Possibility of cold nuclear compression in antiproton-nucleus collisions

Abstract

We study the dynamical response of the oxygen-16 nucleus to an incident antiproton using the Giessen Boltzmann-Uehling-Uhlenbeck microscopic transport model with relativistic mean fields. A special emphasis is put on the possibility of a dynamical compression of the nucleus induced by the moving antiproton. Realistic antibaryon coupling constants to the mean meson fields are chosen in accordance with empirical data. Our calculations show that an antiproton embedded in the nuclear interior with momentum less than the nucleon Fermi momentum may create a locally compressed zone in the nucleus with a maximum density of about twice the nuclear saturation density. To evaluate the probability of the nuclear compression in high-energy antiproton-nucleus collisions, we adopt a two-stage scheme. This scheme takes into account the antiproton deceleration due to the cascade of antiproton-nucleon rescatterings inside the nucleus (first stage) as well as the nuclear compression by the slow antiproton before its annihilation (second stage). With our standard model parameters, the fraction of antiproton annihilation events in the compressed zone is about $10^{-5}$ for ${\bar{p}}^{16}$O collisions at $p_{\mathrm{lab}}=3-10$ GeV/c. Finally, possible experimental triggers aimed at selecting such events are discussed.

40 pages, 15 figures, new Sect. V on the in-medium modifications of annihilation, modified conclusions, added references, version accepted in Phys. Rev. C

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• Fragment formation in proton induced reactions within a BUU transport model
• Dynamical simulation of bound antiproton-nuclear systems and observable signals of cold nuclear compression
• Antiproton-nucleus collisions simulation within a kinetic approach with relativistic mean fields
• Single-pole nature of Lambda (1405) and structure of K-pp
• Exploring the potential of antihyperons in nuclei with antiprotons
• Cold compression of nuclei induced by antiprotons

Cited by in corpus (12)

• Transport-theoretical Description of Nuclear Reactions
• PANDA Phase One
• Kaon and hyperon production in antiproton-induced reactions on nuclei
• Toward relativistic mean-field description of $\bar{\text{N}}$-nucleus reactions
• Interaction of antiprotons with nuclei
• Evolution of antibaryon abundances in the early Universe and in heavy-ion collisions
• Nonequilibrium effects in hadronic fireball expansion
• Interrelation between $\bar{p}$-Ca Atom Spectra and Nuclear Density Profiles
• Recent progress on superstrange dynamics
• Antiproton-nucleus quasi-bound states within the 2009 version of the Paris $\bar{N}N$ potential
• Interaction of antiprotons with nuclei
• Interaction of antiproton with nuclei