期刊
出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2017.10.061
关键词
Nuclear beta decay; Geant4 simulations; CsI; NaI detectors; Bremsstrahlung radiation
类别
资金
- National Science Foundation (US) [PHY-11-02511]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1506084] Funding Source: National Science Foundation
The yield of photons produced by electrons slowing down in CsI and NaI was studied with four electromagnetic physics constructors included in the Geant4 toolkit. The subsequent absorption of photons in detector geometries used for measurements of the beta spectrum shape was also studied with a focus on the determination of the absorption fraction. For electrons with energies in the range 0.5-4 MeV, the relative photon yields determined with the four Geant4 constructors differ at the level of 10(-2) in amplitude and the relative absorption fractions differ at the level of 10(-4) in amplitude. The differences among constructors enabled the estimation of the sensitivity to Geant4 simulations for the measurement of the beta energy spectrum shape in He-6 decay using a calorimetric technique with ions implanted in the active volume of detectors. The size of the effect associated with photons escaping the detectors was quantified in terms of a slope which, on average, is respectively -5.4 %/MeV and -4.8 %/MeV for the CsI and NaI geometries. The corresponding relative uncertainties as determined from the spread of results obtained with the four Geant4 constructors are 0.0067 and 0.0058. (C) 2017 Elsevier B. V. All rights reserved.
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