XXth International Conference on Neutrino Physics and Astrophysics

Poster Abstract

Energy Calibration of the Texas Neutrino Mass Experiment by Electron Diffraction

Due to the cylindrical arrangement of our experiment including the gas cell we will be able to calibrate the series of electron spectrometers with elastic electron scattering. An electron beam generated with a telefocus electron gun will cross our gas cell filled with T_2 at 30K and suitable pressure (in the range of 10 Pascal). The primary unscattered electrons will be trapped by a Woods horn. The scattered electrons will enter the ring-slits of the spectrometers at angles varying from close to zero degrees scattering angle to about 90 degrees. The electrons with the proper energy will reach the detector. The azimuthal intensity distribution at the exit slit represents the differential elastic cross section. It contains the information of the diffraction of the double slit T_2. The oscillatory component of the scattered intensity is given by the product of the de Broglie wavelength and the bond length of T_2. Since the latter is known to better than 1 part in 100,000. We can determine the energy of the transmitted electrons to the same precision. The poster will show current results from a different unit and the limiting factors.

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