Discrimination of gamma rays due to inelastic neutron scattering in AGATA
2009 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 607, no 3, 554-563 p.Article in journal (Refereed) Published
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 toinelastic 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 rayswith 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.
AGATA, Gamma-ray tracking, Geant4 Monte Carlo simulations, HPGe detectors, Inelastic neutron scattering, Neutron-gamma discrimination
IdentifiersURN: urn:nbn:se:kth:diva-80931DOI: 10.1016/j.nima.2009.05.183ISI: 000269402900010OAI: oai:DiVA.org:kth-80931DiVA: diva2:496960
QC 201202142012-02-102012-02-102012-02-14Bibliographically approved