LABORATORI NAZIONALI DI LEGNARO
In the recent years, there has been considerable interest to explore the possibility of synthesizing the super-heavy nuclei (Z~110-126) by heavy ion fusion reactions and to find out if some of these nuclei can indeed turn out to have a relatively long half life due to the stabilizing effect of the closed nuclear shells, as predicted by theoretical models. It is also of considerable interest to study the fission decay branch as it enables to explore the fission characteristics of a super-heavy nucleus. In this work, we have investigated the kinematics of the two-body exit channels through two- parameter fragment mass-total kinetic energy (AFF -TKE) correlations and coincident neutron measurements. We have also measured the neutron spectra at different angles in coincidence with fission fragments to deduce pre-scission and post to gain deeper insight into the reactions dynamics. Using these npre values as clocks, we have determined the lifetime of the di-nuclear complex for the symmetric mass divisions window (M=130-144) for the above two cases using the procedure described earlier. The detailed results will be discussed.

DATA: 30-09-2004