Journal of Instrumentation · 2022 · 10 citations · 25 references
Natural SciencesNuclear EngineeringPhysicsNuclear InstrumentationNuclear PhysicsRadiation DetectionDark MatterDetector TechnologyNeutron DetectionNuclear Cross SectionsDetector ConstructionHelium-3 DetectorsNeutron Cross-section AnalysisNeutron Cross-section MeasurementNeutron Detector EfficiencyNeutron Detector SystemsNeutron DetectorsSystematic Uncertainty Analysis
Abstract ( α,n ) reactions play an important role in nuclear astrophysics and applications and are an important background source in neutrino and dark matter detectors. Measurements of total ( α,n ) cross sections employing direct neutron detection often have a considerable systematic uncertainty associated with the energy-dependent neutron detection efficiency and the unknown initial neutron energy distribution. The 3 He BF 3 Giant Barrel (HeBGB) neutron detector was built at the Edwards Accelerator Laboratory at Ohio University to overcome this challenge. HeBGB offers a near-constant neutron detection efficiency of (7.5 ± 1.2)% over the neutron energy range 0.01 MeV–9.00 MeV, removing a significant source of systematic uncertainty present in earlier ( α,n ) cross section measurements.
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