Editing Proton–proton chain (section)

===The {{nowrap|p–p III}} branch===
[[File:Proton-Proton III chain reaction.svg|thumb|Proton–proton III chain]]
<!-- Autogenerated using Phykiformulae 0.11 by [[User:SkyLined]]
He-3 + He-4 → Be-7 + y
Be-7 + H → B-8 + y
B-8 _ _ → Be-8 + e+ + ve
Be-8 _ _ → 2He
-->:{| border="0"
|- style="height:2em;"
|{{nuclide|link=yes|helium|3}}&nbsp;||+&nbsp;||{{nuclide|link=yes|helium|4}}&nbsp;||→&nbsp;||{{nuclide|link=yes|beryllium|7}}&nbsp;||+&nbsp;||{{math|{{SubatomicParticle|link=yes|Gamma}}}}&nbsp;||&nbsp;||&nbsp;||+&nbsp;||{{val|1.59|u=MeV}}
|- style="height:2em;"
|{{nuclide|link=yes|beryllium|7}}&nbsp;||+&nbsp;||{{nuclide|link=yes|hydrogen|1}}&nbsp;||→&nbsp;||{{nuclide|link=yes|boron|8}}&nbsp;||+&nbsp;||{{math|{{SubatomicParticle|link=|Gamma}}}}
|- style="height:2em;"
|{{nuclide|link=yes|boron|8}}&nbsp;||&nbsp;||&nbsp;||→&nbsp;||{{nuclide|link=yes|beryllium|8}}&nbsp;||+&nbsp;||{{SubatomicParticle|link=yes|Positron}}&nbsp;||+&nbsp;||{{SubatomicParticle|link=yes|Electron Neutrino}}&nbsp;||
|- style="height:2em;"
|{{nuclide|link=yes|beryllium|8}}&nbsp;||&nbsp;||&nbsp;||→&nbsp;||2&nbsp;{{nuclide|link=yes|helium|4}}
|}

The last three stages of this chain, plus the positron annihilation, contribute a total of 18.209&nbsp;MeV, though much of this is lost to the neutrino.

The {{nowrap|p–p III}} chain is dominant if the temperature exceeds {{val|25|u=MK}}.<ref name=":1" />

The {{nowrap|p–p III}} chain is not a major source of energy in the Sun, but it was very important in the [[solar neutrino problem]] because it generates very high energy neutrinos (up to {{val|14.06|u=MeV}}).