1. Sep 16, 2005 #1

   Ratzinger

   

   In pair production, an nucleus is needed to take away some momentum from the photon so momentum conservation is respected. correct?

    

   Ratzinger, Sep 16, 2005
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3. Sep 16, 2005 #2

   jtbell

   

   Staff: Mentor

   Right. Or at least a heavy charged particle. It's just that a nucleus is the most common such beast.

    

   jtbell, Sep 16, 2005
4. Sep 16, 2005 #3

   mathman

   

   Science Advisor

   Gold Member

   There is an alternative way for pair production to take place - it happened right after the big bang. Specifically, a pair of photons can interact to get a particle-antiparticle pair.

    

   mathman, Sep 16, 2005

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