Nuclear dynamics induced by antiprotons

TL;DR

This paper investigates antiproton-induced nuclear reactions using a quantum molecular dynamics model, focusing on particle production, annihilation effects, and hyperon formation across various target nuclei and incident momenta.

Contribution

It introduces a comprehensive model including multiple reaction channels to study antiproton-nucleus collision dynamics and particle production mechanisms.

Findings

Annihilation significantly influences particle production dynamics.

Hyperons are mainly produced via meson-induced reactions and strangeness exchange.

Delayed hyperon emission results from specific reaction pathways.

Abstract

Reaction dynamics in collisions of antiprotons on nuclei is investigated within the Lanzhou quantum molecular dynamics model. The reaction channels of elastic scattering, annihilation, charge exchange and inelastic collisions of antiprotons on nucleons have been included in the model. Dynamics on particle production, in particular pions, kaons, antikaons and hyperons, is investigated in collisions of $\overline{p}$ on $^{12}$C, $^{20}$Ne, $^{40}$Ca and $^{181}$Ta from a low to high incident momenta. It is found that the annihilations of $\overline{p}$ on nucleons are of importance on the dynamics of particle production in phase space. Hyperons are mainly produced via meson induced reactions on nucleons and strangeness exchange collisions, which lead to the delayed emission in antiproton-nucleus collisions.