# Rutherford Scattering cross section

## Homework Statement

Integrate the rutherford cross section over the backward hemisphere to get 4pi(sigma0(E))

## Homework Equations

Rutherford cross section is sigma0(E)/sin^4(theta/2)

## The Attempt at a Solution

When I integrate this with the limits pi/2 to pi i get sigma0(E)*(8/3) i don't know what i'm doing wrong.

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Are you sure you have your integration limits correct?

I thought so, since the problem says that theta goes between pi/2 and pi i.e. large angle scattering is from 90-180 degrees. I don't see how i'm supposed to get it to be 4pi instead of 8/3.

Never mind my previous response, I was confusing this with a different problem I was solving earlier.

As near as I can tell, your solution appears to be correct.