Neutron pinball

The Simulation

Photons with a Bremsstrahlung energy distribution are incident upon 64 4 mm dia. thorium cylinders with 1 cm center to center spacing (see the neutron flux plot below). Photofission neutrons were simulated using the MCNPX ACE model, since photofission cross section libraries do not exist for thorium. Upon the creation of a neutron, its initial direction of travel is logged and compared with its direction of travel when it leaves the simulation area.

Prompt neutron flux from photofission

232

Go back Elastic scattering