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The spontaneous fission of 252Cf was investigated experimentally in the cold fission region. The fission fragment mass and nuclear charge distributions were determined in total kinetic energy (TKE) bins of 2 MeV width in the TKE-range from 1 to 15 MeV and parallel to the average Q(max)-value as a function of mass. There is no odd-even effect in the mass yield, whereas proton and neutron odd-even effects show linear dependence on (Q(max)-TKE), however with different slopes. The present results lead to the conclusion that these cannot be interpreted as indicators of the intrinsic excitation energy at scission, and that the structure of five to six mass units observed in many fission parameters finds its explanation in the shape of the Q-value surface in fission as a function of mass and nuclear charge in even-even fissioning systems.

Additional information

Authors: HAMBSCH F-J, JRC Geel (BE);KNITTER H-H, JRC Geel (BE);BUDTZ-JÝRGENSEN C, Danish Space Research Institute, Lyngby (DK)
Bibliographic Reference: Paper presented: International Conference on Nuclear Data for Science and Technology, Jülich (DE), May 13-17, 1991
Availability: Available from (1) as Paper EN 35930 ORA
Record Number: 199111252 / Last updated on: 1994-12-02
Original language: en
Available languages: en