The upcoming operation of the Extra Low ENergy Antiprotons (ELENA) ring at CERN, the upgrade of the anti-proton decelerator (AD), and the installation in the AD hall of an intense slow positron beam with an expected flux of $10^{ 8}$ e$^+$/s will open the possibility for new experiments with anti-hydrogen ($\bar{ \text{ H}}$). Here we propose a scheme to measure the Lamb shift of $\bar{ \text{ H}}$. For a month of data taking, we anticipate an uncertainty of 100 ppm. This will provide a test of CPT and the first determination of the anti-proton charge radius at the level of 10%.
Categories: physics.atom-ph hep-ex