Difference between revisions of "Yields and Asymmetry versus Energy Cuts."

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[https://wiki.iac.isu.edu/index.php/2n_correlations_in_Photofission go back]
 
[https://wiki.iac.isu.edu/index.php/2n_correlations_in_Photofission go back]
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==2n Asymmetry versus Energy Cut==
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It was been shown by Dr Dale that Asymmetry of 2n correlations (anti-parallel/parallel) is the strong function of energy cuts and increases as energy cut increases.
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[[File:2n energy correlations vs cuts.png | 800px]]
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==Let's see what happens if we increase the energy cuts==
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[[File:2n energy correlations vs cuts more.png | 800px]]
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That I can not explain at present time. Maybe there are some physics or maybe that is just simple statistical fluctuation. Need more investigation.
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[[File:2n yields vs cuts more.png | 800px]]
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The peak is probably due to the energy neutron spectrum (no, there are some code issues, it's appears on about 20 step, do not always at that energy above))
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[[File:2n counts vs cuts more.png | 800px]]
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The peak is probably due to the energy neutron spectrum
  
 
==Summary table of yields and asymmetry versus energy cuts==
 
==Summary table of yields and asymmetry versus energy cuts==
  
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[[File:Table cut yields part1.png | 700px]]
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[[File:Table 2n energy cut yields p01.png | 800px]]
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[[File:Table 2n energy cut yields p02.png | 800px]]
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==Because '''cnts0''' becomes really small quantity we need to analyze errors==
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[[File:2n energy correlations error vs cuts more.png | 800px]]
  
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[[File:Table cut yields part2.png | 700px]]
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To do more investigation I will need more statistics. But that is problematically at present moment due to the lack of hard disk space:
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*10 M events is about 1 Gb file.
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*Say I want 100 times more statistics. I will need about 100 Gb free space

Latest revision as of 15:35, 21 June 2011

go back


Follow are some Monte Carlo simulations of 2n correlations. One neutron are from one FF, two neutrons per fission. No accidental neutron was considered, all neutrons are correlated. Total 10M events was simulated. Every neutron was sampled up to 10 MeV. The polarization of gammas are zero.


2n Asymmetry versus Energy Cut

It was been shown by Dr Dale that Asymmetry of 2n correlations (anti-parallel/parallel) is the strong function of energy cuts and increases as energy cut increases.

2n energy correlations vs cuts.png

Let's see what happens if we increase the energy cuts

2n energy correlations vs cuts more.png

That I can not explain at present time. Maybe there are some physics or maybe that is just simple statistical fluctuation. Need more investigation.


2n yields vs cuts more.png

The peak is probably due to the energy neutron spectrum (no, there are some code issues, it's appears on about 20 step, do not always at that energy above))


2n counts vs cuts more.png

The peak is probably due to the energy neutron spectrum

Summary table of yields and asymmetry versus energy cuts

Table 2n energy cut yields p01.png

Table 2n energy cut yields p02.png

Because cnts0 becomes really small quantity we need to analyze errors

2n energy correlations error vs cuts more.png

To do more investigation I will need more statistics. But that is problematically at present moment due to the lack of hard disk space:

  • 10 M events is about 1 Gb file.
  • Say I want 100 times more statistics. I will need about 100 Gb free space
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