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Exchange collisions between positronium and Cu2+ ions
Authors:A Bisi  G Consolati  F Quasso  L Zappa
Institution:(1) Istituto di Fisica del Politecnico, 20133 Milano, Italia
Abstract:Summary The fate and properties of the ortho-Ps in aqueous solutions of CuSO4 and CuCl2 have been investigated through lifetime measurements and through a magnetic-quenching experiment. The obtained results are interpreted in terms of exchange collisions between Ps and unpaired electron. An upper limit is given for the chemical-quenching rate. Our measurements have shown that the presence of paramagnetic centres determines a strong shift of the levels of the Ps hyperfine structure. This work was entirely supported by CISM (Centro Interuniversitario di Struttura della Materia) of the Ministero della Publica Istruzione and by GNSM (Gruppo Nazionale di Struttura della Materia) of CNR.
Keywords:Positron annihilation
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