The emission of Ne and Mg nuclei was detected in the spontaneous decay of 234U with probabilities of, respectively, (3.9+1.0)• 10 -13 and (2.3_+0.7)• 10 -13 relative to a-decay. The upper limits of this kind of decay for 235U and 236U have been established. Systematics of half-lives for cluster emission are found to be similar to the Geiger-Nuttall dependence for a-decay. Some evidence for the presence of hindrance to cluster emission from the odd-mass nuclei 233U and 235U is obtained.
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