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- PROTON-PROTON REACTION
-
- In a proton-proton reaction, two protons collide and one becomes a neutron, which, together with the proton, forms the
- heavy isotope of hydrogen called deuterium. Once again, a free proton collides with it. Now the result is the light
- helium 3 (helium minus one neutron). Next, two light helium nuclei fuse together, making one helium atom and two
- free protons. During this process 0.7 percent of the mass 'disappears'. Actually, according to the law E=mc2 the mass
- has not disappeared, but has turned into energy.
-