MARI

This instrument is operational .

A side perspective view of the MARI spectrometer

MARI spectrometer
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MARI is a chopper spectrometer with continuous detector bank coverage ranging from 3° to 134° degrees.

MARI has a wide angular coverage and a wide energy range and good resolution making it ideal for the study of phonon densities of states in crystalline and disordered systems, and crystal field excitations in magnetic materials. MARI is the only chopper spectrometer at ISIS not to be equipped with a pixilated detector array using position sensitive detectors. This makes MARI the instrument of choice for studies of polycrystalline and powdered samples, and liquids. MARI also boasts the lowest instrumental background of the ISIS suite of chopper spectrometers, making the machine highly sensitive despite the relatively low incident neutron flux.

The MARI spectrometer was funded by the Japanese Ministry of Education, Science and Culture (Monbusho) as part of the UK-Japan Collaboration on neutron scattering. This collaboration, initiated in 1986, was the creation of the late Professor Yoshikazu Ishikawa. The spectrometer is named after Professor Ishikawa's daughter, Mari. The Japanese Symbol for Mari also happens to be the Japanese for truth.

MARI has contributed seminal work in fields such as quantum-fluids, the dynamics of disordered materials and low-dimensional magnetism. It is also used for studies of biological and polymeric materials, catalysts, thermo-electric materials, geological samples, high-temperature superconductors and liquid dynamics.

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