Development and characterization of a neutron detector based on a lithium glass–polymer composite
| Autor: | Cory L. Trivelpiece, J. Nattress, Michael F. Mayer, Amira Barhoumi Meddeb, Albert Foster, Igor Jovanovic, V. Kukharev, Zoubeida Ounaies |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
Bonner sphere Nuclear and High Energy Physics Physics::Instrumentation and Detectors business.industry Fission Astrophysics::High Energy Astrophysical Phenomena Nuclear Theory Detector Scintillator Nuclear physics Neutron capture Recoil Optics Neutron detection Neutron Nuclear Experiment business Instrumentation |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 785:117-122 |
| ISSN: | 0168-9002 |
| Popis: | We report on the fabrication and characterization of a neutron scintillation detector based on a Li-glass–polymer composite that utilizes a combination of pulse height and pulse shape discrimination (PSD) to achieve high gamma rejection. In contrast to fast neutron detection in a PSD medium, we combine two scintillating materials that do not possess inherent neutron/gamma PSD properties to achieve effective PSD/pulse height discrimination in a composite material . Unlike recoil-based fast neutron detection, neutron/gamma discrimination can be robust even at low neutron energies due to the high Q-value neutron capture on 6Li. A cylindrical detector with a 5.05 cm diameter and 5.08 cm height was fabricated from scintillating 1 mm diameter Li-glass rods and scintillating polyvinyltoluene. The intrinsic efficiency for incident fission neutrons from 252Cf and gamma rejection of the detector were measured to be 0.33% and less than 10−8 , respectively. These results demonstrate the high selectivity of the detector for neutrons and provide motivation for prototyping larger detectors optimized for specific applications, such as detection and event-by-event spectrometry of neutrons produced by fission. |
| Databáze: | OpenAIRE |
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