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- W2018180745 abstract "Invariant imbedding theory is an alternative formulation of particle transport theory. Although stochastic foundations of invariant imbedding have been known from the beginnings, the method itself has so far exclusively been used for calculating first moments, i.e. expectations. The present paper attempts to set up a probability balance equation in the invariant imbedding approach from which equations for the first and second order densities are derived. It is shown that only the equations for the first order densities are non-linear, while subsequent order densities obey linear equations. This is expected to considerably simplify solution to those problems which involve second order density calculations where invariant imbedding techniques may be profitably used. Examples of such quantities are the variance or correlations between particles detected at two different energies or angles or the higher moments of the emitted multiplicity distribution such as the variance from a target bombarded by incident particles. One possible area of application of our equations is non-destructive estimation of fissile material by the active neutron assay technique. Another area is the study of particle cascade development in sputtering and positron backscattering from surfaces. The approach is illustrated by a simple forward–backward scattering model for these two problems." @default.
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- W2018180745 date "2009-08-01" @default.
- W2018180745 modified "2023-10-12" @default.
- W2018180745 title "Stochastic equations in the invariant imbedding formulation of particle transport" @default.
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- W2018180745 doi "https://doi.org/10.1016/j.anucene.2009.05.004" @default.
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