Anisotropic n's vs. isotropic ones

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"The observation were consistent with the assumption that anisotropic fission is due solely to photons with-in about 3 MeV of the fission threshold".

Winhold and Halpern, Phys.Rev. 103 4, 990 (1956)

Say we have only anisotropic neutrons

[math]\Theta = 0^o:\ 100\ n's[/math]

[math]\Theta = 90^o:\ 125\ n's[/math]

So the calculated asymmetry would be:

[math]A = \frac{125}{100} = 1.25[/math]