Formation of Quasi-Free and Bubble Positronium States in Water and Aqueous Solutions
S.V. Stepanova, b, G. Dupl√Ętrec, V.M. Byakova, d, D.S. Zvezhinskiya and V.S. Subrahmanyamc
aInstitute for Theoretical and Experimental Physics, B. Cheremushkinskaya 25, 117218, Moscow, Russia
bNational Research Nuclear University "MEPhI", Kashirskoye shosse 31, Moscow, 115409, Russia
cInstitut Pluridisciplinaire Hubert Curien, CNRS/IN2P3, BP 28 67037 Strasbourg, Cedex 2, France
dD. Mendeleyev University of Chemical Technology of Russia, Miusskaya sq., 9, 125047, Moscow, Russia
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It is shown that in aqueous solutions a positronium atom is first formed in the quasi-free state, and, after 50-100 ps, becomes localized in a nanobubble. Analysis of the annihilation spectra of NaNO3 aqueous solutions shows that the hydrated electron is not involved in the positronium (Ps) formation.

DOI: 10.12693/APhysPolA.125.770
PACS numbers: 71.60.+z, 34.80.Lx, 82.30.Gg