26 August 2015 Development of a thin scintillation films fission-fragment detector and a novel neutron source
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Abstract
Investigation of prompt fission and neutron-capture Υ rays from fissile actinide samples at the Detector for Advanced Neutron Capture Experiments (DANCE) requires use of a fission-fragment detector to provide a trigger or a veto signal. A fission-fragment detector based on thin scintillating films and silicon photomultipliers has been built to serve as a trigger/veto detector in neutron-induced fission measurements at DANCE. The fissile material is surrounded by scintillating films providing a 4π detection of the fission fragments. The scintillations were registered with silicon photomultipliers. A measurement of the 235U(n,f) reaction with this detector at DANCE revealed a correct time-of-flight spectrum and provided an estimate for the efficiency of the prototype detector of 11.6(7)%. Design and test measurements with the detector are described. A neutron source with fast timing has been built to help with detector-response measurements. The source is based on the neutron emission from the spontaneous fission of 252Cf and the same type of scintillating films and silicon photomultipliers. Overall time resolution of the source is 0.3 ns. Design of the source and test measurements with it are described. An example application of the source for determining the neutron/gamma pulse-shape discrimination by a stilbene crystal is given.
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G. Rusev, G. Rusev, M. Jandel, M. Jandel, B. Baramsai, B. Baramsai, E. M. Bond, E. M. Bond, T. A. Bredeweg, T. A. Bredeweg, A. Couture, A. Couture, J. K. Daum, J. K. Daum, A. Favalli, A. Favalli, K. D. Ianakiev, K. D. Ianakiev, M. L. Iliev, M. L. Iliev, S. Mosby, S. Mosby, A. R. Roman, A. R. Roman, R. K. Springs, R. K. Springs, J. L. Ullmann, J. L. Ullmann, C. L. Walker, C. L. Walker, } "Development of a thin scintillation films fission-fragment detector and a novel neutron source", Proc. SPIE 9593, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVII, 959314 (26 August 2015); doi: 10.1117/12.2192440; https://doi.org/10.1117/12.2192440
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