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TECHNI Résumé de rapport

Project ID: HPRI-CT-1999-50005
Financé au titre de: FP5-HUMAN POTENTIAL
Pays: Italy

Resonant detector for epithermal neutrons

New perspectives for epithermal neutron spectroscopy have been opened by the development of the resonant detector (RD) for use on inverse geometry time of flight spectrometers at spallation sources. The RD was first proposed in the eighties and it is now, with the prototype developed in the TECHNI project, brought to a performance level exceeding conventional neutron-sensitive Li-glass scintillator detectors. It features a photon counter coupled to a neutron analyser foil. Resonant neutron absorption in the foil results in the emission of prompt gamma rays that are detected in the photon counter. The dimensions of the RD set the spatial resolution that can be achieved, ranging from a fraction of a cm to several cm. It can thus be tailored to the construction of detector arrays of different geometry.

The prototype RD design is based on a combination of YAP scintillation photon counter and uranium or gold analyser foils. This detector has already been selected for application in the upgrade of the VESUVIO spectrometer on ISIS. A special application is the Very Low Angle Detector (VLAD) bank, which will extend the kinematical region for neutron scattering to low momentum transfer (<10Angstroms(-1)) whilst still keeping energy transfer > 1eV, thus allowing new experimental studies in condensed matter systems.

Reported by

Universita degli Studi di Milano-Bicocca
Piazza della Scienza, 3
20126 Milano
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