Adhikari, Sadhan K. [UNESP]Biswas, P. K. [UNESP]Sultanov, R. A. [UNESP]2022-04-282022-04-281999-01-01Physical Review A - Atomic, Molecular, and Optical Physics, v. 59, n. 6, p. 4829-4832, 1999.1094-16221050-2947http://hdl.handle.net/11449/223806Very-low-energy scattering of orthopositronium by helium has been investigated for the simultaneous study of elastic cross section and pickoff quenching rate using a model exchange potential. The present calculational scheme, while it agrees with the measured cross section of Skalsey et al., reproduces successfully the parameter [Formula Presented] 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. © 1999 The American Physical Society.4829-4832engArtigo10.1103/PhysRevA.59.48292-s2.0-0000083641