A model for the mass-number independence of the antiproton annihilation on nuclei at low energies

摘要

A simple model explaining the recently observed approximate independence of the annihilation cross section on light nuclei at low energies is proposed. The salient idea is based on the realization that the pis from the annihilation on a nucleon have energies in the region of the Delta (1232) resonance. The coherent propagation of these pis through the excitation of several Delta resonances results in a destructive interference explaining why the annihilation of antiprotons in nuclei is suppressed. This model suggests a very effective way to produce "Delta matter" with several A resonances in interaction. (C) 2001 Elsevier Science B.V. All rights reserved. References: 18