Cold fragmentation in thermal neutron induced fission of235U

Abstract
The fragmentations without neutron emission (cold fragmentations) have been investigated using a twin- axial gridded ionization chamber, for thermal neutron induced fission of 235U. The kinetic energies of both fragments have been measured with high energy resolution (∼ 300 keV FWHM). Simultaneously, the fragment charges have been determined with a precision of Z/ΔZ = 45. The results show, for a given charge split, no even-odd effect in mass yield. The division for a given mass fragmentation is mainly governed by the splitting which maximises the energy released.