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Fission dynamics within time-dependent Hartree-Fock. II. Boost-induced fission

Goddard, P, Stevenson, P and Rios, A (2016) Fission dynamics within time-dependent Hartree-Fock. II. Boost-induced fission PHYSICAL REVIEW C, 93 (1), ARTN 01462.

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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 induced fission processes, using quadrupole boosts in the nuclide 240Pu as an example. Methods: Following upon the work presented in Goddard et al. [Phys. Rev. C 92, 054610 (2015)], quadrupoleconstrained Hartree-Fock calculations are used to create a potential energy surface. An isomeric state and a state beyond the second barrier peak are excited by means of instantaneous as well as temporally extended gauge boosts with quadrupole shapes. The subsequent deexcitation is studied in a time-dependent Hartree-Fock simulation, with emphasis on fissioned final states. The corresponding fission fragment mass numbers are studied. Results: In general, the energy deposited by the quadrupole boost is quickly absorbed by the nucleus. In instantaneous boosts, this leads to fast shape rearrangements and violent dynamics that can ultimately lead to fission. This is a qualitatively different process than the deformation-induced fission. Boosts induced within a finite time window excite the system in a relatively gentler way and do induce fission but with a smaller energy deposition. Conclusions: The fission products obtained using boost-induced fission in time-dependent Hartree-Fock are more asymmetric than the fragments obtained in deformation-induced fission or the corresponding adiabatic approaches.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Goddard, P
Stevenson, P
Rios, A
Date : 29 January 2016
Identification Number : 10.1103/PhysRevC.93.014620
Copyright Disclaimer : Copyright 2016 American Physical Society
Uncontrolled Keywords : Science & Technology, Physical Sciences, Physics, Nuclear, Physics, NUCLEAR-FISSION, MEAN-FIELD, ODD COMPONENTS, PU-240, ENERGY, CODE
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 14 Jul 2016 07:58
Last Modified : 31 Oct 2017 18:07

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