A double crystal diffraction spectrometer for studies of high energy gamma-rays resulting from thermal neutron capture
A double flat crystal diffraction gamma spectrometer designed on the basis of a 4-m Cauchois focusing instrument with scintillation counting, developed before by the authors is described. The spectrometer is designed for studies of high-energy gamma spectra from the (n,γ) reaction. Gamma-rays whose energies are within the neutron binding energy range for a number of nuclei have been recorded. The instrument resolution for diffraction from the (211) planes of 52 mm thick calcite crystals in the range of E = 0.5 to 6 MeV is ∆E/ E = 0.2 to 0.8%. The spectrometer enables us to make use of the sources featuring neutron capture cross sections over several barns. The instrument parameters were investigated in the 35Cl (n,γ) 36Cl reaction. The experimental data are compared with the results of the calculations performed.