Thursday, November 10, 2005, 16:00
OSGA/E6
Y. Kopatch, JINR Dubna
Abstract:
Ternary fission is a rare fission process, accompanied by the emission
of a Light Charged Particle (LCP), the most probable of which is an
alpha-particle. Although the probability of such a process is much below
1%, compared to the normal binary fission, its study is of special
interest for nuclear physics, as the emission of the LCP occurs at the
moment of scission, thus giving the experimentalists information about
the dynamics of fission at the very beginning of this process.
Quaternary fission is an even rarer process, accompanied by the emission
of two LCPs simultaneously.
A review of recent correlation experiments on ternary and quaternary fission will be presented. Highly efficient detector setups have permitted to register neutron and gamma-ray emission in correlation with ternary particles, to identify the population of excited states in LCPs, the formation of neutron-unstable nuclei as short-lived intermediate LCPs, as well as the sequential decay of particle-unstable LCP species into charged particle pairs ("pseudo" quaternary fission). "True" quaternary fission with an apparently independent emission of two charged particles has also been observed.