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Exchange collisions between positronium and Cu2+ ions

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Il Nuovo Cimento D

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.

Riassunto

Il comportamento e le proprietà dell'orto-positonio in soluzioni acquose di CuSO4 e CuCl2 sono stati studiati mediante l'analisi dello spettro temporale delle annichilazioni e mediante un esperimento di «quenching» magnetico. I risultati ottenuti hanno indicato l'esistenza di collisioni di scambio tra il positonio e gli elettroni spaiati del mezzo. Si è posto anche un limite superiore per un eventuale «rate» di «quenching» chimico. In relazione alle proprietà del positonio, i risultati hanno messo in evidenza che la presenza di centri paramagnetici in acqua determina una forte diminuzione della separazione dei livelli di struttura iperfine del positonio stesso.

Резюме

Используя результаты измеререний времен жизни и эксперименты по магнитной закалке, исследуются свойства орто-позитрония в водных растворах CuSO4 и CuCl2. Полученные результаты интерпретирются в терминах обменных соударений между позитронием и неспаренным электроном. Приводится верхний предел для интенсивности химической закалки. Наши измерения показывают, что присутствие парамагнитных центров обуславливает сильный сдвиг уровней сверхтонкой структуры позитрония.

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Authors and Affiliations

  1. Istituto di Fisica del Politecnico, 20133, Milano, Italia

    A. Bisi, G. Consolati, F. Quasso & L. Zappa

Authors
  1. A. Bisi
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  2. G. Consolati
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  3. F. Quasso
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  4. L. Zappa
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Additional information

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.

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Bisi, A., Consolati, G., Quasso, F. et al. Exchange collisions between positronium and Cu2+ ions. Il Nuovo Cimento D 9, 657–668 (1987). https://doi.org/10.1007/BF02457027

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  • DOI: https://doi.org/10.1007/BF02457027

PACS. 78.70.Bj

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