Abstract
An earlier publication “The implication of the atomic effects in neutrinoless double beta (0νββ) decay” written by Mei and Wei has motivated us to compare the decay Q value (Qββ) derived from the decay of the parent nucleus to the daughter nucleus with the two ejected beta particles in the final state to the Qββ directly derived from the decay of the initial neutral atom to the final state of double-ionized daughter ion with the two ejected beta particles in the final state. We show that the results are the same, which is the mass-energy difference (ΔMc2) subtracted by the total difference of the atomic electron binding energy (ΔEb) between the ground states of initial and final neutral atoms. We demonstrate that ΔMc2 is the sum of Qββ and the atomic relaxation energy (ΔEb) of the atomic structure after the decay. Depending on the atomic relaxation time, the release of the atomic binding energy may not come together with the energy deposition of the two ejected beta particles.
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