Improvement studies on neutron-gamma separation in HPGe detectors by using neural networks
This addresses background noise issues in gamma-ray spectra for nuclear physics experiments, but it is incremental as it builds on existing criteria with neural networks.
The study tackled the problem of neutron-gamma separation in HPGe detectors for nuclear reactions, using an artificial neural network to improve decomposition power, resulting in a 1.27-fold improvement in neutron rejection and a 0.50-fold decrease in gamma-ray loss.
The neutrons emitted in heavy-ion fusion-evaporation (HIFE) reactions together with the gamma-rays cause unwanted backgrounds in gamma-ray spectra. Especially in the nuclear reactions, where relativistic ion beams (RIBs) are used, these neutrons are serious problem. They have to be rejected in order to obtain clearer gamma-ray peaks. In this study, the radiation energy and three criteria which were previously determined for separation between neutron and gamma-rays in the HPGe detectors have been used in artificial neural network (ANN) for improving of the decomposition power. According to the preliminary results obtained from ANN method, the ratio of neutron rejection has been improved by a factor of 1.27 and the ratio of the lost in gamma-rays has been decreased by a factor of 0.50.