Abstract
The very neutron-deficient 117Ba nuclei were produced in 58Ni-induced reactions on a 63Cu target and selected for spectroscopic studies by using BaF+ molecules formed in the ion source of the GSI on-line mass separator. The β-decay of 117Ba was investigated by means of the total absorption γ-ray spectrometer and a telescope for β-delayed particle detection. In the analysis combining the β-delayed γ-ray and proton data the energy window available for β-delayed proton emission, the branching ratios for proton transitions to the 116Xe levels and the β-feeding of the γ-ray and proton-emitting 117Cs states were determined. The β-strength function for 117Ba derived from the measured β-feeding distribution revealed the existence of a broad resonance structure at 117Cs excitation energy of about 4-5 MeV. The results of the β-delayed proton studies and β-strength measurements are confronted with theoretical predictions.
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