The Evidence of Quasi-Free Positronium State in GiPS-AMOC Spectra of Glycerol

D. Zvezhinskiya, b, M. Butterlingc, A. Wagnerc, R. Krause-Rehbergd and S.V. Stepanova,b aInstitute for Theoretical and Experimental Physics, B. Cheremushkinskaya 25, 117218, Moscow, Russia bMoscow Engineering and Physics Institute, Dept. of Extreme States of Condensed Media, 115409, Moscow, Russia cInstitute of Radiation Physics, Helmholtz-Zentrum, Dresden-Rossendorf, P.O. Box 510119, 01314, Dresden, Germany dMartin-Luther-University Halle-Wittenberg, Dept. of Physics, 06099, Halle, Germany

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We present the results of processing of age-momentum correlation spectra that were measured for glycerol by the gamma-induced positron spectroscopy facility. Our research has shown that the shape of experimental s(t) curve cannot be explained without introduction of the intermediate state of positronium (Ps), called quasi-free Ps. This state yields the wide Doppler line near zero lifetimes. We discuss the possible properties of this intermediate Ps state from the viewpoint of developed model. The amount of annihilation events produced by quasi-free Ps is estimated to be less than 5% of total annihilations. In the proposed model, quasi-free Ps serves as a precursor for trapped Ps of para- and ortho- states.

DOI: 10.12693/APhysPolA.125.821 PACS numbers: 78.70.Bj, 82.30.Gg, 34.80.-i, 34.80.Lx