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Specific Fission<i><i>J</i></i>-Window and Angular Momentum Dependence of the Fission Barrier
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1997
Year
EngineeringNuclear PhysicsNuclear DataFission BarrierReactor PhysicsHeavy Ion PhysicNuclear FissionNuclear MaterialsLow-energy Nuclear StructureRfrm Fission BarriersNuclear DecayHigh-energy Nuclear ReactionPhysicsNuclear TheoryAtomic PhysicsFission EnergyNuclear ReactionsNuclear EngineeringNuclear AstrophysicsNuclear EnergyFission BarriersNatural SciencesApplied PhysicsNuclear ExperimentsNeutron Scattering
A method to determine a unique J -window in the fission process was devised and the fissioning nuclide associated with thus extracted J -window was identified for each of the heavy-ion reaction systems. Obtained fission barriers at the resulting J -window were compared with the calculated values by the rotating finite range model (RFRM). The deduced barriers for individual nuclides were compared with the RFRM barriers to reproduce more or less the angular momentum dependence the RFRM prediction. The deduced systematic behavior of the fission barrier indicates no even-odd and shell corrections are necessary. The nuclear dissipation effect based on Kramer's model revealed substantial reduction of the statistically deduced barrier heights and brought a fairly large scattering from the RFRM J -dependence. However, introduction of the temperature-dependent friction coefficient (γ = 2 for T ≥ 1.0 MeV and 0.5 for T < 1.0 MeV) was found to bring about satisfactory agreement with both RFRM fission barriers and the pre-fission neutron multiplicity systematics.