Antiproton production in heavy-ion collisions at subthreshold energies

Abstract

Within the framework of the Lanzhou quantum molecular dynamics model, the deep subthreshold antiproton production in heavy-ion collisions has been investigated thoroughly. The elastic scattering, annihilation and charge exchange reactions associated with antiproton channels are implemented in the model. The attractive antiproton potential extracted from the G-parity transformation of the nucleon selfenergies enhance the antiproton yields to some extent. The calculated invariant spectra are consistent with the available experimental data. The primordial antiproton yields increase with the mass number of colliding system. However, the annihilation reactions reduce the antiproton production and enable independent to colliding partners. Antiflow phenomena of antiprotons correlated to the mean-field potential and annihilation mechanism is found in comparison with proton flows.

7 pages, 6 figures

References in corpus (5)

• In-medium nuclear interactions of low-energy hadrons
• Nuclear dynamics and particle production near threshold energies in heavy-ion collisions
• Antiproton-nucleus collisions simulation within a kinetic approach with relativistic mean fields
• Nuclear fragmentation and charge-exchange reactions induced by pions in the $\Delta$-resonance region
• Particle production in antiproton induced nuclear reactions