Final excitation energy of fission fragments

Abstract

We study how the excitation energy of the fully accelerated fission fragments is built up. It is stressed that only the intrinsic excitation energy available before scission can be exchanged between the fission fragments to achieve thermal equilibrium. This is in contradiction with most models used to calculate prompt neutron emission where it is assumed that the total excitation energy of the final fragments is shared between the fragments by the condition of equal temperatures. We also study the intrinsic excitation-energy partition according to a level density description with a transition from a constant-temperature regime to a Fermi-gas regime. Complete or partial excitation-energy sorting is found at energies well above the transition energy.

8 pages, 3 figures

References in corpus (2)

• Calculation of fission observables through event-by-event simulation
• Thermodynamics of nuclei in thermal contact

Cited by in corpus (8)

• Theory of Nuclear Fission
• Dissipative dynamics in quasi-fission
• Influence of complete energy sorting on the characteristics of the odd-even effect in fission-fragment element distributions
• Structure in the Event-by-Event Energy-Dependent Neutron-Gamma Multiplicity Correlations in ${}^{252}\text{Cf}$(sf)
• The fast neutron induced fission of ${}^{240}$Pu and ${}^{242}$Pu
• Instrumentation for correlated prompt $n$-$\gamma$ emission studies in coincidence with fission fragments
• Microscopic Theory of Nuclear Fission
• Generalization of the Maier-Leibniz Doppler-Shift Method for Gamma-Ray Correlations in Fission