Absolute Intensities of Resonance Neutron Capture Gamma Rays from Cd, Te, and Sm

Abstract

The absolute intensities of gamma rays having energies between 200 and 650 kev, emitted after resonant neutron capture in ${\mathrm{Cd}}^{113}$, ${\mathrm{Te}}^{123}$, ${\mathrm{Sm}}^{147}$, ${\mathrm{Sm}}^{149}$, and ${\mathrm{Sm}}^{152}$ have been measured. The instrumentation involved a combination of time-of-flight technique and multichannel pulse-height analysis using a NaI(Tl) scintillation counter. The even-even compound nuclei studied appear to emit intense low-energy gamma rays, while the even-odd nucleus ${\mathrm{Sm}}^{153}$ shows no correspondingly intense low-energy transitions.