The yields of 28 mass chains have been measured for fission of 3 U and~S U induced by neutrons at four different energies from 6.0 to 9.1 MeV. This is the first experimental measurement where sufficient energy resolution was obtained to observe the effect of the onset of second chance fission in the case of symmetric fission. The Ag and i pd results are compared with measurements at other neutron energies and with previous theoretical predictions. All nuclide results are presented in tabular form, as a function of neutron energy. The mass chains measured range from 84 to 156. NUCLEAR REACTIONS, FISSION~U(n, f) and 3~U(n, f), E=6. 0, 7.1, 8.1,9.]. MeV; measured yields of 28 mass chains.
We measured the (n, 2n) cross sections for neutron energies from 13.7 to 15.1 MeV on 239 Pu and 241 Am by α-and γ -spectroscopy measurements of the post-irradiation 238 Pu/ 239 Pu and 240 Am/ 241 Am ratios relative to the (n, 2n) cross sections of 196 Au and other calibration reactions. Statistical errors on the measurements were not more than a few percent. Cross-section values ranged from 228 to 214 millibarns for the reaction on 239 Pu and from 260 to 222 millibarns for the 241 Am reaction for neutron energies from 13.7 to 15.1 MeV.
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