Zenith angle distribution sampling in CRY

Hi,everyone, I used CRY to generate muon then statistics incoming angle distribution. I found that the number of muon is most at ~35 degree, which is contradict with the theory of I=I0cos(theta)^2. Some articles said it is caused by solid angle effect, but i am still confusing which zenith angle have most muon, 0 or 35 degree?

1 Like

Yes, it is a solid angle effect. Or perhaps more accurately, a phase space effect. The solid angle is proportional to theta^2, so a constant distribution in solid angle comes out as a proportional to theta at small angles. It is more customary to bin in cos(theta).

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.