Fermi-liquid approach for description of initial stage of fragmentation at heavy nuclei collisions

TL;DR

This paper proposes a Fermi-liquid based mechanism for the initial fragmentation stage in heavy nuclei collisions, modeling the process as unstable oscillations in nuclear matter that could lead to observable nuclear jets.

Contribution

It introduces a novel Fermi-liquid approach to describe early fragmentation in heavy nuclei collisions, linking instabilities to propagating oscillations similar to plasma beam instability.

Findings

Identifies instability mechanisms related to oscillations in nuclear matter.

Provides behavior characteristics of oscillation growth rates.

Suggests experimental signatures for nuclear jets.

Abstract

A mechanism is proposed for initial stage of instability development that can induce the fragmentation of nuclear matter, arising as a result of collisions of non-relativistic heavy nuclei. Collision of heavy nuclei is simulated as a collision of two unbounded Fermi-liquid ``drops''. The instability origination in such a system is related to propagation of increasing oscillations in the nuclear matter. These oscillations can exist in a resting Fermi-liquid: modified Landau zero sound, modified spin and isospin waves, combination of these more simple waves. These instabilities are analogous to the beam instability in ordinary electron plasma. Behavior features of the obtained oscillation increase increments are provided. They can be used as indication for experimental confirmation of the proposed mechanism of fragmentation at nuclear collisions. Directions along which nuclear matter ``jets'' can be expected are specified.