BETA-DECAY OF THE PROTON-RICH T-Z=-1 2 NUCLEUS, KR-71/

beta decay of the T-z=-1/2 nuclide Kr-71 has been studied at the ISOLD E PSB Facility at CERN. Kr-71 ions were produced in spallation reactio ns in a Nb foil using the 1 GeV proton beam and studied by means of be ta-delayed proton, beta- and gamma-ray spectroscopy. The half-life and the beta-decay energy of Kr-71 were determined using the decay of pro tons and positrons. These results: T-1/2=100+/-3 ms and Q(EC)=10.14+/- 0.32 MeV and the first observation of the beta branch to the 207 keV l evel in Br-71 makes the extension of the systematics of Gamow-Teller m atrix elements of mirror nuclei up to A=71 possible. The Gamow-Teller strength of the same magnitude as that of the fp-shell mirror nuclei i s observed for the ground-state transition.