Internal conversion coefficient

In nuclear physics, the internal conversion coefficient describes the rate of internal conversion. The internal conversion coefficient may be empirically determined by the following formula: α = number of de-excitations via electron emission number of de-excitations via gamma-ray emission {\displaystyle \alpha ={\frac {\text{number of de-excitations via electron emission}}{\text{number of de-excitations via gamma-ray emission}}}} There is no valid formulation for an equivalent concept for E0 (electric monopole) nuclear transitions.

Source: Wikipedia — Internal conversion coefficient (CC BY-SA 4.0)