Diagnosis of neutron sensitivity within a scintillator/wavelength-shifting fiber coil element by using a collimated pulsed neutron beam

Nakamura, Tatsuya  ; To, Kentaro  ; Tsutsui, Noriaki; Ebine, Masumi ; Birumachi, Atsushi; Sakasai, Kaoru  

Position-dependent neutron sensitivity within an element of the scintillator / wavelength-shifting fiber coil (SFC) was evaluated by using a collimated pulsed neutron beam at the J-PARC/MLF. The collimated beam that has a size of 1 1 mm was scanned over the SFC element. The neutron counts were recorded and plotted in each incident position. The scanning results showed less neutron sensitivity at the juncture of the rolled scintillator, suggesting less light collection efficiency or a lack of scintillator materials due to imperfect manufacturing process.