How we can prove neutron is heavier than proton?
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the "proton decay" process you wrote down is forbidden, precisely because the neutron is heavier than the proton. As you may already know, nucleons are made of quarks; protons (uud) and neutrons (udd) were the masses are 938.3 MeV and 939.6 MeV, respectively.
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to measure there mass on bim balance which is used to measure the mass of proton and neutron
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