Gamma-ray intensity standards: The reactions 14N(n,γ) 15N, 35Cl(n,γ) 36Cl and 53Cr(n,γ) 54Cr

Abstract

The relative and absolute intensities of γ-rays from thermal-neutron capture in 53Cr, 52Cr, 50Cr and 35Cl have been determined over the energy range 1.8–11 MeV. The absolute intensities were measured by a method in which transition intensities are compared with the well-known 100% intensity of the 7368-keV transition in 208Pb. Detector-efficiency curves were computed from the previously reported relative intensities for transitions in 14N(n,γ) 15N and 53Cr(n,γ) 54Cr, and the good agreement between their shapes over a wide energy range suggests that both sets of intensities are reliable.