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Abstract

Fission fragment energies and the emission angles with respect to the incident neutron beam were measured for 235-U(n,f) using a twin ionization chamber. A neutron energy range from thermal to 6 MeV in steps of 0.5 Mev was covered. The preneutron emission mass distributions were evaluated and described by a five- Gaussian representation. The parametrization made visible a sudden change in the incident neutron energy dependence for all but the symmetric fission parameters between 1.5 and 2.0 MeV, which might be due to pair breaking. From the total kinetic energy as function of mass split the sum of deformations of the two fragments was evaluated in the frame of Wilkins static scission point model. Here clear proton pairing effects became visible which seem to make the even-proton fragments less deformed than neighbouring old proton fragments. The present data show also that the observed drop in TKE averaged over all the fragments above 4 MeV is due to changes in TKE for different mass splits with excitation energy. Angular distributions for the different fragment masses showed no mass dependence.

Additional information

Authors: STRAEDE CH, JRC GEEL ESTAB. (BELGIUM);BUDTZ JOERGENSEN C, JRC GEEL ESTAB. (BELGIUM);KNITTER H H JRC GEEL ESTAB. (BELGIUM), JRC GEEL ESTAB. (BELGIUM)
Bibliographic Reference: 4TH INTERNATIONAL SYMPOSIUM ON NEUTRON INDUCED REACTIONS, SMOLENICE (CZECHOSLOVAKIA), JUNE 17-21, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32239 ORA
Availability: Can be ordered online
Record Number: 1989124011700 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en