Calculations of Neutron Time-Energy Distributions in Heavy Moderators
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Authors
Williamson, T.J.
Albrecht, R.W.
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Advisors
Date of Issue
1970
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Abstract
The task of making detailed neutronics calculations for heavy moderating isotopes has always been a most difficult problem for a variety of reasons. Consider, for instance, the problem of calculating the time and energy (or lethargy) dependent neutron density N(E,t) that develops in a homogeneous moderator during and following the introduction of a source, S(E,t) in the MeV range. Monte Carlo techniques are very impractical because of the large number of collisions required per history. The usual multi group stepping matrix techniques 1 are inapplicable for at least two reasons: (a) inordinately large matrices are required when collision energy losses are small and (b) scattering through the inelastic region may take but a microsecond while moderation to thermal energies may require times of the order of a millisecond, thus making it virtually impossible to choose a suitable time step upon which to define the matrix.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.13182/NSE70-A19333
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Department
Physics
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Naval Postgraduate School (U.S.)
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4 p.
Citation
Williamson, T. J., and R. W. Albrecht. "Calculations of Neutron Time-Energy Distributions in Heavy Moderators." Nuclear Science and Engineering 42, no. 1 (1970): 97-100.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.