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Discrimination of gamma rays due to inelastic neutron scattering in AGATA
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2009 (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. 607, no 3, 554-563 p.Article in journal (Refereed) PublishedText
Abstract [en]

Possibilities of discriminating neutrons and γ rays in the AGATA γ -ray tracking spectrometer have been investigated with the aim of reducing the background due to inelastic scattering of neutrons in the high-purity germanium crystals. This background may become a serious problem especially in experiments with neutron-rich radioactive ion beams. Simulations using the Geant4 toolkit and a tracking program based on the forward tracking algorithm were carried out by emitting neutrons and γ rays from the center of AGATA. Three different methods were developed and tested in order to find “fingerprints” of the neutron interaction points in the detectors. In a simulation with simultaneous emission of six neutrons with energies in the range 1–5 MeV and 10 γ rays with energies between 150 and 1450 keV, the peak-to-background ratio at a γ -ray energy of 1.0 MeV was improved by a factor of 2.4 after neutron rejection with a reduction of the photopeak efficiency at 1.0 MeV of only a factor of 1.25.

Place, publisher, year, edition, pages
2009. Vol. 607, no 3, 554-563 p.
Keyword [en]
Gamma-ray tracking, AGATA, HPGe detectors, Neutron-gamma discrimination, Inelastic neutron scattering, Geant4 Monte Carlo simulations
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-293393OAI: oai:DiVA.org:uu-293393DiVA: diva2:927634
Available from: 2016-05-12 Created: 2016-05-12 Last updated: 2016-05-12

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Nyberg, Johan
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Department of Physics and AstronomyNuclear Physics
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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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