Positron Scattering at Thermal Energies

K. Fedus and G.P. Karwasz Institute of Physics, Nicolaus Copernicus University, Grudziądzka 5/7, 87-100 Toruń, Poland

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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, H2, N2, C6H6 (benzene) and C6H12 (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 N2.

DOI: 10.12693/APhysPolA.125.829 PACS numbers: 34.80.-i, 34.80.Bm, 34.80.Uv