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To, Kentaro; Nakamura, Tatsuya; Sakasai, Kaoru; Soyama, Kazuhiko; Yamagishi, Hideshi*
Journal of Instrumentation (Internet), 9(11), p.C11019_1 - C11019_9, 2014/11
Times Cited Count：3 Percentile：16.04(Instruments & Instrumentation)A multiwire-type two-dimensional neutron detector system using individual line readout and optical signal transmission method is developed for use in the Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC). The sensitive area was 128 
128 mm
with a pitch of 1 mm in both directions (x and y), and the 256 signal lines are individually readout by signal-processing electronics. First irradiation experiments using pulsed neutrons are performed at the J-PARC/MLF. The developed detector could determine time-of-flight spectra and time-resolved two-dimensional images accurately with time range from 0 to 40 ms that arise from 25-Hz pulsed neutrons. Finally, the validity of the detector system is confirmed by a neutron reflectometry using Ni/Ti multilayer.
LiF scintillator for detecting thermal neutronsNakamura, Tatsuya; To, Kentaro; Honda, Katsunori; Sakasai, Kaoru; Soyama, Kazuhiko; Katagiri, Masaki*
Journal of Instrumentation (Internet), 9(11), p.C11020_1 - C11020_7, 2014/11
Times Cited Count：0 Percentile：0.01(Instruments & Instrumentation)An empirical formula that predicts a spatial resolution of a thermal neutron detector comprising wavelength-shifting (WLS) fibre arrays coupled with a ZnS/LiF scintillator screen was derived based on the experimental results. The spatial resolutions of the test detectors were measured separately to evaluate the contributions due to light spread within the part of the scintillator and the part of the WLS fibres layres. The calculated results by using the derived formula reproduced the results with the test detectors, demonstrating the feasibility of the formula for designing a neutron-detecting head of this type detector.
