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- W2007645192 abstract "Time-dependent calculations were performed for H2O, ZrH2 and TiH2 at both 293 and 77K and for liquid methane at 90K using the Monte Carlo simulation program TIMOC. The effect of a number of important factors on moderator performance below about 200 MeV was determined. In general, a frequency distribution in which low-energy vibrational modes possess a high amplitude was found to be advantageous. Thus ambient water produced sharper pulses than zirconium hydride, and liquid methane produced shorter pulses than 77K ice. The relative advantages of cooling and poisoning were investigated, and the optimum configuration of a heterogeneously poisoned ambient water moderator determined. Heterogeneously poisoned water was found to be preferable to TiH2 because the homogeneous self-poisoning in the latter material reduces neutron leakage to a greater extent. The relative merits of cooled and poisoned moderators are dependent on the moderator geometry employed. Where slab geometry is used, the reduction in flux due to increased target-moderator separation necessitated by the use of a cryostat would more than outweigh improved moderator performance." @default.
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- W2007645192 date "1982-12-14" @default.
- W2007645192 modified "2023-09-27" @default.
- W2007645192 title "Optimisation studies for a moderator on a pulsed neutron source" @default.
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- W2007645192 doi "https://doi.org/10.1088/0022-3727/15/12/009" @default.
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