Production of Cold Positronium Atoms

摘要: . In order to study antimatter physical properties (CPT(charge, parity, time) invariance and principle of equivalence test) it is nec-essary keep this system at the lowest possible (sub-kelvin) temperatures.This requires generation a suitable °ux cold Ps atoms in vacuum,a non-trivial requirement light present experimental results.In paper we discuss state actual knowledge on positroniumformation consequent emission from metallic surfaces insulators andwe show opportunity use porous materials cool positro-nium through collisions with inner walls pores. We get roughindication geometrical parameters pore propose sim-ple experiment obtain kinetic energy | therefore equivalenttemperature emitted positronium without using positron beam.PACS numbers: 78.70.Bj, 36.10.Dr, 36.10.Gv