Investigation of anomalous spectral structure in low-energy positron scattering

Abstract

Scattering of low-energy positrons on a thorium target has been investigated. The positron-electron energy spectrum in the interval 265-425 keV is best described in terms of Bhabha scattering with the addition of a small peak at about 330 keV for both the positrons and the electrons. The evidence for this peak is not considered conclusive.