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P+P=Deuterium? how?

  1. Jun 5, 2010 #1
    In this Picture: http://upload.wikimedia.org/wikipedia/commons/7/78/FusionintheSun.svg at the beginning, two protons collide and create a Deuterium.
    But from the other left-over's we can see that a Beta minus decay has occurred to one of the protons.
    So it means that one proton decayed and then collided with the proton?
    Or the collision made the proton decay?
     
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  3. Jun 5, 2010 #2

    Astronuc

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    Staff: Mentor

    The proton transmutation is considered to happen at the time of collision. It's a positron emission with an electron associated neutrion that is emitted via a weak process.

    http://hyperphysics.phy-astr.gsu.edu/Hbase/astro/procyc.html#c4
     
  4. Jun 5, 2010 #3

    Meir Achuz

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    My guess is that those pictures are meant to show why the strong tritium reaction is the dominant one. The d+d reaction requires a photon, so it is EM. The p+p requires a neutrino, so it is weak.
     
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