Editing Proton–proton chain (section)

===The {{nowrap|p–p I}} branch===<!-- Autogenerated using Phykiformulae 0.11 by [[User:SkyLined]]
He-3 + He-3 → He-4 + 2H + 12.86 MeV
-->
:{| border="0"
|- style="height:2em;"
|{{nuclide|link=no|helium|3}}&nbsp;||+&nbsp;||{{nuclide|link=no|helium|3}}&nbsp;||→&nbsp;||{{nuclide|link=yes|helium|4}}&nbsp;||+&nbsp;||2&nbsp;{{nuclide|link=no|hydrogen|1}}&nbsp;||+&nbsp;||{{val|12.859|u=MeV}}
|}

The complete chain releases a net energy of {{val|26.732|u=MeV}}<ref>{{cite book|last1=LeBlanc|first1=Francis|title=An Introduction to Stellar Astrophysics}}</ref> but 2.2 percent of this energy (0.59 MeV) is lost to the neutrinos that are produced.<ref>{{cite journal|last1=Burbidge|first1=E. |last2=Burbidge |first2=G. |last3=Fowler |first3=William |last4= Hoyle |first4=F. |title=Synthesis of the Elements in Stars|journal=Reviews of Modern Physics|date=1 October 1957|volume=29|issue=4|pages=547–650|doi=10.1103/RevModPhys.29.547|bibcode= 1957RvMP...29..547B|doi-access=free|url=https://authors.library.caltech.edu/records/bpgfm-dsq46/files/BURrmp57.pdf?download=1}}</ref>
The {{nowrap|p–p I}} branch is dominant at temperatures of 10 to {{val|18|ul=MK}}.<ref name=":1">{{Cite book |last=Iliadis |first=Christian |url=https://www.worldcat.org/oclc/908071061 |title=Nuclear physics of stars |date=2015 |isbn=978-3-527-33649-4 |edition=Second, revised and enlarged |location=Weinheim, Germany |oclc=908071061}}</ref>
Below {{val|10|u=MK}}, the {{nowrap|p–p}} chain proceeds at slow rate, resulting in a low production of {{SimpleNuclide|Helium|4}}.<ref>{{Cite journal |title=Solar fusion cross sections. II. Theppchain and CNO cycles |date=2010|doi=10.1103/RevModPhys.83.195 |arxiv=1004.2318 |last1=Adelberger |first1=E. G. |last2=García |first2=A. |last3=Robertson |first3=R. G. Hamish |last4=Snover |first4=K. A. |last5=Balantekin |first5=A. B. |last6=Heeger |first6=K. |last7=Ramsey-Musolf |first7=M. J. |last8=Bemmerer |first8=D. |last9=Junghans |first9=A. |last10=Bertulani |first10=C. A. |last11=Chen |first11=J.-W. |last12=Costantini |first12=H. |last13=Prati |first13=P. |last14=Couder |first14=M. |last15=Uberseder |first15=E. |last16=Wiescher |first16=M. |last17=Cyburt |first17=R. |last18=Davids |first18=B. |last19=Freedman |first19=S. J. |last20=Gai |first20=M. |last21=Gazit |first21=D. |last22=Gialanella |first22=L. |last23=Imbriani |first23=G. |last24=Greife |first24=U. |last25=Hass |first25=M. |last26=Haxton |first26=W. C. |last27=Itahashi |first27=T. |last28=Kubodera |first28=K. |last29=Langanke |first29=K. |last30=Leitner |first30=D. |journal=Reviews of Modern Physics |volume=83 |pages=195–245 |s2cid=119117147 |display-authors=1 }}</ref>