Recent Experiments on Particle-Accompanied Fission

The rare ternary fission (TF) process has been studied in a number of correlation experiments that have included registration of neutrons and γ-rays along with the light charged particles (LCPs) or coincident emission of two LCPs. Highly efficient detector setups have permitted, for the fission reactions ²⁵²Cf(sf) and ^233,235U(n_th,f), to identify the population of excited states in LCPs, the formation of neutron-unstable nuclei as short-lived intermediated LCPs, as well as the sequential decay of particle-unstable LCP species into charged particle pairs. Quaternary fission with an apparently independent emission of two charged particles has also been observed. The applied technologies are briefly summarized, and particular results are presented and discussed.