Digital pulse-shape discrimination of fast neutrons and gamma rays
| dc.creator | Söderström, P. -A. | |
| dc.creator | Nyberg, J. | |
| dc.creator | Wolters, R. | |
| dc.date | 2008-05-06 | |
| dc.date.accessioned | 2026-07-07T12:09:39Z | |
| dc.date.available | 2026-07-07T12:09:39Z | |
| dc.description | Discrimination of the detection of fast neutrons and gamma rays in a liquid scintillator detector has been investigated using digital pulse-processing techniques. An experimental setup with a 252Cf source, a BC-501 liquid scintillator detector, and a BaF2 detector was used to collect waveforms with a 100 Ms/s, 14 bit sampling ADC. Three identical ADC's were combined to increase the sampling frequency to 300 Ms/s. Four different digital pulse-shape analysis algorithms were developed and compared to each other and to data obtained with an analogue neutron-gamma discrimination unit. Two of the digital algorithms were based on the charge comparison method, while the analogue unit and the other two digital algorithms were based on the zero-crossover method. Two different figure-of-merit parameters, which quantify the neutron-gamma discrimination properties, were evaluated for all four digital algorithms and for the analogue data set. All of the digital algorithms gave similar or better figure-of-merit values than what was obtained with the analogue setup. A detailed study of the discrimination properties as a function of sampling frequency and bit resolution of the ADC was performed. It was shown that a sampling ADC with a bit resolution of 12 bits and a sampling frequency of 100 Ms/s is adequate for achieving an optimal neutron-gamma discrimination for pulses having a dynamic range for deposited neutron energies of 0.3-12 MeV. An investigation of the influence of the sampling frequency on the time resolution was made. A FWHM of 1.7 ns was obtained at 100 Ms/s. | |
| dc.description | 26 pages, 14 figures, submitted to Nuclear Instruments and Methods in Physics Research A | |
| dc.identifier | https://arxiv.org/abs/0805.0692 | |
| dc.identifier | http://arxiv.org/abs/0805.0692 | |
| dc.identifier | Nucl.Instrum.Meth.A594:79-89,2008 | |
| dc.identifier | doi:10.1016/j.nima.2008.06.004 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/209696 | |
| dc.subject | Nuclear Experiment | |
| dc.subject | Instrumentation and Detectors | |
| dc.title | Digital pulse-shape discrimination of fast neutrons and gamma rays | |
| dc.type | text |