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Unformatted text preview: ith energy E0. For particles of this energy, the slab
is τ mean free paths thick in the x dimension. What fraction of the particles escapes the
slab without undergoing a collision? Your final answer should be a function only of τ,
and you should be able to express it in terms of τ and/or one or more exponential integrals
of τ, En(τ), where
τ n−1 ∫ dt n e−t
En (τ ) ≡ ∫ d µµ n−2e −τ / µ = .
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- Spring '09