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Fast neutron detection with a segmented spectrometer

Author:
T.J. Langford  C.D. Bass  E.J. Beise  H. Breuer  D.K. Erwin  C.R. Heimbach  J.S. Nico  


Journal:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment


Issue Date:
2015


Abstract(summary):

Abstract A fast neutron spectrometer consisting of segmented plastic scintillator and 3 Heproportional counters was constructed for the measurement of neutrons in the energy range 1–200 MeV. We discuss its design, principles of operation, and the method of analysis. The detector is capable of observing very low neutron fluxes in the presence of ambient gamma background and does not require scintillator pulse-shape discrimination. The spectrometer was characterized for its energy response in fast neutron fields of 2.5 MeV and 14 MeV, and the results are compared with Monte Carlo simulations. Measurements of the fast neutron flux and energy response at 120 m above sea-level (39.130°N, 77.218°W) and at a depth of 560 m in a limestone mine are presented. Finally, the design of a spectrometer with improved sensitivity and energy resolution is discussed.


Page:
78-78


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