Electric-field effect on positronium formation and decay in some polymers and fused quartz |
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Authors: | M Rama Rao A P Patro P Sen |
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Institution: | (1) Saha Institute of Nuclear Physics, 700009 Calcutta, India;(2) Institute of Physics, 751007 Bhubaneswar, India |
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Abstract: | The effect of static electric field on the formation and annihilation of positronium in polyethylene, polystyrene, teflon,
quartz, nylon and perspex has been investigated employing a fast timing spectrometer with prompt resolution (fwhm) ∼200 ps
at the positron experimental settings. No significant variation in the lifetime of the long lived pick-off component with
electric field has been observed. The intensity of the long-lived pick-off component decreases with increase of the field
in all the cases investigated except in nylon and perspex where the intensity remains constant with the field. The results
have been discussed in the frame work of the spur reaction model proposed by Mogensen and also in the light of the Ore gap
model, as discussed by Brandt and Wilkenfeld. Another interesting correlation seems to exist between positronium formation
and dielectric loss factor; in case of increasing loss factor there is a decrease in the effect of electric field.
Work performed at Saha Institute of Nuclear Physics, Calcutta 700009, India. |
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Keywords: | 78 70 71 60 |
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