On the Solution of a Few Problems of Multiple Scattering by Monte Carlo Method; SUR LA SOLUTION DE QUELQUES PROBLEMS DE DIFFUSIONS MULTIPLES PAR LA METHODE DE MONTE-CARLO
Technical Report
·
· Centre d'Etudes Nucleaires
OSTI ID:4551405
Three problems of multiple scattering arising from neutron cross sections experiments, are reported here. The common hypothesis are: - Elastic scattering is the only possible process - Angular distributions are isotropic - Losses of particle energy are negligible in successive collisions. In the three cases practical results, corresponding to actual experiments are given. Moreover the results are shown in more general way, using dimensionless variable such as the ratio of geometrical dimensions to neutron mean free path. The FORTRAN codes are given together with to the corresponding flow charts, and lexicons of symbols. First problem: Measurement of sodium capture cross-section. A sodium sample of given geometry is submitted to a neutron flux. Induced activity is then measured by means of a sodium iodide cristal. The distribution of active nuclei in the sample, and the counter efficiency are calculated by Monte-Carlo method taking multiple scattering into account. Second problem: absolute measurement of a neutron flux using a glass scintillator. The scintillator is a use of lithium 6 loaded glass, submitted to neutron flux perpendicular to its plane faces. If the glass thickness is not negligible compared with scattering mean free path lambda, the mean path e' of neutrons in the glass is different from the thickness. Monte-Carlo calculation are made to compute this path and a relative correction to efficiency equal to (e' - e)/e. Third problem: study of a neutron collimator. A neutron detector is placed at the bottom of a cylinder surrounded with water. A neutron source is placed on the cylinder axis, in front of the water shield. The number of neutron tracks going directly and indirectly through the water from the source to the detector are counted. (author)
- Research Organization:
- Commissariat a l'Energie Atomique, Cadarache (France)
- NSA Number:
- NSA-20-026062
- OSTI ID:
- 4551405
- Report Number(s):
- CEA-R-2971
- Country of Publication:
- France
- Language:
- English
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