Excitation energy dependence of neutron yields and fragment kinetic energy release in the proton induced fission of 233U and 238U

摘要: Abstract The yields and energies of neutrons emitted from fission fragments known mass were measured as a function proton bombarding energy for 233 U 238 U. familiar sawtooth dependence v , the number per fragment, on fragment was found to be considerably washed out with increasing energy, depth minimum at A ≈ 132 decreasing more rapidly than that 80. As is increased yield heavy increases does light fragment. results are interpreted in terms qualitative considerations energy-apportionment between time scission. Structure variation total kinetic ratio observed decrease higher energies. nuclear level density parameter final has been obtained neutron data. -values increase near closed shells mid-shell excitation increased.