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Positron Scattering at Thermal Energies

100%

Fedus K., Karwasz G.

vol. 125

issue 3

829-832

Modified effective range theory in analytical form is used to extrapolate elastic cross-sections down to thermal energies for positron scattering from five atomic and molecular targets including Ar, H_2, N_2, C_6H_6 (benzene) and C_6H_{12} (c-hexane). The derived scattering parameters are then used to estimate the annihilation rates for chosen elements using a simple formula by Gribakin. We show that a combination of two simple models has a potential for accurate parameterization of coefficients describing the interaction of thermal positrons with non-polar targets of low polarizability such as Ar and N_2.

Positronium Formation in Organic Liquids

71%

Karbowski A., Fedus K., Służewski K., Bruzdowska J., Karwasz G.

Acta Physica Polonica A

2017

vol. 132

issue 5

1466-1469

This paper reports on the results of positron annihilation lifetime measurements of three organic liquids: benzene (C₆H₆), cyclohexane (C₆H₁₂), and methanol (CH₃OH). The lifetime spectra are acquired at different temperatures for non-degassed, degassed, and oxygen-saturated samples, at temperatures between 5°C and 25°C. The spectra are analyzed using a standard three-exponential model. The influence of oxygen on each lifetime and intensity component is discussed.

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2 Acta Physica Polonica A

1 2017

1 2014

2 Fedus K.

2 Karwasz G.

1 Bruzdowska J.

1 Karbowski A.

1 Służewski K.

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Positron Scattering at Thermal Energies

Positronium Formation in Organic Liquids