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Discrimination of gamma rays due to inelastic neutron scattering in AGATA
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2009 (Engelska)Ingår i: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 607, nr 3, s. 554-563Artikel i tidskrift (Refereegranskat) Published
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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.

Ort, förlag, år, upplaga, sidor
2009. Vol. 607, nr 3, s. 554-563
Nyckelord [en]
Gamma-ray tracking, AGATA, HPGe detectors, Neutron-gamma discrimination, Inelastic neutron scattering, Geant4 Monte Carlo simulations
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URN: urn:nbn:se:uu:diva-293393OAI: oai:DiVA.org:uu-293393DiVA, id: diva2:927634
Tillgänglig från: 2016-05-12 Skapad: 2016-05-12 Senast uppdaterad: 2017-11-30

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http://www.sciencedirect.com/science/article/pii/S0168900209011735

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Nyberg, Johan

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