Positron Annihilation Spectroscopy at LEPTA Facility

摘要

The Low Energy Positron Toroidal Accumulator (LEPTA) at JINR proposed for generation of positronium in flight can be used for positron annihilation spectroscopy (PAS) . The positron injector of the LEPTA facility can generate continuous a slow positron beam with the intensity up to 1·10~7s~(-1) at the energy in the range of a few eV to 100 keV and width of the spectrum 1 - 2 eV. The injector is based on radioactive ~(22)Na isotope. The solid neon is used as a moderator to generate monochromatic beam. The parameters of the positron beam allow scanning the condensed matter in depth up to 10 microns with resolutions less than 10 nanometers and investigating layered structures for microelectronics and properties of a surface.