RADIOISOTOPES

AMATERAS is a cold-neutron disk-chopper spectrometer installed at Materials and Life science Facility (MLF) in J-PARC. The spectrometer is designed to realize both high-resolution and high-intensity with high flexibility in inelastic and quasielastic neutron scattering experiment by devoting state-of-art techniques and devices. One of the prominent future of AMATERAS is a pulse-shaping technique. The spectrometer has a pulse-shaping chopper in addition to a monochromating chopper which conventional chopper spectrometers have. By combination of two choppers, AMATERAS produces a sharp neutron pulse with high-peak-intensity from a board source pulse of a coupled moderator at MLF, and it is used for high-resolution and high-intensity experiments at this spectrometer. These choppers are newly developed high-speed disk-choppers, which maximum revolution rate is 350 Hz. Also, AMATERAS equips a large volume (59 m³) vacuumed scattering chamber, a detector bank of large area (covering solid angle: 0.67π Sr), a super mirror beam transport (vertically focused and horizontally curved) and B4C contained mortar shielding, all of which contribute to high precision measurements on AMATERAS. On AMATERAS, experiments have been carried out in broad range of research fields, such as investigations in magnetic and structural excitations, diffusive motions of atoms and molecules in liquid, glass and amorphous, slow dynamic in polymers and biomaterials and etc.