Cross section model of water for neutron scattering study and neutron source design

✍ Scribed by Yoshinobu Edura; Nobuhiro Morishima

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 215 KB
• Volume: 350
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2004.03.175

✦ Synopsis

The motions of water molecules in liquid are described in terms of a jump diffusion mechanism and a rotational diffusive process, together with an intermolecular vibration and a hindered rotation. Intramolecular bending and stretching motions are also included. This permits us to use the present model for an interpretation of neutron scattering results in a wide range of incident energies, say, from 0:1 meV to 10 eV; at all practical temperatures. A velocity auto-correlation function, a density of states and scattering cross sections, both double-differential and total, are calculated. Good agreements with neutron-scattering and computer-simulation results are found, which makes it possible to generate a basic data library for an advanced neutron-source design.