Evaluation of two-dimensional multiwire neutron detector with individual line readout under pulsed neutron irradiation

To, Kentaro  ; Nakamura, Tatsuya  ; Sakasai, Kaoru  ; Soyama, Kazuhiko  ; Yamagishi, Hideshi*

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.