Dynamics of Superheavy System in ~(86)Kr + ~(208)Pb Reaction

摘要

The dynamics of the excited superheavy system with Z = 118 in the reaction ~(86)Kr + Pb at E_(Kr) = 600 MeV has been investigated. The mass and kinetic energy of binary fragments were measured by the time-of-flight method. Double differential distributions of neutrons and α particles were measured in coincidence with fragments. Neutron and α-particle probes were used for determination of the fragmentation time scale. Evidence of the neck fragmentation was obtained from analysis of double differential α spectra. properties of the α-particle neck fragmentation component are close to those known form the ternary fission of actinide nuclei, but the multiplicity is much larger. The total kinetic energy distribution of fragments tagged by neutrons or α particles shifts towards lower energies. Fragment yields in the symmetric region increase substantially when fragments are tagged by α particles.