MEASUREMENT OF NEUTRON INELASTIC SCATTERING CROSS SECTIONS FOR ~(52)Cr FROM THRESHOLD UP TO 18 MeV

摘要

The powerful white neutron spectrum from Gelina is used for the investigation of gamma ray production cross sections in the reaction ~(52)Cr(n,n'gamma)~(52)Cr. The gamma rays from the inelastic process are detected with two large volume HPGe detectors placed at 110 deg and 150 deg with respect to the beam direction. The neutron flux has been measured with a ~(235)U fission chamber. For the main transitions the inelastic cross section is given with an incident neutron energy resolution ranging from 1.12 keV at 1 MeV to 35.7 keV at 10 MeV, the overall statistical error being <5percent. Based on the known ~(52)Cr level scheme, the level and total inelastic cross sections have been obtained up to 3.77 MeV excitation energy. Progress on the implementation of a new acquisition system based on a fast digitiser is presented in this paper.