Two hydrogen nuclei, or protons-depicted here in red-fuse and form the
nucleus of an isotope of hydrogen, deuterium, which has one proton and one
neutron-depicted as light-blue.
And when the positively charged proton changes into a neutron, one of the protons emits a positive particle, a positron-green-and a low-energy
neutrino-blue.
Next, the positively-charged positron collides with a negatively charged
electron-also red to show its positive charge-and they annihilate each other
in a matter-antimatter reaction, becoming pure energy at gamma ray
wavelengths-bright white and purple.