Detect pion created from cosmic-ray

Thank you for reply and good reference link Angelo :).

Actually, I interested in both PION+ & PION-. Attached image and my description are not equal. Sorry for the confusion.

I have an additional question that arises after looking at the sum.lis file. USRTRACK estimator get parameter about detector volume. In manual, default volume is 1 cm^3, If I add number, volume is that number.
but in sum.lis file, volume is not equal to value that I input.
Specifically, it is as follows.

  1. region:@ALLREGS, volume:1.0 → volume on sum.lis : 1.81029899E-19
  2. region:@ALLREGS, volume:8.16228E24 → volume on sum.lis : 1477616.75

In this step. vol 2 / vol 1 = 8.16228E24 exactly. In this moment I think there is some eigen unit volume proportional 1.81029899E-19.
But next step, I confused.

  1. region:Air001, volume:1.0 → volume on sum.lis : 143859.734

It is not equal to 1.

The fluka course I saw said that the estimator not measure the volume. So, input some volume in USRTRACK, it will be normalized to that volume. I think volume is not depend on region. But maybe it wasn’t. How to define volume on sum.lis ? And what kind of relationship between volume and region and volume on sum.lis works? I haven’t been able to find this in the fluka manual yet.

thanks regards.