For example, for spontaneous decays of 132Cs, 98.1% are ε or β+ decays, and 1.9% are β− decays. The partial decay constants can be calculated from the branching fraction and the half-life of 132Cs (6.479 d), they are: 0.10 d−1 (ε + β+) and .0020 d−1 (β−). The partial half-lives are 6.60 d (ε + β+) and 341 d (β−). Here the proble...