Tritium is an isotope of hydrogen whose nucleus triton contains 2 neutrons and 1 proton . Free neutrons decay into `p+bar(e) +bar(n).` If one of the neutrons in Triton decays , it would transform into `He^(3)` nucleus. This does not happen. This is because

Options

A. Triton energy is less than that of a `He^3` 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 `He^3` nucleus.
D. because free neutrons decay due to external perturbations which is absent in a triton nucleus.

Explanation

Triton energy is less than that of a `He^3` nucleus. The correct option is (a).