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Angular correlations of prompt g rays in binary and light-charged-particle (LCP)-accompanied spontaneous fission of 252 Cf were measured with a 4p-crystal-ball NaI(Tl) gray spectrometer. For 3 H, 4 He, 6 He, Li, and Be accompanied fission, gray angular distributions were deduced with respect to the motion both of the fragments and the LCPs. There is no indication for a change of the fragment spin alignment by the LCP release or for a correlation between the LCP direction and a bending motion at scission, as was argued in previous investigations. Consequences for the understanding of fragment spin formation are briefly discussed. [S0031-9007(98)08179-4]

An experiment was performed on prompt γ-ray emission in binary and α-particle accompanied spontaneous fission of 252 Cf using the Darmstadt-Heidelberg 4π NaI Crystal Ball spectrometer. The enhancement in γ-ray yield, denoted as the "high-energy component", which appears between 3.5 and 8 MeV and in the region of near-symmetric fragment mass splits, was observed to be equally pronounced in both fission modes. Analyzing the fragment mass dependence of the mean γ-ray multiplicity in both fission modes clearly identifies the disintegration of equilibrated fission fragments in a narrow mass range around the double-magic 132 Sn as the source of these γ-rays.

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