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

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

the electron created in the beta decay process cannot remain in the nucleus

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

Triton energy is less than that of a He³ nucleus.

answer is A.

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Detailed Solution

The nucleus of Tritium $(_{1} H^{3})$ contains 1 proton and 2 neutrons. If a neutron decays as $n \to p + \bar{e} + \bar{v}$ , the nucleus may have 2 protons and one neutron, i.e., tritium will transform into $_{2} {He}^{3}$ (2 protons and 1 neutron).
Triton energy is less than that of $_{2} {He}^{3}$ nucleus. i.e., transformation is not allowed energetically.