## XXth International Conference on Neutrino Physics and Astrophysics

**
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.