Timescales of Quantum Equilibration, Dissipation and Fluctuation in Nuclear Collisions

Date

2020

Authors

Simenel, Cedric
Godbey, K
Umar, A S

Journal Title

Journal ISSN

Volume Title

Publisher

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.

Description

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Citation

Source

Physical Review Letters

Type

Journal article

Book Title

Entity type

Access Statement

Open Access

License Rights

Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license

DOI

10.1103/PhysRevLett.124.212504

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