Microscopic phase-space exploration modeling of $^{258}$Fm spontaneous fission

Abstract : We show that the total kinetic energy (TKE) of nuclei after the spontaneous fission of $^{258}$Fm can be well reproduced using simple assumptions on the quantum collective phase-space explored by the nucleus after passing the fission barrier. Assuming energy conservation and phase-space exploration according to the stochastic mean-field approach, a set of initial densities is generated. Each density is then evolved in time using the nuclear time-dependent density-functional theory. This approach goes beyond mean-field by allowing spontaneous symmetry breaking as well as a wider dynamical phase-space exploration leading to larger fluctuations in collective space. The total kinetic energy and mass distributions are calculated. New information on the fission process: fluctuations in scission time, strong correlation between TKE and collective deformation of daughter nuclei as well as pre- and post-scission particle emission, are obtained.
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Submitted on : Wednesday, September 7, 2016 - 2:20:18 PM
Last modification on : Tuesday, November 20, 2018 - 10:00:15 AM

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Y. Tanimura, D. Lacroix, S. Ayik. Microscopic phase-space exploration modeling of $^{258}$Fm spontaneous fission. Physical Review Letters, American Physical Society, 2017, 118, pp.152501. ⟨10.1103/PhysRevLett.118.152501⟩. ⟨in2p3-01361537⟩

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