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## Main Question or Discussion Point

Let's try something simple and hope this goes better than my last two threads. :( The problem can be stated thusly:

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Given thermal neutrons emitted at a source S interacting with a mean interaction length of L and an evaluation point P distance d away from S, what is the average number of interactions that a neutron measured at P will have experienced before reaching there? Assume that the interaction length does not change during its interactions.

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It's easy in the case where one assumes monoenergetic neutrons emitted directly towards P and leaving each collision on the same path; however, that's not the real world where particles progress with brownian motion and may well end up heading back toward S, off at an angle, etc.

As an alternative: if anyone knows of any good software for simulating neutron interactions so that I don't have to calculate everything by hand...

----

Given thermal neutrons emitted at a source S interacting with a mean interaction length of L and an evaluation point P distance d away from S, what is the average number of interactions that a neutron measured at P will have experienced before reaching there? Assume that the interaction length does not change during its interactions.

----

It's easy in the case where one assumes monoenergetic neutrons emitted directly towards P and leaving each collision on the same path; however, that's not the real world where particles progress with brownian motion and may well end up heading back toward S, off at an angle, etc.

As an alternative: if anyone knows of any good software for simulating neutron interactions so that I don't have to calculate everything by hand...

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