Microscopic study of induced fission dynamics of ${}^{226}$Th with covariant energy density functionals

Abstract

Static and dynamic aspects of the fission process of ${}^{226}$Th are analyzed in a self-consistent framework based on relativistic energy density functionals. Constrained relativistic mean-field (RMF) calculations in the collective space of axially symmetric quadrupole and octupole deformations, based on the energy density functional PC-PK1 and a $\delta$-force pairing, are performed to determine the potential energy surface of the fissioning nucleus, the scission line, the single-nucleon wave functions, energies and occupation probabilities, as functions of deformation parameters. Induced fission dynamics is described using the time-dependent generator coordinate method in the Gaussian overlap approximation. A collective Schrödinger equation, determined entirely by the microscopic single-nucleon degrees of freedom, propagates adiabatically in time the initial wave packet built by boosting the ground-state solution of the collective Hamiltonian for ${}^{226}$Th. The position of the scission line and the microscopic input for the collective Hamiltonian are analyzed as functions of the strength of the pairing interaction. The effect of static pairing correlations on the pre-neutron emission charge yields and total kinetic energy of fission fragments is examined in comparison with available data, and the distribution of fission fragments is analyzed for different values of the initial excitation energy.

25 pages, 14 figures, accepted for publication in Phys. Rev. C

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• Time-dependent generator coordinate method study of fission: dissipation effects
• Microscopic core-quasiparticle coupling model for spectroscopy of odd-mass nuclei with octupole correlations
• Role of dynamic pairing correlations in fission dynamics
• Microscopic description of pair transfer between two superfluid systems (II): a quantum mixing of Time-Dependent Hartree-Fock Bogolyubov trajectories
• Time-dependent generator coordinate method study of fission: mass parameters
• Extended time-dependent generator coordinate method study of induced fission (II): total kinetic energy distribution
• Generator coordinate method for transition-state dynamics in nuclear fission
• Three-dimensional potential energy surface for fission of ${}^{236}$U within covariant density functional theory
• Phase-space consideration on barrier transmission in a time-dependent variational approach with superposed wave packets
• Microscopic self-consistent description of induced fission: dynamical pairing degree of freedom