Title: Data Acquisition with a Fast Digitizer for Large Volume HPGe Detectors
Authors: MIHAILESCU LIVIUBORCEA CatalinPLOMPEN ARJAN
Citation: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SP vol. 578 no. 1 p. 298-305
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2007
JRC N°: JRC37113
ISSN: 0168-9002
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC37113
DOI: 10.1016/j.nima.2007.05.231
Type: Articles in Journals
Abstract: A 12-bits and 420 MSample/s waveform digitizer was used with large volume High Purity Germanium (HPGe) detectors for measurements of gamma-ray production cross-section from inelastic neutron scattering. For these time-of-flight measurements at the GELINA white neutron source, the use of a fast digitizer significantly increases the efficiency compared with a conventional data-acquisition system. First, the pulse processing time required to obtain the amplitude with high resolution, is significantly reduced so that pulse pile-up with the prompt gamma-burst is eliminated for neutron-induced events. Second, an improved time response is obtained for which the amplitude and rise time dependence is strongly reduced compared to that of a conventional constant fraction discriminator. Excellent energy and time resolution is obtained with algorithms suitable for on-line signal processing, so that data storage is under control. Bench tests are presented that compare methods of signal processing. For the best method, the data acquisition system based on the fast digitizer was tested during measurements of gamma-production cross-sections for 206Pb and 208Pb. A direct comparison was made with results obtained with conventional electronics operated in parallel.
JRC Institute:Institute for Reference Materials and Measurements

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