Caption: The iron stack which forms the proton decay experiment at Frejus, France. The stack consists of iron bars interspersed with geiger tubes, and is designed to provide enough protons to bring the probability of observing a decay event into realistic proportions, made difficult by the half- life of the proton being ten to the power 34 years. The decay of the proton is predicted by most Grand Unified theories of the fundamental forces (electromagnetic, strong nuclear and weak nuclear), but has yet to be confirmed by any experiment. The detector is based under the Alps to provide shielding from cosmic rays.
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