ELECTRON-ELECTRON SCATTERING AT 500 MEV
The electron-electron differentiai scattering cross section has been measured with the use of a 500-Mev electron beam from the Stanford Mark III linear electron accelerator. Deviations were sought from the theoretical cross section as calculated in first-order perturbation theory (Moller scattering). The experimental results were compared with the Moller formula as corrected to the next order in perturbation theory by the work of Tsai. Atomic electrons in a beryllium target foil constituted the target for the electron-electron scattering. The scattered electrons passed through a slit system which defined the angle of scattering and the solid angle. After the particles passed through the slit system, they entered a double-focusing magnetic spectrometer, which analyzed the scattered particles in momentum. The electrons emerging from the spectrometer were detected by a liquid Cerenkov counter. The incident beam was monitored with the use of a Faraday cup and an electronic current integrator. In order to enhance the accuracy of the experiment, the experimental electron-electron scattering was compared to the elastic electron scattering from the target nuclei (Mott scattering). The cross section was measured at approximately 2.6, 3.5 and 4.5 degrees in the laboratory system. These angles correspond to approximately 90, 107, and 120 deg in the center-of-mass system respectively, The theoretical magnitude of the radiative corrections is -5.5, -4.9, and --4.9% for the scattering angles 2.6, 3.5, and 4.5 deg respectively. The average experimental deviation from the Moller formula found for the above angles was --3.0 ( plus or minus 2.3)%, -3.5 ( plus or minus 2.9)%, and --5.9 ( plus or minus 2.3)%, respectively, where the error cited is total statistical error. In addition to the statistical error there is a maximum estimated plus or minus 2% possible systematic error. (auth)
- Research Organization:
- Stanford Univ., Calif.
- NSA Number:
- NSA-15-031540
- OSTI ID:
- 4839685
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Vol. Vol: 123; Other Information: Orig. Receipt Date: 31-DEC-61
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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