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The neutron-energy angular distributions relative to the fragment direction of (252)Cf (SF) were analyzed. The results of three independent experiments being in reasonable agreement allow us to conclude that a 30+/-5 % neutron surplus exists at ~90degrees, which cannot be accounted for with the assumption that all neutrons are emitted from fully accelerated fragments. An explanation of this experimental finding could be an additional source of neutrons e.g. so-called scission neutrons (SCN). Angular and energy distributions of these additional neutrons were evaluated from IRMM experimental data and were compared with the result of two other experiments. According to previous theoretical calculations the observed additional amount of SCN of ~0.4 neutrons/fission can be accounted for if the transition time from saddle to scissions ~1.5 10(-21)s.

Additional information

Authors: KORNILOV N V, Institute of Physics and Power Engineering (RU);KAGALENKO A B, IDEM (RU);HAMBSCH F J, JRC-Geel, IRMM (BE)
Bibliographic Reference: Article: Letters to Journal of Experimental and Theoretical Physics (1999)
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