THE SLOWING-DOWN SPECTRUM IN HETEROGENEOUS REACTORS
Technical Report
·
OSTI ID:4073495
Resonance detectors were used to measure fluxes at several energies in the slowing-down spectrum in ZEEP through NPD-type cells, NRX-type cells, through vacancies, and through the graphite reflector. The measurements were normalized to spectra obtained from 20-group age-diffusion calculations, snd the agreement between theory and experiment is satisfactory. Deviations of the spectra from the l/E-form arise from two causes: resonance capture causes depressions in the flux near the uranium, and the spatial non-uniformity of the fission sources causes an excess of high-energy neutrons close to the rod and a deficit at the cell boundary. Spectral uncertainties are seen to cause appreciable errors in calculating resonance absorption in lattices. (auth)
- Research Organization:
- Atomic Energy of Canada Ltd., Chalk River, Ont.
- NSA Number:
- NSA-15-021721
- OSTI ID:
- 4073495
- Report Number(s):
- CRRP-1006; AECL-1228
- Country of Publication:
- Canada
- Language:
- English
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