FAST TIMING STUDIES OF THE NEUTRON-RICH SINGLY-MAGIC N=82 NUCLEI

The singly-magic nuclei provide a testing ground for the microscopical models on the residual interactions among alike valence nucleons with in relatively simple quantum systems. As part of our systematic studie s of the neutron-rich N = 82 nuclei, we have performed measurements of the level lifetimes in the picosecond regime on Xe-136 and Ba-138 usi ng the fast timing beta gamma gamma(t) method. A summary of the result s is given on the Xe-136, Ba-138 and Ce-140 nuclei.