Difference between revisions of "Neutron pinball"

From New IAC Wiki
Jump to navigation Jump to search
Line 1: Line 1:
 
==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.

Prompt neutron flux from photofission in thorium cylinders

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.


Non-zero deflection angles of neutrons


Go back Elastic scattering