Time-dependent generator-coordinate-method study of mass-asymmetric fission of actinides

Scientific paper - Original scientific paper

• Author: Jie Zhao
• Author: Jian Xiang
• Author: Zhi-Pan Li
• Author: Tamara Nikšić; MBZ: 234533
• Author: Dario Vretenar; MBZ: 9570
• Author: Shan-Gui Zhou
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

Low-energy positive and negative parity collective states in the equilibrium minimum, and the dynamics of induced fission of actinide nuclei are investigated in a unified theoretical framework based on the generator coordinate method (GCM) with the Gaussian overlap approximation (GOA). The collective potential and inertia tensor, both at zero and finite temperature, are computed using the self-consistent multidimensionally constrained relativistic mean field model, based on the energy density functional DD-PC1. Pairing correlations are treated in the Bardeen-Cooper-Schrieffer approximation with a separable pairing force of finite range. A collective quadrupole-octupole Hamiltonian characterized by zero-temperature axially symmetric deformation energy surface and perturbative cranking inertia tensor, is used to model the low-lying excitation spectrum. The fission fragment charge distributions are obtained by propagating the initial collective states in time with the time-dependent GCM+GOA that uses the same quadrupole-octupole Hamiltonian, but with the collective potential and inertia tensor computed at finite temperature. The illustrative charge yields of 228Th, 234U, 240Pu, 244Cm, and 250Cf are in very good agreement with experiment, and the predicted mass asymmetry is consistent with the result of a recent microscopic study that has attributed the distribution (peak) of the heavier-fragment nuclei to shell-stabilized octupole deformations.

• Keywords (english): fission; nuclear density functional theory
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review C
• Numbering: vol. 99, no. 5, 054613
• p-ISSN: 2469-9985
• e-ISSN: 2469-9993
• DOI: https://doi.org/10.1103/physrevc.99.054613
• URN:NBN: urn:nbn:hr:217:147703
• Publication: 2019
• Document URL: https://journals.aps.org/prc/abstract/10.1103/PhysRevC.99.054613
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2019 American Physical Society. Received 24 February 2019. Published 14 May 2019.
• Created on: 2020-08-24 11:47:34