Integral P(r) Normalization: Find Constant

[alfredbester]

p(r) is proportional too (1/r)Exp(-r/R). r is the variable.

I'm trying to normalise this function (R is proton radius), so I'm trying to get the integral between infinity and -infinity = 1 so I can find the normalisation constant. I don't know how to do this integral I've tried by parts but it seems there are discontuinities. I'm probably missing something obvious, can sombody point me on the right track?

 

[Pyrrhus]

Non-elementary solution.

http://mathworld.wolfram.com/ExponentialIntegral.html"

 

[alfredbester]

Thanks, I can't see how to normalise this function however.

 

[jpr0]

Probably you're integrating from $r=0$ to $r=\infty$, not over the whole range of r.