Proton Stopping Power of Solid Beryllium

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Abstract
The energy loss of protons penetrating beryllium foils of different thicknesses has been determined as a function of the proton energy by measuring the shift of those potentials at which a thin aluminum target gives resonance radiation. The experimental points fit within ±2 percent a theoretical curve corresponding to an average ionization energy of 64±5 ev, which is in agreement with a recent theory for the stopping power of metals.

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