NEW ISOTOPES, SECONDARY REACTIONS AND SPECTROSCOPY FOR MEDIUM-MASS NUCLEI AT THE PROTON DRIP-LINE

This paper reviews two experiments performed at GSI and GANIL. Using a primary beam of Ni-58 at 650 MeV/nucleon impinging on a beryllium tar get, production cross sections of proton-rich fragments from projectil e fragmentation have been measured at the projectile-fragment separato r FRS at GSI. The production rates measured demonstrate that counting rates much higher than expected can be obtained at the proton drip lin e. The results from spectroscopy measurements show that no Thomas-Ehrm ann effect is present in our data which means that the decay energies and masses can be well predicted by using e.g. the IMME. The secondary reactions evidence a slight increase of the interaction cross section s when approaching the proton drip line. Finally, in an experiment per formed at the SISSI/LISE facility at GANIL using a Kr-78 primary beam, we have observed the 5 new isotopes Ga-60, As-64, Kr-69,Kr-70, and Sr -74. However, we have not found any evidence for Br-69 which was repor ted to be observed with a few counts at MSU. These new findings change our understanding of the path and of the ending point of the rp proce ss.