Physics – Atomic and Molecular Clusters
Scientific paper
1999-11-23
Phys.Rev. A59 (1999) 4829-4832
Physics
Atomic and Molecular Clusters
4 latex pages, 3 postscript figures
Scientific paper
10.1103/PhysRevA.59.4829
Very low-energy scattering of orthopositronium by helium has been investigated for simultaneous study of elastic cross section and pick-off quenching rate using a model exchange potential. The present calculational scheme, while agrees with the measured cross section of Skalsey et al, reproduces successfully the parameter $^ 1Z_{\makebox{eff}}$, the effective number of electrons per atom in a singlet state relative to the positron. Together with the fact that this model potential also leads to an agreement with measured medium energy cross sections of this system, this study seems to resolve the long-standing discrepancy at low energies among different theoretical calculations and experimental measurements.
Adhikari Sadhan K.
Biswas Prasanta K.
Sultanov Renat A.
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