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Feb 4, 2016 at 15:54 vote accept plzhelp
Feb 3, 2016 at 15:57 comment added rob The probability of finding the incident particle somewhere (neglecting absorption or decay or whatnot) is 1. However the cross section isn't a probability --- for one thing probabilities are dimensionless, while cross sections have units of area. As Jon Custer points out, it's possible for a total integrated cross section to be infinite.
Feb 3, 2016 at 5:28 comment added plzhelp Ok thanks! So just to clarify performing the integral over all solid angles will in fact give 1?
Feb 3, 2016 at 4:53 history answered rob CC BY-SA 3.0