Gebremariam, Hailu2018-06-272023-11-092018-06-272023-11-091996-06http://10.90.10.223:4000/handle/123456789/3827A Recoil Filter Detector I RFO) which was del'eloped in the Hahn-:\Ieilner-Institut (H:\II), Berlin has been im'estigated to determine the detector efficiencI', This detector uses the forward emitted electrons from a thin mylar foil and it has been found to hal-e lo\\'er efficiency than expected from theoretical considerations, For the test measurements a ,.olCf source was used, The fission products from the 2.o2Cf were detected in coincidence ,,-ith the prompt -forays and then the spectra \I'ere analyzed, In I he first part of this paper the reason for the 101\' efficienc\' of tllf' detector and the solution for an impron,ment is presented, In the second part. as an alternative, a Hew ,\esigll of a det.ector is proposed. It- llses the back\rard ~mittr'd electrons and may he preferred, in some aspects, to the RFDenDetector for Heavy Ions and FeasibilityThesis