Question: Assuming that the particles in Problem 18.1 that react are removed from the beam, use the result of that problem to show that the beam

Assuming that the particles in Problem 18.1 that react are removed from the beam, use the result of that problem to show that the beam current falls exponentially I(z) = I₀e^−z/λ through the target. Find an expression forλ, which is the mean free path of the particles passing through the target.

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