Cross-section models of liquid para H2 and solid CH4 for design of an advanced cold-neutron source
✍ Scribed by Nobuhiro Morishima; Yasuo Nishikawa; Takeshi Mitsuyasu
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 211 KB
- Volume
- 350
- Category
- Article
- ISSN
- 0921-4526
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✦ Synopsis
a) Coherent cold-neutron scattering in liquid para-H 2 and D 2 is described theoretically in terms of a mean field approximation. The cross-section results, both double-differential and total, show good agreement with experimental ones at temperatures between melting and boiling points. (b) A cross-section library (group constant set) of solid and liquid CH 4 is generated: 80 groups between 0:1 meV and 10 eV at 20.4, 50, 90.7 and 111:7 K: It is shown through neutron transport analysis that cold neutron production in a solid CH 4 moderator is significant especially at lower temperature as an efficient convertor of fast and thermal neutrons into cold ones.