Spectra and pulse shapes of a decoupled liquid hydrogen moderator
The neutron leakage current and time distributions have been determined experimentally for the decoupled liquid para-hydrogen moderator installed at the LANSCE pulsed spallation neutron source. The current measurements were performed using an ORDELA Neutron Beam Monitor (Model 4100N). The time distribution was measured with a time focused diffractometer using 'perfect' single crystals of silicon. In this report, a short discussion of the ortho-para hydrogen problem and an estimate of the ortho-para concentration in the circulating liquid hydrogen loop will be presented. This will be followed by a discussion of the neutron scattering cross sections and the empirical model used to fit the data. The results for the neutron leakage and the time distributions will be presented. (auth)
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1163244
- Report Number(s):
- IWCMPNS-1997; CONF-9709132-; TRN: US1500277
- Resource Relation:
- Conference: International Workshop on Cold Moderators for Pulsed Neutron Sources, Argonne, IL (United States), 29 Sep - 2 Oct 1997; Related Information: In: Proceedings of the International Workshop on Cold Moderators for Pulsed Neutron Sources, Iverson, E.B and Carpenter, J.M. (eds.), 1997, sponsored by OECD, under the MegaScience Forum
- Country of Publication:
- United States
- Language:
- English
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