Double-Hit Experimental Approach in Study of the Ternary Decays of 252Cf(sf)

The results of investigation of the break-up of some fraction of the fission fragments from the binary fission of 252Cf(sf), while they pass through the Ti foil are presented. Two experimental approaches add each other in the study namely missing mass and “double-hit” methods. In the frame of the latter one both products of the break-up are detected in the same PIN diode. The break-up occurs after a binary fission and is delayed by approximately 150 ps. This is a strong indication that the fragment undergoing the break-up is born in the shape isomer state.