How to Solve a Pair Annihilation Problem for the Energy of Resulting Particles?

[CollectiveRocker]

Does anyone know how to solve a pair annihilation problem ( positron and electron), for the energy of the resulting particles, in this case photons?

 

[Gonzolo]

Yes, I would believe that many people here can do that, perhaps even myself.

 

[zefram_c]

We certainly do, but we don't do other people's homework here. Try asking your particular problem in the homework help forum, along with some information on how far you got and where you got stuck.

 

[CollectiveRocker]

I attempted to use the relativistic version of kinetic energy: mc^2(gamma - 1), and solved for gamma. I then put that answer into the relatistic equation for momentum, p = gamma * mv; took that answer and put it into E = pc. That is where i got confused, for the answer was incorrect. The thing which throws off the entire problem is that the electron is at rest when the positron hits it. Any advice?

 

[zefram_c]

We need more information than this to help you. What quantities are you given and what are you asked to determine?

 

[marlon]

And keep in mind that collision-problems are solved using conservation of energy and momentum


regards
marlon

 

[CollectiveRocker]

I have solved the problem with conservation of energy and momentum. Thank you fellas.