A high spatial resolution, a large-area position-sensitive scintillation neutron detector module has been developed for a new time-of-flight Laue single crystal diffractometer to be constructed in the J-PARC MLF. We have developed a prototype detector that has a spatial resolution of 2.5 mm with a neutron-sensitive area of 320 x 320 mm2 based on a scintillator / wavelength shifting fiber technology.
The new neutron diffractometer, tentatively called jBIX, aims at collecting diffraction data from biomolecular samples that have large unit cell lengths more than 200 Å. The instrument requires a large number of detector modules that surround the sample, where each detector module should have a spatial resolution of 1-3 mm, a large detection area of 50 x 50 cm2, and high detection efficiency more than 50% for thermal neutrons. We have successfully produced a first prototype detector for this purpose and its detector performances are evaluated. In this paper we present recent experimental results obtained with these prototype detectors.