Angular distribution of neutrons from the photodisintegration of deuterium

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A cylindrical target of heavy water approximately the size of a standard water bottle was subject to bremsstrahlung photons with an end point energy of 10.5 MeV. Ideal detectors with a width of 6" and height of 30" were placed 150 cm from the target at angles ranging from 0 to 180 degrees (relative to the beam axis). Here is a top down view of the simulation geometry:

Here is a histogram of the direction cosine with the beam axis of neutrons produced by photons. The [math]P_{\mu}[/math]'s are the Legendre expansion coefficients.

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