New results from 252Cf spontaneous fission
The gridded twin ionisation chamber was used to measure the kinetic energy, mass and angular distributions of the fission fragments of 252Cf(SF). Together with a neutron time of flight detector, the measurement revealed isotropic neutron angular distributions in the CM-system, with the conclusion that fission neutrons are emitted from the fully accelerated fragments and that the scission neutron component is of the order of 1%. The energy of the scission neutrons is low, as they are emitted from a slowly moving source. Furthermore, the range of v(A) was extended and showed two new sawteeth near A = 80 and A = 176. v was also measured as a function of A and TKE. The quantity delta/deltaTKE(A) can be interpreted as the elasticity module of that piece of the prsecission shape from which the fragment is to be made. It shows that the precission nucleus cannot be described by homogeneous nuclear matter. Without neutron coincidences, interest was directed mainly towards those events close to the reaction Q-values, where charge distributions were also measured. More than 200 nuclides were identified, of which 56 lie outside the known part of the chart of nuclides. Proton, neutron and mass odd-even effects were also evaluated.
Bibliographic Reference: Paper presented: Deutsche Physikalische Gesellschaft Spring Meeting, Strassburg (DE), March 26-30, 1990
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Record Number: 199010822 / Last updated on: 1994-12-01
Original language: en
Available languages: en