Studies of positrons annihilation processes are of a very high interest for fundamental research, as interesting experiments can be performed "beyond" Standard Model. It also concerns experiments on search for additional dimensions or "Mirrored" Dark Matter [1 - 3]. Spectroscopy of positrons annihilation is also a powerful tool for research of microstructure of materials approaching surfaces and transitional zones, to study the destruction of materials caused by various radiations, such as ultraviolet and ion implantation, to characterise anisotropic structures or modifications of free volumes under mechanical factors, to study of changes in chemical properties during absorption of molecules of gases and liquids by porous polimers, to study the distribution of electron density in metals and semiconductors.

An experimental device for search of additional dimensions or "mirrored" Dark Matter (CERN)

A device that generates a beam of low energy positrons (CERN)

A device for measuring of positronium decay time (LMOPS, France)

1. A new experiment to search for the invisible decay of the orthopositronium. A. Badertscher, P. Crivelli, W. Fetscher (Zurich, ETH), D. Sillou (Annecy, LAPP),. Apr 2004. 12pp. Talk given at Workshop on Positronium Physics, Zurich, Switzerland, 30-31 May 2003. e-Print Archive: hep-ex/0404037
2. A. Badertscher. An apparatus to search for mirror dark matter. 2004, Int.J.Mod.Phys. A19 3833-3848.  DOI: 10.1142/S0217751X04020105
3. S.N. Gninenko, N.V. Krasnikov, and A. Rubbia "Extra dimensions and invisible decay of orthopositronium" Phys. Rev. D 67, 075012 (2003). DOI: 10.1103/PHYSREVD.67.075012