The q-value of 157Tb

Abstract

Using mass-separated and chemically purified samples, the Q-value of 157Tb has been remeasured as 62.9 ± 0.7 keV by determining electron capture ratios. The transition probability to the excited state was found to be (1.1 ± 0.1) × 10 −3, with a transition energy of 8.4 ± 0.7 keV for this branch. From the proximity to the 2s binding energy, experiments on the internal bremsstrahlung electron capture seem feasible. The half-life of 157Tb was remeasured as 99 ± 10 y.