Thickness measurement of ammonia targets used in SLAC E143 experiment
Garvey, David Raymond
Maruyama, Xavier K.
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One of the primary research tools in high energy physics is the collision of beams of particles with stationary targets. The jful information that may be extracted from such experiments is proportional to knowledge of the thickness of the target. This termines how many point constituents were available for the particles in the beam to interact with. It is possible to determine thickness of a target with statistical errors of the order of one percent by the use of x-ray attenuation measurements. Six target samples from the Stanford Linear Accelerator Center Experiment #143, "Nucleon Spin Structure at 30 GeV," were :asured using this method. The targets were frozen ammonia crystals. A 40 mCurie americium 241 source was used to pass a imated beam of known intensity x-rays through the samples. The x-ray intensity on the other side was measured by a silicon 1 detector. The ammonia material was removed and the process repeated. By comparing the intensities with and without the iterial to the tabulated attenuation coefficients, the thickness of material is calculated.
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