A new HPGe setup at Gelina for measurement of gamma-ray production cross-sections from inelastic neutron scattering

Abstract

A new setup was developed at the Geel Electron LINear Accelerator (Gelina) pulsed white neutron source for the measurement of continuous energy excitation functions of gamma-ray production cross-sections in neutron-induced inelastic scattering. Characteristic gamma-rays are identified, background-free, using the good pulse height resolution of two large volume High-Purity Germanium (HPGe) detectors. High incident-energy resolution is achieved by the time-of-flight method with a flight-path length of 200 m and a time resolution of 8 ns full-width at half-maximum. A neutron energy resolution of 1.1 keV fwhm is obtained at 1 MeV (36 keV at 10 MeV) . Absolute cross-sections are obtained by measuring the neutron flux with a 235 U fission chamber. The setup was successfully applied to the determination of excitation curves of gamma-ray production cross-sections, level inelastic cross-sections and total inelastic cross-sections for 52 Cr and 58 Ni .