Optimization of detection strategies for epithermal neutron spectroscopy using photon-sensitive detectors.
Onorati D., Ulpiani P., Romanelli G., Andreani C., Senesi R.
II - Fisica della materia
GSSI Ex ISEF - Aula C - Martedì 24 h 09:00 - 12:00
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Bi-parametric measurements were performed using photon-sensitive detectors, installed on the VESUVIO spectrometer at the ISIS neutron source, in order to improve the detection limit of hydrogen atoms in samples and allow a more precise line-shape analysis of the atomic momentum distribution. At present, these detectors measure photons with energy greater than 600 keV in order to avoid the main sources of background. We discuss the advantage in modifying the level of the energy threshold so as to detect high-intensity low-energy prompt gamma rays emitted after the radiative neutron capture by gold, used as energy analyser on VESUVIO.