A Large area position-sensitive scintillator neutron detector using wavelength-shifting fibers, 3; Design and evaluation of detector performance for beam line detector

Nakamura, Tatsuya  ; Kawasaki, Takuro   ; Sakasai, Kaoru  ; To, Kentaro  ; Birumachi, Atsushi; Ebine, Masumi ; Soyama, Kazuhiko  ; Katagiri, Masaki*; Tsutsui, Noriaki*

A position-sensitive neutron detector that can be alternative to a conventional He gas detector is vital to address emerging He shortage problem. We have developed a new position-sensitive scintillator detector that employs wavelength-shifting fibers for light read out for the beam line of 17 and 18 in J-PARC/MLF. The detector that has 6464 pixels with a each size of 44 mm exhibited a spatial resolution of 4 mm, sensitivity of about 10 and a detector efficiency of 30-40% for thermal neutrons. These detector performances surely satisfied the detector specifications required to the beam line of 17 and 18.