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A study of fast neutron interactions in high-purity germanium detectors
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
2005 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 546, no 3, 553-573 p.Article in journal (Refereed) Published
Abstract [en]

The interaction properties of fast neutrons in a closed-end coaxial and a planar high-purity germanium detector (HPGe) have been studied. Digitized waveforms of HPGe preamplifier signals were recorded for time-of-flight separated neutrons and γ-rays emitted by a 252Cf source. The experimental results were compared to simulations of pulse shapes and to GEANT4 simulations of the interactions of the neutrons and γ-rays in the detectors. In the analysis, special emphasis was given to elastically scattered neutrons, which for HPGe energy thresholds below about 50 keV give the largest contribution to the interaction probability, and which may be an important effect to take into account in future γ-ray spectrometers based on γ-ray tracking. No differences between the pulse shapes of detected neutrons and γ-rays were observed. The general agreement between the experimental and simulated results was found to be good.

Place, publisher, year, edition, pages
2005. Vol. 546, no 3, 553-573 p.
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-93202DOI: 10.1016/j.nima.2005.03.122OAI: oai:DiVA.org:uu-93202DiVA: diva2:166608
Available from: 2005-05-13 Created: 2005-05-13 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Characterisation of the Neutron Wall and of Neutron Interactions in Germanium-Detector Systems
Open this publication in new window or tab >>Characterisation of the Neutron Wall and of Neutron Interactions in Germanium-Detector Systems
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A Monte Carlo simulation of the Neutron Wall detector system has been performed using Geant4, in order to define optimum conditions for the detection and identification of multiple neutrons. Emphasis was put on studying the scattering of neutrons between different detectors, which is the main source of the apparent increase of the number of detected neutrons. The simulation has been compared with experimental data. The quality of neutron gated γ-ray spectra was improved for both two- and three-neutron evaporation channels. The influence of small amounts of γ rays mis-interpreted as neutrons was investigated. It was found that such γ rays dramatically reduce the quality of neutron gated γ-ray spectra.

The interaction properties of fast neutrons in a closed-end coaxial and a planar high-purity germanium detector (HPGe) were studied. Digitised waveforms of HPGe preamplifier signals were recorded for time-of-flight separated neutrons and γ rays, emitted by a 252Cf source. The experimental waveforms from the detectors were compared to simulated pulse shapes. In the analysis, special emphasis was given to the detection of elastically scattered neutrons, which may be an important effect to take into account in future spectrometers based on γ-ray tracking. No differences between neutron and γ-ray induced pulse shapes were found in this work.

A Monte Carlo simulation of the interactions of fast neutrons in the future 4π γ-ray spectrometer AGATA was also performed, in order to study the influence of neutrons on γ-ray tracking. It was shown that although there is a large probability of detecting neutrons in AGATA, the neutrons decrease the photo-peak efficiency of AGATA by only about 1% for each neutron emitted in coincidence with γ rays. The peak-to-background ratios in γ-ray spectra are, however, reduced to a much larger extent. The possibility of using AGATA as a neutron detector system was also investigated.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2005. viii+65 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 66
Keyword
Nuclear physics, High-purity Ge detectors, Liquid scintillator detectors, Neutron scattering, Digital electronics, Time-of-flight technique, Pulse-shape simulation and analysis, Monte Carlo simulations, Geant4, Gamma-ray tracking, AGATA, Neutron Wall, Kärnfysik
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-5845 (URN)91-554-6283-9 (ISBN)
Public defence
2005-06-03, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:00
Opponent
Supervisors
Available from: 2005-05-13 Created: 2005-05-13Bibliographically approved

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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Subatomic Physics

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