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Gamma Decay

The decay of a nucleus emitting a gamma ray (

γ

), a high-energy photon, following an excited state transition.

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The statement of the theorem

Let

E_i

and

E_f

be the energy eigenvalues of the initial and final excited states of the nucleus, respectively. The transition probability rate

\Gamma_{i\to f}

for the emission of a photon

\gamma

with energy

E_{\gamma}

is given by the Fermi's Golden Rule approximation, leading to the energy conservation relation:\n

E_{\gamma} = E_i - E_f

Source: Wikipedia