. The experiment was carried out at the highly segmented $4\ensuremath{\pi}$ $\ensuremath{\gamma}$-ray calorimeter---Detector for Advanced Neutron Capture Experiments (DANCE). A measured two-dimensional spectrum of counts versus $\ensuremath{\gamma}$-ray energy versus $\ensuremath{\gamma}$-ray multiplicity, from the strongest resonance in the ${}^{113}$Cd$(n,\ensuremath{\gamma})$ reaction at 0.178 eV has been compared to predictions from the statistical model. The best representation of the $\ensuremath{\gamma}$-ray cascades following the capture of thermal neutrons on ${}^{113}$Cd is presented. The intensity distribution of these cascades is of great importance for estimates of response to thermal neutrons of devices that use natural or enriched cadmium.