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(e<sup>+</sup>, He) Total Scattering
49
Citations
0
References
1972
Year
Cross SectionEngineeringNuclear PhysicsPositron Annihilation SpectroscopyAccelerator PhysicHeavy Ion PhysicPositronium Formation ThresholdLepton-nucleon ScatteringPhysicsAtomic PhysicsInverse Scattering TransformsParticle Beam PhysicsNuclear AstrophysicsEnergy IntervalsExperimental Nuclear PhysicsNatural SciencesRadar ScatteringParticle PhysicsWave ScatteringApplied PhysicsLight ScatteringCollective InstabilitiesBeam Transport System
The total scattering cross section for e + in He has been measured through two energy intervals, 1 to 4 eV and 17 to 26 eV. Through the lower elastic-scattering interval our results are consistent with the calculations of Drachman. From below the positronium formation threshold, at 17.8 eV to above the He ionization threshold, our results agree qualitatively with the calculations of Kraidy, who includes in his model virtual positronium and positronium polarization. Just below 17.8 eV the cross section is 0.35 ± 0.04 πa 0 2 . In these experiments a high-current linac has been used as a source of positrons and total beam attenuation has been used to determine the cross section.