Performance of 20 Ci137Cs γ-ray Compton spectrometer for the study of momentum densities

In this paper, we present the design and construction of a 20 Ci γ-ray Compton spectrometer that employs a¹³⁷ Cs source with a strong line at 661.65 keV. The total resolution of the spectrometer in momentum scale is 0.40 a.u., which is much better than the conventional²⁴¹Am Compton spectrometers. The in-house¹³⁷Cs spectrometer is very useful for the measurement of momentum densities of heavy materials. The performance of the machine is assessed using aluminum, terbium and mercury samples and the experimental data from comparable apparatus.