THEORETICAL EVALUATION OF SELF-SHIELDING FACTORS DUE TO SCATTERING RESONANCES IN FOILS
A semi-analytical method is given for evaluating selfshielding factors for activation measurements which use thin foils having neutron scattering resonances. The energy loss by scattering in the foil is taken into account. The energy-dependent neutron angular distribution is expanded as a double series, the coefficients of which are (energy dependent) solutions of an infinite set of coupled integral equations. These are truncated in some suitable manner and solved numerically. The leading term of the series is proportional to the average, or effective flux in the activation sample. The product of this term and the neutron capture cross-section is integrated numerically over the resonance to give the resonance self-shielding correction. Resonance self- shielding factors derived in this manner for the 132 ev resonance in Co/sup 59/ and for the two Mn/sup 55/ resonances at 337 and 1080 ev are shown. Self- shielding factors for l/v capture are not significantly different from unity. (auth)
- Research Organization:
- Atomic Energy of Canada Ltd. Chalk River Project, Chalk River, Ont.
- NSA Number:
- NSA-15-002141
- OSTI ID:
- 4135078
- Report Number(s):
- CRT-927; AECL-1077
- Country of Publication:
- Canada
- Language:
- English
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RESONANCE INTEGRALS AND SELF-SHIELDING FACTORS FOR DETECTOR FOILS