Thermal and fast neutron detection in chemical vapor deposition single-crystal diamond detectors
| Autor: | Giuseppe Prestopino, A. Tucciarone, Salvatore Almaviva, Maria Aurora Vincenti, D. Lattanzi, Marco Marinelli, Gianluca Verona-Rinati, Rosa Maria Montereali, E. Milani, Claudio Verona, Mario Pillon, Maurizio Angelone |
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| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
Nuclear reaction
diamond fission reactor instrumentation neutron detection plasma CVD radiation monitoring semiconductor counters Materials science Radiochemistry Settore FIS/01 - Fisica Sperimentale Analytical chemistry General Physics and Astronomy Diamond Chemical vapor deposition engineering.material Neutron temperature Charged particle Semiconductor detector engineering Neutron detection Neutron Nuclear Experiment |
| Popis: | Recently, a compact solid-state neutron detector capable of simultaneously detecting thermal and fast neutrons was proposed [M. Marinelli et al., Appl. Phys. Lett. 89, 143509 (2006)]. Its design is based on a p-type/intrinsic/metal layered structure obtained by Microwave Plasma Chemical Vapor Deposition (CVD) of homoepitaxial diamond followed by thermal evaporation of an Al contact and a L6iF converting layer. Fast neutrons are directly detected in the CVD diamond bulk, since they have enough energy to produce the C12(n,α)B9e reaction in diamond. Thermal neutrons are instead converted into charged particles in the L6iF layer through the L6i(n,α)T nuclear reaction. These charged particles are then detected in the diamond layer. The thickness of the L6iF converting layer and the CVD diamond sensing layer affect the counting efficiency and energy resolution of the detector both for low- (thermal) and high-energy neutrons. An analysis is carried out on the dynamics of the L6i(n,α)T and the C12(n,α)B9e reactions products, and the distribution of the energy released inside the sensitive layer is calculated. The detector counting efficiency and energy resolution were accordingly derived as a function of the thickness of the L6iF and CVD diamond layers, both for thermal and fast neutrons, thus allowing us to choose the optimum detector design for any particular application. Comparison with experimental results is also reported. |
| Databáze: | OpenAIRE |
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