Track Effects in Positronium Formation

S.V. Stepanova,b,c, V.M. Byakova,c,d, G. Duplâtre e, P.S. Stepanov f and A.V. Bokova,c aNRC "Kurchatov Institute" - Institute of Theoretical and Experimental Physics, B. Cheremuskinskaya str., 25, 117218 Moscow, Russia bNational Research Nuclear University "MEPhI", 115409, Moscow, Russia cLomonosov Moscow State University, Chemical Department, Leninskie Gory, Moscow, Russia dD. Mendeleyev University of Chemical Technology of Russia, Miusskaya sq., 9, 125047, Moscow, Russia eInstitut Pluridisciplinaire Hubert Curien, CNRS/IN2P3, BP 28 67037 Strasbourg, France fDepartment of Physics and Astronomy, 104 Overmann Hall, Bowling Green State University, OH, 43403, USA

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We discuss some aspects important for interpretation of the Ps formation process in liquids and molecular media: (1) inhomogeneity of intratrack reactions and parameters of the e+ track, (2) final states of e+, its solvation in polar and nonpolar liquids, relation to e+ mobility, (3) quasi-neutrality of the e+ blob and its ambipolar outdiffusion, (4) appearance of the "in-blob" and "out-of-the-blob" positron fractions, and (5) electric field effect on Ps formation.

DOI: 10.12693/APhysPolA.132.1461 topics: positron, positronium, annihilation, ion-electron recombination, solvation, mobility, external electric field, track effects, polar and nonpolar liquids