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Low Energy Cross-Sections for Positron Interactions with Cyclic Hydrocarbons

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Karwasz G., Pliszka D., Brusa R., Perazzolli C.
Acta Physica Polonica A
|
2005
|
vol. 107
|
issue 4
666-672
EN
We report total cross-section measurements for positron scattering on cyclic hydrocarbons: benzene, aniline, and cyclohexane. Measurements were done by an absolute transition method in the energy range 1.5-20 eV (0.4-20 eV for cyclohexane). High cross-sections for all measured molecules were observed at low energies. In the case of cyclohexane the cross-section in the zero energy limit tends to a constant value. In aniline a weakly accented peak slightly above the positronium formation threshold is observed. Similar but less visible bump was observed in the case of benzene. Measurement of total cross-sections in nitrogen and argon used for calibration of the apparatus are also presented.
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