Beta-delayed multi-particle emission studies at ISOLDE

We report here on the recent beta -decay studies made at ISOLDE/CERN to determine the multiparticle breakup mechanism of excited states in light nuclei. The beta -2p emission in /sup 31/Ar is resolved. Mirror beta transitions in the A=9 chain are compared and a large asymmetry factor is deduced for the transitions to high excitation energy in /sup 9/Be (11.8 MeV) and /sup 9/B (12.2 MeV) fed in the beta -decay of /sup 9/Li and /sup 9/C respectively. It is shown that the asymmetry is not due to experimental problems or differences in the mechanisms of breakup or in the spin of the states, only differences in the partial decay branches of the breakup channels has been found. (27 refs).