Timescales of Quantum Equilibration, Dissipation and Fluctuation in Nuclear Collisions
Date
2020
Authors
Simenel, Cedric
Godbey, K
Umar, A S
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American Physical Society
Abstract
Understanding the dynamics of equilibration processes in quantum systems as well as their interplay with dissipation and fluctuation is a major challenge in quantum many-body theory. The timescales of such processes are investigated in collisions of atomic nuclei using fully microscopic approaches. Results from time-dependent Hartree-Fock and time-dependent random-phase approximation calculations are compared for 13 systems over a broad range of energies. The timescale for full mass equilibration (∼2x× 10−20s) is found to be much larger than timescales for neutron-to-proton equilibration, kinetic energy, and angular momentum dissipations which are on the order of 10−21s. Fluctuations of mass numbers in the fragments and correlations between their neutron and proton numbers build up within only a few
10−21s. This indicates that dissipation is basically not impacted by mass equilibration, but is mostly driven by the exchange of nucleons between the fragments.
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Physical Review Letters
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Journal article
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Open Access
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Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license
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