Toward a European Network of Positron Laboratories
Karwasz Grzegorz P.,
Brusa Roberto S.,
Egger Werner,
Ogorodnikova Olga V.
Affiliations
Karwasz Grzegorz P.
Institute of Physics, Faculty of Physics, Astronomy and Applied Informatics, Nicolaus Copernicus University in Toruń, 5/7 Grudziądzka Str., 87-100 Toruń, Poland
Brusa Roberto S.
Physics Department, University of Trento and TIFPA-INFN, 38123 Povo (TN), via Sommarive 14, Italy
Egger Werner
Universität der Bundeswehr München, Werner-Heisenberg-Weg 39, 85577 Neubiberg, Germany
Ogorodnikova Olga V.
National Research Nuclear University “MEPHI”, Kashirskoe sh. 31, Moscow, Russia
Some applications of controlled-energy positron beams in material studies are discussed. In porous organic polysilicates, measurements of 3γ annihilation by Doppler broadening (DB) method at the Trento University allowed to trace pore closing and filling by water vapor. In silicon coimplanted by He+ and H+, DB data combined with positron lifetime measurements at the München pulsed positron beam allowed to explain Si blistering. Presently measured samples of W for applications in thermonuclear reactors, irradiated by W+ and electrons, show vast changes of positron lifetimes, indicating complex dynamics of defects.
