Beta decay of 100In

The beta decay of 100In, the one proton hole and one neutron particle neighbor to 100Sn, was investigated at the GSI on-line mass separator by using germanium
detectors and a NaI total-absorption spectrometer. On the basis of bgg coincidences, the 100In decay scheme was established for the first time. The ground-state spin and parity for 100In are discussed by investigating beta feeding of levels in 100Cd and beta-delayed proton emission to 99Ag. The half-life was remeasured and found to be 5.9(2) s. The Q-EC value was determined from the measured EC/beta+ ratio for the beta-delayed protons to be 10.08(23) MeV. The main fraction of the
beta feeding was established to populate the region of 6 MeV excitation energy, which corresponds
to a total Gamow-Teller (GT) strength of 3.9(9) and a centroid at 6.4 MeV. Large-scale shell-model calculations employing a realistic interaction are used to a
ssign configurations to states in 100In and 100Cd. The GT beta-decay strength distribution measured in the total absorption experiment is compared to shell-model
predictions. The deduced overall hindrance of the GT strength agrees with the values predicted for the 100Sn GT decay.