Difference between revisions of "Neutron pinball"
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==The Simulation== | ==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. 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. The target configuration pictured below is surrounded by a r=100cm cylinder of air(axis going into the page). All cylinders have a height of 76 cm. | + | 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. 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. The target configuration pictured below is surrounded by a r=100cm cylinder of air(axis going into the page). All cylinders have a height of 76 cm. |
[[File:Neutronflux.png|400 px|thumb|center|Prompt neutron flux from photofission in thorium cylinders]] | [[File:Neutronflux.png|400 px|thumb|center|Prompt neutron flux from photofission in thorium cylinders]] | ||
Revision as of 02:32, 29 January 2016
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. 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. The target configuration pictured below is surrounded by a r=100cm cylinder of air(axis going into the page). All cylinders have a height of 76 cm.
Result
14.5% of neutrons scattered in the thorium cylinders alone, and 16.5% when the air was included. The histogram below shows that if a neutron was deflected, it most likely did so at an unacceptable angle.
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