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Is free neutron a stable particle ? If n...

Is free neutron a stable particle ? If not, what is its mode of decay?

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No, free neurton is not a stable particle. Its mean life is about 1000 second. It decays into a proton, an electron and an antineutrino.
`._0n^1 to ._1H^1+._-1e^0+barv`
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