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College Park, Maryland      June 6 - 10 , 2004

WP66: Deep Inelastic Neutron Scattering from water in the 1-40 eV energy range employing the Resonance Detector Spectrometer configuration

R. Senesi, C. Andreani, A. Filabozzi (Universita degli Studi di Roma Tor Vergata, V. Ric. Scientifica 1 00133 Roma Italy; INFM UdR Roma Tor Vergata), G. Gorini (UniversitÓ degli Studi di Milano-Bicocca, Dipartimento di Fisica; Istituto Nazionale per la Fisica della Materia), S. Nufris (Universita degli Studi di Roma Tor Vergata, V. Ric. Scientifica 1 00133 Roma Italy; INFM UdR Roma Tor Vergata), E. Perelli-Cippo (UniversitÓ degli Studi di Milano-Bicocca, Dipartimento di Fisica; Istituto Nazionale per la Fisica della Materia), A. Pietropaolo (Universita degli Studi di Roma Tor Vergata, V. Ric. Scientifica 1 00133 Roma Italy; INFM UdR Roma Tor Vergata), N. Rhodes, E. M. Schooneveld (ISIS, Rutherford Appleton Laboratory), M. Tardocchi (Istituto Nazionale per la Fisica della Materia; UniversitÓ degli Studi di Milano-Bicocca, Dipartimento di Fisica)

The Resonance Detector Spectrometer configuration has recently been revised on the VESUVIO inverse geometry spectrometer at ISIS spallation source. It appears as the most promising approach for electron Volt neutron spctroscopy due to its effectiveness in detecting neutron up to 70 eV final energy. We employed this experimental configuration on VESUVIO spectrometer for Deep Inelastic Neutron Scattering measurements from a water sample. This has been done in order both to test the behavior of the detection system and to derive the single proton wave vector distribution and mean kinetic energy, at two different thermodynamic conditions, up to final neutron energies of about 37 eV. The results have been compared with those obtained through a simultaneous measurement on VESUVIO, carried out in the standard Resonance Filter Spectrometer configuration. These measurements provide a further confirmation of the effectiveness of the Resonance Detector Spectrometer configuration for electron Volt neutron spectroscopy on inverse geometry instruments operating at pulsed neutron sources.

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