BETA-DELAYED PROTON EMISSION FROM THE PROTON-RICH ISOTOPES SE-67,KR-71, AND SR-75

In an experiment at the SISSI/LISE facility of GANIL, we produced prot on-rich isotopes in the selenium-to-strontium region by projectile fra gmentation of a Kr-78 primary beam at 73 MeV/nucleon. The emission of beta-delayed protons from Se-67, Kr-71, and Sr-75,as observed for the first Lime and the corresponding branching ratios were determined. The proton energy spectra were compared to predictions of a statistical m odel. The half-lives of Se-67, Kr-71, and Sr-75 were deduced from the time characteristics of the observed proton activity. The half-life of Sr-75 was measured for the first time. For Se-67 and Kr-71, the obtai ned half-lives are compared to previous measurements.