THE EFFECTIVE TEMPERATURE OF THERMAL NEUTRONS IN A SINGLE ROD OF NATURAL URANIUM
Technical Report
·
OSTI ID:4318355
A cylinder of natural uranium 1.2 in. outside dianieter was insented in a block of graphite which thermalized a beam of neutrons from BER0. The counting rates of U/sup 233/ U/sup 235/, and Pu/sup 239/ fission chambers inside the uranium were measured. Several uranium cylinders with inside diameters ranging from 0.9 in. to 0.44 in. were investigated, and the variation of the ratios of the counting rates with wall thickness was found. These ratios indicate that the effective neutron temperature increases by only 15 deg C from the moderator to the maximum thickness of uranium. A discussion is included which shows how the peak of a Maxwellian may be shifted to a higher energy by adsorption with only a small increase in the effective neutron temperature. (auth)
- Research Organization:
- Gt. Brit. Atomic Energy Research Establishment, Harwell, Berks, England
- NSA Number:
- NSA-12-002599
- OSTI ID:
- 4318355
- Report Number(s):
- AERE-R/M-133; NPCC/RPWP/P-69
- Country of Publication:
- United Kingdom
- Language:
- English
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