FISSION FRAGMENT MASS, KINETIC ENERGY AND ANGULAR DISTRIBUTION FOR 235-U(N,F) IN THE NEUTRON ENERGY RANGE FROM THERMAL TO 6 MEV
A double Frisch gridded ionization chamber has been used for the measurements. For both fission fragments the mass, kinetic energy and emission angle is found. Data have been measured at different neutron energies, E-n, ranging from thermal to 6.0 MeV in steps of 0.5 MeV. The measured angular anisotropies will be shown. A fit, based on statistical theory, to earlier measurements of negative anisotropies for E-n <= 0.2. MeV will be discussed. The measured total kinetic energy averaged over all fragment masses, TKE (E-n), shows a sudden decrease at E-n about 4.5 MeV in agreement with earlier measurements. This sudden decrease can not be explained by the measured change in the mass distribution. The present data of TKE (E-n) as a function of mass split reveal that TKE (E-n) decreases with E-n for mass splits around 104/132 split as predicted by calculations of B.D. Wilkins et al. It is also seen that TKE (E-n) increases with E-n for the symmetric and the extreme asymmetric fissions. The very structured mass distribution from approximately cold fragmentation will be presented.
Bibliographic Reference: IAEA ADVISORY GROUP MEETING ON NUCLEAR STANDARD REFERENCE DATA, GEEL (BELGIUM), NOV. 12-16, 1984 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 31891 ORA
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Record Number: 1989123064400 / Last updated on: 1987-01-01
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