Research you can do with the instrument
VESUVIO spectrometer, has been designed and built by British and Italian scientists, for inelastic neutron scattering at high energy and momentum transfers operational at the ISIS pulsed neutron source. The instrument is operational at the world most intense pulsed neutron source ISIS (UK) since September 2001. This instrument has upgraded the original eVS instrument operating at the ISIS pulsed source since the year 1985, which pioneered the inelastic neutron scattering at the eV energy in the last decades.
A reactor neutron source produces a Maxwell Boltzmann distribution of neutrons from the large moderator which falls exponentially with energy above the thermal peak (F ≈ exp -(E/23 meV)). At a pulsed spallation source, it is important to have a neutron pulse width small enough to maintain good time-of-flight resolution. To this aim moderators are kept small with the result that neutrons are undermoderated, with a spectrum which is distinctly not a Maxwell Boltzmann distribution for energies above 100 meV (F ≈ 1/E). This results in an order of magnitude higher flux of epithermal neutrons than existing research reactors.
The experimental technique employed is known as Deep Inelastic Neutron Scattering (DINS) or Neutron Compton Scattering in analogy with Compton scattering of photons from electrons. It is the only experimental technique presently available which directly allows the study of mean kinetic energies, and of the atomic momentum distribution, n(p) in condensed matter.
Biology and Biomedical Research
|Other STFC||News||Site Sections||Important Links|