JB Absolute theta
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Beam
I ran an MCNP simulation of a D2O target subject to an 10.5 MeV end-point bremsstrahlung beam, which included the full neutron detector array with detector physics modeling. A Cf252 source was also simulated, allowing me to do a theta_abs calculation in the same manner whether using simulation or experimental data .
MCNP-POLIMI
Below is an MCNP-POLIMI simulation of a cylindrical D20 target (axis length = 2"; dia. = 0.75") subject to a bremsstrahlung photon beam with an end point of 10.5MeV. The plot below shows the relative distribution of neutron direction cosines w.r.t. the incident photon beam. All neutrons are from the photodisintegration of D20 and the direction cosine is taken as neutrons exit the target geometry.
