Cos(Theta) between two correlated neutrons. Unpolarized case.

Below is the energy spectrum of two correlated neutrons in LAB frame. 10 million events. Sampled up to 10 MeV.

Below is [math]cos(\Theta)[/math] between two correlated neutron. No energy cut was made. Integrated over all energy spectrum.

Below is [math]cos(\Theta)[/math] between two correlated neutron. Energy cut was made for each neutrons [math]E_n \gt 2\ MeV[/math]. Integrated over all energy spectrum.

[math]Asymmetry = \frac{2n\ \downdownarrows}{2n\ \downpdownarrows}[/math]