Measurements of small organic molecules on the single crystal neutron diffractometers for biomolecules at JAERI

Ohara, Takashi   ; Kurihara, Kazuo; Tamada, Taro; Tanaka, Ichiro*; Niimura, Nobuo*; Kuroki, Ryota

Our group has two single crystal neutron diffractometers, called BIX-3 and BIX-4, in the JRR-3 reactor-hall at JAERI. Although these diffractometers were designed for bio-macromolecules, these can be used for diffraction measurement of small organic molecules by changing the wavelength of incident neutron beam from 2.9 to 1.5 . Since both BIX-3 and 4 has a large neutron imaging plate as a detector, they can efficiently collect the Bragg reflections of organic crystal which has relatively large unit cell, the longest value of cell dimension is 50 and typical value is 20 30 . In typical measurement, the crystal size is 1 3 mm, the measurement time is 1 2 weeks and the minimum -value is 0.8 . In addition, the large imaging plate also makes the efficient measurements of fiber diffraction possible. In this presentation, we introduce the performance of BIX-3 and 4 as diffractometers for small organic molecules.