Seminarium Anihilacji Pozytonów
The Seminar on Positron Annihilation (SPA) (former The Polish Seminar on Positron Annihilation) has been organized since 1966, Professor Jan Wesołowski initiated it. Professor Bronisław Rozenfeld was the next Scientific Director and since 1990 Professor Marian Szuszkiewicz has been the one. Since 1995 the Institute of Experimental Physics has been co-operating with the scientists from the Opole University (Institute of Physics) in organization of SPA From the very beginning scientists, both from Poland and the whole world, took part in it. From the mid-1980s, the every second year the SPA is organized with participation of foreigners. The subject of the conference includes both theoretical and experimental questions, concerning with positron annihilation phenomenon and its use to study matter. Physicists, chemists, geologists and technologists present the latest achievements of studies of matter obtained by use of methods of the positron annihilation spectroscopy. The scientific program of the Seminar includes: fundamental aspects of positron and positronium physics and chemistry, studies of electronic structure, phase transitions and defects in metals, alloys, semiconductors, superconductors and polymers, surface studies, slow positron beam technique, the development of experimental and data processing techniques, applications. The SPA is one of well recognized conferences devoted to positron annihilation. Its high scientific level is appreciated very much by people from the whole world involved in positron annihilation studies. The number of foreigners attending it is going up continuously. In 1996 more than one half of participants came from abroad. Outstanding persons took part in the conference, in the past: Prof. S. Berko (USA), Prof. K. Fujiwara (Japan), Prof. A. Dupasquier (Italy), Prof. R. West (USA), Prof. W. Triftshäuser (Germany), Prof. A. Hrynkiewicz (Poland), Prof. V.I. Goldanski (Russia), Prof. P.E. Mijnarends (Holland) and many others. Proceedings of the conference are published as special volumes of Acta Physica Polonica A (in 1997, as a special issue of Nukleonika).