Positron Scattering on Atoms and Molecules in the Limit of Low Energy

• Authors: G. Karwasz , R. Brusa , D. Pliszka , Z. Idziaszek , H. Nowakowska
• Languages of publication: EN

Abstracts

EN

Starting from experimental cross-sections for positron scattering in argon and nitrogen, we examine different energy ranges. In the zero-energy limit the cross-section falls with energy and can be described by modified effective range theory for polarization potential. In a few eV range the cross-sections are constant vs. energy. As far as it is possible to force the elastic scattering phase shifts in a way that both experimental differential cross-sections are reproduced and the total cross-section remains constant in energy, such a model lacks the physical justification. Only the virtual-positronium model, developed recently by Gribakin, reproduces a constant dependence of the total cross section in a few eV energy range.

Keywords

EN

34.85.+x; 39.90.+d

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2006
• Volume: 110
• Issue: 5
• Pages: 605-614

Dates

published

2006-11

received

2006-06-05

Contributors

author

G. Karwasz

• Institute of Physics, Nicolaus Copernicus University, Grudziądzka 5/7, 87-600 Toruń, Poland

author

R. Brusa

• Physics Department, Trento University, Sommarive 14, 38050 Trento, Italy

author

D. Pliszka

• Institute of Physics, Pomeranian Pedagogical Academy, 76-200 Słupsk, Poland

author

Z. Idziaszek

• CNR-INFM BEC Center, 38050 Trento Italy
• Center of Theoretical Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

author

H. Nowakowska

• Institute of Fluid Flow Machinery, Polish Academy of Sciences, Fishera 14, 80-952 Gdańsk, Poland

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Identifiers

DOI

10.12693/APhysPolA.110.605