FORMATION OF RELATIVISTIC POSITRON SYSTEMS BY THE AXIAL CHANNELING OFPOSITRONS IN IONIC-CRYSTALS

An analytical expression is written for the effective interaction pote ntial of a fast charged particle with ionic crystals of the CsCl type as a function of the temperature of the medium, taking long-range orde r into account. A numerical analysis shows that there is a real possib ility of axial superchanneling of positrons along the [100] axis of ne gatively charged ions in crystals with this structure. The wave functi on and energy spectrum of the localized state are investigated, and th e possibility of the formation of metastable, two-dimensional, relativ istic positron systems is analyzed. (C) 1998 American Institute of Phy sics. [S1063-7842(98)02104-7].