IFIMAR   20926
INSTITUTO DE INVESTIGACIONES FISICAS DE MAR DEL PLATA
Unidad Ejecutora - UE
artículos
Título:
Extracting interaction parameters from near threshold positron experiments
Autor/es:
P. A. MACRI; R. O. BARRACHINA
Revista:
Nuclear Instruments and Methods in Physics Research Section B
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2009 vol. 267 p. 254 - 254
ISSN:
0168-583X
Resumen:
We analyze different methods to extract, from experiments, positron-atom interaction parameters such as the scattering length and the effective range. The near-threshold distributions of positrons in positronium formation or elastic scattering have in common an s-wave evolution in an effective polarization potential. DiĀ®erent generalizations of the effective range theory are used in the literature to fit the experimental data. In this work, we propose a different approach that provides a signifficant improvement over other methods on a much broader range of energies. We discuss the applicability of this method for extracting information on low-energy electron-atom interactions in the case of positronium formation and elastic collisions involving positrons.
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