Difference between revisions of "Cos(Theta) between two correlated neutrons. Unpolarized case."
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− | And with | + | |
+ | |||
+ | And with energy cut. | ||
[[File:Cos theta 2n correlated energy cut.png | 700 px]] | [[File:Cos theta 2n correlated energy cut.png | 700 px]] | ||
− | :<math>Asymmetry = \frac{counts\ cos(\ | + | The calculated asymmetry between neutron emitted in one direction and in opposite directions is: |
+ | |||
+ | :<math>Asymmetry = \frac{counts anti-parallel}{counts\ parallel} = frac{209,578}{3,219} = 65.11</math> | ||
+ | |||
+ | here: | ||
+ | *count anti-parallel are all events with angle between two neutron is <math>cos(\Theta_{nn}) < -0.9</math> that is large enough angle <math>\Theta = (180\pm25)^o<math> | ||
+ | *count parallel are all events with angle between two neutron is <math>cos(\Theta_{nn}) > 0.9</math> that is large enough angle <math>\Theta = (0\pm25)^o<math> | ||
+ | |||
+ | |||
:<math>Energy\ Cut\ Yield \frac{counts\ with\ cut}{counts\ without\ cut} = \frac{1,227,505}{10,000,000} = 0.12277</math> | :<math>Energy\ Cut\ Yield \frac{counts\ with\ cut}{counts\ without\ cut} = \frac{1,227,505}{10,000,000} = 0.12277</math> | ||
− | :<math>Asymmetry\ Yield \frac{(counts\ parallel) + (counts\ | + | :<math>Asymmetry\ Yield \frac{(counts\ anti-parallel) + (counts\ particle)}{event\ without\ cut} = \frac{209,578 + 3,219}{10,000,000} = 0.02128</math> |
Looks good, but we need big statistics! | Looks good, but we need big statistics! |
Revision as of 17:10, 10 June 2011
Below is the energy spectrum of two correlated neutrons in LAB frame. 10 million events. Sampled up to 10 MeV.
Below is
between two correlated neutron. No energy cut was made. Integrated over all energy spectrum.
And with energy cut.
The calculated asymmetry between neutron emitted in one direction and in opposite directions is:
here:
- count anti-parallel are all events with angle between two neutron is that is large enough angle that is large enough angle
Looks good, but we need big statistics!