HIGH-ENERGY GAMMA-RAYS IN ALPHA-ACCOMPANIED SPONTANEOUS FISSION OF C-252-F

An experiment was performed on prompt gamma-ray emission in binary and alpha-particle accompanied spontaneous fission of Cf-252 using the Da rmstadt-Heidelberg 4 pi NaI Crystal Ball spectrometer. The enhancement in gamma-ray yield, denoted as the ''high-energy component'', which a ppears between 3.5 and 8 MeV and in the region of near-symmetric fragm ent mass splits, was observed to be equally pronounced in both fission modes. Analyzing the fragment mass dependence of the mean gamma-ray m ultiplicity in both fission modes clearly identifies the disintegratio n of equilibrated fission fragments' in a narrow mass range around the double-magic Sn-132 as the source of these gamma-rays.