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Fission dynamics within time-dependent Hartree-Fock: Deformation-induced fission

Rios Huguet, A, Stevenson, PD and Goddard, P (2015) Fission dynamics within time-dependent Hartree-Fock: Deformation-induced fission Physical Review C: Nuclear Physics, 92, 054610.

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Background: Nuclear fission is a complex large-amplitude collective decay mode in heavy nuclei. Microscopic density functional studies of fission have previously concentrated on adiabatic approaches based on constrained static calculations ignoring dynamical excitations of the fissioning nucleus and the daughter products. Purpose: We explore the ability of dynamic mean-field methods to describe fast fission processes beyond the fission barrier, using the nuclide 240Pu as an example. Methods: Time-dependent Hartree-Fock calculations based on the Skyrme interaction are used to calculate nonadiabatic fission paths, beginning from static constrained Hartree-Fock calculations. The properties of the dynamic states are interpreted in terms of the nature of their collective motion. Fission product properties are compared to data. Results: Parent nuclei constrained to begin dynamic evolution with a deformation less than the fission barrier exhibit giant-resonance-type behavior. Those beginning just beyond the barrier explore large-amplitude motion but do not fission, whereas those beginning beyond the two-fragment pathway crossing fission to final states which differ according to the exact initial deformation. Conclusions: Time-dependent Hartree-Fock is able to give a good qualitative and quantitative description of fast fission, provided one begins from a sufficiently deformed state.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Date : 11 November 2015
Identification Number : 10.1103/PhysRevC.92.054610
Additional Information : ©2015 American Physical Society
Depositing User : Symplectic Elements
Date Deposited : 23 Dec 2015 15:13
Last Modified : 23 Dec 2015 15:13

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