Gamma Emission Keeps the Nucleus Identity

Gamma emission lowers a training energy ledger without changing A or Z. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

A gamma step keeps A 12 and Z 6 unchanged in this ledger.

A:12=12\quad Z:6=6

The gamma photon carries the energy drop

The training energy ledger drops from 9 joules to 6 joules, so gamma carries 3 joules.

9-6=3\ \mathrm{J}