Cross section and angular distribution of products in quasifission reactions induced by 525-MeV 84Kr ions on a 209Bi target

We observed "quasifission" events (or "incomplete fusion" events) in the bombardment of ²⁰⁹Bi by 525-MeV ⁸⁴Kr ions. By a simple method, the angular distribution of these events has been obtained. Its maximum value appears around 65° lab, i.e., 95° c.m. The integrated cross section for this reaction is 500 mb, more than 1/2 of the total reaction cross section. No symmetric fission coming from a complete fusion nucleus has been observed, and it seems that the "quasifission" reaction occurs instead of complete fusion, as was previously observed at 500 MeV bombarding energy.