Illustration of a nuclear fusion process with two protons (proton-proton chain reaction). Hereby one deuterium nucleus results, consisting of a proton and a neutron. Before fusion, the proton decays in a positron (e+), a electron neutrino and a neutron.
<a href="//commons.wikimedia.org/wiki/User:Yikrazuul" title="User:Yikrazuul">Yikrazuul</a>
<span class="int-own-work" lang="en">Own work</span>; parts used from <a href="//commons.wikimedia.org/wiki/File:Wpdms_physics_proton_proton_chain_1.svg" title="File:Wpdms physics proton proton chain 1.svg">Wereon's work</a>