INTEGRAL REACTION RATES AND NEUTRON ENERGY SPECTRA IN A WELL MODERATED REACTOR
Cadmium ratio measurements in the internal reflector of MOATA were made with gold, indium, tungsten, manganese, molybdenum, and copper detectors. These measurements were analyzed on the assumption that the neutron spectrum consists of a Maxwellian distribution to which is smoothly joined a 1/E slowing down spectrum, the cross sections being averaged according to the methods of Westcott. A search through recent literature suggests that the s factors for gold and indium listed by Westcott are in error. If this is accepted, then it appears that the measured epithermal spectrum is closely 1/E in form for neutron energies between 1 and 600 ev. The corrections to be applied when foils of finite thickness are used in cadmium ratio measuremerts are discussed, and the spectrum derived from these measurements was used to calculate reaction rate ratios of copper: indium and copper: gold alloy foils. These ratios were compared with measured values. Values of the effective resonance integral of Pt/sup 198/ wire detectors were measured, and from these values an estimate was made of the infinitely dilute resonance integral of this isotope. (auth)
- Research Organization:
- Atomic Energy Commission Research Establishment, Lucas Heights, New South Wales (Australia)
- NSA Number:
- NSA-17-031669
- OSTI ID:
- 4696660
- Report Number(s):
- AAEC/TM-191
- Country of Publication:
- Australia
- Language:
- English
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Related Subjects
CADMIUM
COPPER
COPPER ALLOYS
CROSS SECTIONS
DETECTION
ENERGY
EPITHERMAL NEUTRONS
ERRORS
FOILS
GOLD
GOLD ALLOYS
INDIUM
INDIUM ALLOYS
MANGANESE
MEASURED VALUES
MOATA
MODERATORS
MOLYBDENUM
NEUTRONS
PLATINUM 198
REACTOR TECHNOLOGY
REACTORS
RESEARCH REACTORS
RESONANCE ESCAPE PROBABILITY
SLOWDOWN
SPECTRA
THERMAL NEUTRONS
TUNGSTEN
WIRES