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Quadrupole Interactions and Anisotropic Magnetic Quenching of Positronium in Oriented Crystals

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Bondarev I. V., Kuten S. A.
Acta Physica Polonica A
|
1995
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vol. 88
|
issue 1
83-90
EN
The quadrupole interaction of positronium in noncubic defectless crystals has been investigated theoretically. It is shown to lead to the weak anisotropy of positronium magnetic quenching. The temperature dependence of the quadrupole coupling constant and the estimations of the magnitude of the anisotropy are obtained for delocalized positronium in crystalline quartz. The significant magnitude of the anisotropy is predicted for "anomalous" positronium in oriented crystalline polymeric structures.
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Positron Annihilation Studies of Styrene-N-X-Phenylmaleimides

100%
Baranowski A., Dębowska M., Jerie K., Rudzińska-Girulska J., Pawełka Z., Sikorski R. T.
Acta Physica Polonica A
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1995
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vol. 88
|
issue 1
51-57
EN
Results of angular correlation of annihilation radiation and positron an­nihilation lifetime measurements are presented for five styrene copolymers: poly(co-styrene-phenylmaleimide) and its three derivatives with chlorine as well as for one with the OH group substituted in the benzene ring. It occurs that the chlorine substituted in three different positions in the benzene ring poly(co-styrene-o (or -m, -p)-chlorophenylmaleimide) inhibits the formation of the positronium to different extent. The greatest effect is observed in case of the chlorine atoms substituted in the benzene ring at ortho-position towards the nitrogen atom. In addition, electric dipole moments were measured for N-X-phenylmaleimide units, to check whether their magnitude influences the positron annihilation parameters. On the basis of the present results no correlation between the positron annihilation parameters and the electric dipole moments of the units was noticed.
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