Abstract
The β decay of the one proton hole and one neutron particle neighbor to was investigated at the GSI on-line mass separator by using germanium detectors and a NaI total-absorption spectrometer. On the basis of βγγ coincidences, the decay scheme was established for the first time. The ground-state spin and parity for are discussed by investigating β feeding of levels in and -delayed proton emission to The half-life was remeasured and found to be 5.9(2) s. The value was determined from the measured ratio for the β-delayed protons to be 10.08(23) MeV. The main fraction of the β 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 assign configurations to states in and The GT β-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 GT decay.
- Received 30 July 2002
DOI:https://doi.org/10.1103/PhysRevC.66.044319
©2002 American Physical Society