Difference between revisions of "D2O photodisintegration simulation"
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| − | Neutron yield (<math>4\pi</math>) from <math>D_2O</math> (90%<math>D_2</math> concentration) in reaction <math>O16(\gamma,n)O15</math> is presented below. 410 neutrons initially produced got absorbed in the target (E=0MeV) and 2509 neutrons will likely escape the target. Figure in blue on the left is the total energy spectrum of neutrons created in reaction <math>O16(\gamma,n)O15</math>. Figure in blue on the right is the neutron energy spectrum with energy cut applied. | + | Neutron yield (<math>4\pi</math>) from <math>D_2O</math> (90%<math>D_2</math> concentration) in reaction <math>O16(\gamma,n)O15</math> is presented below. Initially <math>5\cdot 10^7</math> brem photons with 25 MeV end-point energy were thrown on the target. 410 neutrons initially produced got absorbed in the target (E=0MeV) and 2509 neutrons will likely escape the target. Figure in blue on the left is the total energy spectrum of neutrons created in reaction <math>O16(\gamma,n)O15</math>. Figure in blue on the right is the neutron energy spectrum with energy cut applied. |
[[File:O16_neutron_yield.gif | 500 px]] [[File:O16_neutron_yield_cut.gif | 500 px]] | [[File:O16_neutron_yield.gif | 500 px]] [[File:O16_neutron_yield_cut.gif | 500 px]] | ||
| − | Neutron yield (<math>4\pi</math>) from <math>D_2O</math> (90%<math>D_2</math> concentration) in reaction <math>D_2(\gamma,n)p</math> is presented below. 857 neutrons initially produced got absorbed in the target (E=0MeV) and 16799 neutrons will likely escape the target. Figure in black on the left is the total energy spectrum of neutrons created in reaction <math>D_2(\gamma,n)p</math>. Figure in blue on the right is the neutron energy spectrum with energy cut applied. | + | Neutron yield (<math>4\pi</math>) from <math>D_2O</math> (90%<math>D_2</math> concentration) in reaction <math>D_2(\gamma,n)p</math> is presented below. Initially <math>5\cdot 10^7</math> brem photons with 25 MeV end-point energy were thrown on the target. 857 neutrons initially produced got absorbed in the target (E=0MeV) and 16799 neutrons will likely escape the target. Figure in black on the left is the total energy spectrum of neutrons created in reaction <math>D_2(\gamma,n)p</math>. Figure in blue on the right is the neutron energy spectrum with energy cut applied. |
[[File:D2_neutron_yield2.gif | 500 px]] [[File:D2_neutron_yield_cut.gif | 450 px]] | [[File:D2_neutron_yield2.gif | 500 px]] [[File:D2_neutron_yield_cut.gif | 450 px]] | ||
So, if we apply the energy cut in neutron spectrum which is a sum of neutrons coming from <math>O16(\gamma,n)O15</math> and <math>D_2(\gamma,n)p</math> reactions at (0MeV)<E<=5MeV, then the ratio of unpolarized photons from <math>O16(\gamma,n)O15</math> and polarized photons from <math>D_2(\gamma,n)p</math> will be <math>855/15128=0.056</math>. In the same time we will loose <math>(16799-15128)/15128=11%</math> of the "good" neutrons produced in <math>D_2(\gamma,n)p</math> reaction. | So, if we apply the energy cut in neutron spectrum which is a sum of neutrons coming from <math>O16(\gamma,n)O15</math> and <math>D_2(\gamma,n)p</math> reactions at (0MeV)<E<=5MeV, then the ratio of unpolarized photons from <math>O16(\gamma,n)O15</math> and polarized photons from <math>D_2(\gamma,n)p</math> will be <math>855/15128=0.056</math>. In the same time we will loose <math>(16799-15128)/15128=11%</math> of the "good" neutrons produced in <math>D_2(\gamma,n)p</math> reaction. | ||
Revision as of 01:36, 11 April 2011
The result of GEANT4 simulation of neutron photoproduction on deuterium and oxygen-16 is presented below:
Neutron yield () from (90% concentration) in reaction is presented below. Initially brem photons with 25 MeV end-point energy were thrown on the target. 410 neutrons initially produced got absorbed in the target (E=0MeV) and 2509 neutrons will likely escape the target. Figure in blue on the left is the total energy spectrum of neutrons created in reaction . Figure in blue on the right is the neutron energy spectrum with energy cut applied.
Neutron yield () from (90% concentration) in reaction is presented below. Initially brem photons with 25 MeV end-point energy were thrown on the target. 857 neutrons initially produced got absorbed in the target (E=0MeV) and 16799 neutrons will likely escape the target. Figure in black on the left is the total energy spectrum of neutrons created in reaction . Figure in blue on the right is the neutron energy spectrum with energy cut applied.
So, if we apply the energy cut in neutron spectrum which is a sum of neutrons coming from and reactions at (0MeV)<E<=5MeV, then the ratio of unpolarized photons from and polarized photons from will be . In the same time we will loose of the "good" neutrons produced in reaction.