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Tritium is an isotope of hydrogen whose nucleus Triton contains 2 neutrons and 1 proton. Free neutrons decay into p + bar e + bar ν . If one of the neutrons in Triton decays, it would transform into He3 nucleus. This does not happen. This is because 

(a) Triton energy is less than that of a He3 nucleus. 

(b) the electron created in the beta decay process cannot remain in the nucleus. 

(c) both the neutrons in triton have to decay simultaneously resulting in a nucleus with 3 protons, which is not a He3 nucleus. 

(d) because free neutrons decay due to external perturbations which is absent in a triton nucleus.

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(a) Triton energy is less than that of a He3 nucleus. 

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