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In 1954, Ashkin, Page and Woodward (hereafter APW) reported on the firstcounter experiments to measure the electron-electron and electron-positronscattering cross-sections at low relativistic energies (0.6-1.7 MeV). Their aimwas to look for the spin and exchange or virtual annihilation effects predictedby the Moller and Bhabha formulae. Their experiments confirmed these effects,but the measured cross-sections at 0.61 MeV were significantly smaller thantheir predicted values. The authors remarked that these deviations were`presumably due to multiple scattering'. However, careful reading of theunpublished theses of Page (1950) and Ashkin (1952), Page's letter (1951) andthe APW paper reveals no credible evidence of multiple scattering at 0.61 MeV;if anything, the evidence rules against multiple scattering. If multiplescattering is ruled out, the observations may indicate a departure from quantumelectrodynamics. This departure may be due to a non-Coulomb central force, aweakening of the spin-statistics connection, or both. Only experiment can tellwhich of these possibilities holds true, and therefore we suggest the newelectron-electron scattering experiments be carried out at different energies(at 0.4-1.0 MeV) and different scattering angles, as well as specific tests formultiple scattering. We consider a non-Coulomb central force to be veryunlikely, and advance the hypothesis that a fraction of the electron pairsscatter as spin-zero fermions (which would lower the observed cross-section).Numerical calculations show that the hypothesis may be tested quantitatively ina Page-type experiment, even with little improvement in the accuracy heachieved in 1950.

Possible violation of spin-statistics connection in electron-electron scattering at low relativistic energies