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Title: Thermal and fast neutron detection in chemical vapor deposition single-crystal diamond detectors

Abstract

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 {sup 6}LiF converting layer. Fast neutrons are directly detected in the CVD diamond bulk, since they have enough energy to produce the {sup 12}C(n,{alpha}){sup 9}Be reaction in diamond. Thermal neutrons are instead converted into charged particles in the {sup 6}LiF layer through the {sup 6}Li(n,{alpha})T nuclear reaction. These charged particles are then detected in the diamond layer. The thickness of the {sup 6}LiF 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 {sup 6}Li(n,{alpha})T and the {sup 12}C(n,{alpha}){sup 9}Be 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 {sup 6}LiF and CVD diamond layers,more » 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.« less

Authors:
; ; ; ; ; ;  [1]; ; ;  [2]; ;  [3]
  1. Dipartimento di Ingegneria Meccanica, Universita di Roma 'Tor Vergata', Via del Politecnico 1, I-00133 Roma (Italy)
  2. Associazione EURATOM-ENEA sulla Fusione, Via E. Fermi 45, I-00044 Frascati (Roma) (Italy)
  3. ENEA-FIS C.R. Frascati, Via E. Fermi 45, I-00044 Frascati (Roma) (Italy)
Publication Date:
OSTI Identifier:
21133977
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 103; Journal Issue: 5; Other Information: DOI: 10.1063/1.2838208; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA PARTICLES; ALUMINIUM; BERYLLIUM 9; CARBON 12 TARGET; CHEMICAL VAPOR DEPOSITION; DIAMONDS; ENERGY RESOLUTION; EVAPORATION; FAST NEUTRONS; LITHIUM 6 TARGET; LITHIUM FLUORIDES; MONOCRYSTALS; NEUTRON DETECTION; NEUTRON DETECTORS; NEUTRON REACTIONS; SEMICONDUCTOR DETECTORS; SEMICONDUCTOR MATERIALS; THERMAL NEUTRONS

Citation Formats

Almaviva, S., Marinelli, M., Milani, E., Prestopino, G., Tucciarone, A., Verona, C., Verona-Rinati, G., Angelone, M., Lattanzi, D., Pillon, M., Montereali, R. M., and Vincenti, M. A. Thermal and fast neutron detection in chemical vapor deposition single-crystal diamond detectors. United States: N. p., 2008. Web. doi:10.1063/1.2838208.
Almaviva, S., Marinelli, M., Milani, E., Prestopino, G., Tucciarone, A., Verona, C., Verona-Rinati, G., Angelone, M., Lattanzi, D., Pillon, M., Montereali, R. M., & Vincenti, M. A. Thermal and fast neutron detection in chemical vapor deposition single-crystal diamond detectors. United States. doi:10.1063/1.2838208.
Almaviva, S., Marinelli, M., Milani, E., Prestopino, G., Tucciarone, A., Verona, C., Verona-Rinati, G., Angelone, M., Lattanzi, D., Pillon, M., Montereali, R. M., and Vincenti, M. A. Sat . "Thermal and fast neutron detection in chemical vapor deposition single-crystal diamond detectors". United States. doi:10.1063/1.2838208.
@article{osti_21133977,
title = {Thermal and fast neutron detection in chemical vapor deposition single-crystal diamond detectors},
author = {Almaviva, S. and Marinelli, M. and Milani, E. and Prestopino, G. and Tucciarone, A. and Verona, C. and Verona-Rinati, G. and Angelone, M. and Lattanzi, D. and Pillon, M. and Montereali, R. M. and Vincenti, M. A.},
abstractNote = {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 {sup 6}LiF converting layer. Fast neutrons are directly detected in the CVD diamond bulk, since they have enough energy to produce the {sup 12}C(n,{alpha}){sup 9}Be reaction in diamond. Thermal neutrons are instead converted into charged particles in the {sup 6}LiF layer through the {sup 6}Li(n,{alpha})T nuclear reaction. These charged particles are then detected in the diamond layer. The thickness of the {sup 6}LiF 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 {sup 6}Li(n,{alpha})T and the {sup 12}C(n,{alpha}){sup 9}Be 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 {sup 6}LiF 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.},
doi = {10.1063/1.2838208},
journal = {Journal of Applied Physics},
number = 5,
volume = 103,
place = {United States},
year = {Sat Mar 01 00:00:00 EST 2008},
month = {Sat Mar 01 00:00:00 EST 2008}
}