Antiprotonic atom

With the recent advances in atomic theories and experimental techniques, the value of the information obtained from studies of atoms that are different from but similar to atomic hydrogen have increased. These studies include atomic helium, muonic hydrogen, positronium, muonium, antihydrogen, moderate Z ions, high Z ions, antiprotonic atoms and muonic atoms. 

Recently, serious progress was made in pionic and antiprotonic atoms and that gave new results about scattering lengths and the pion mass. The work with... 

The upcoming Antiproton Decelerator (AD) [1] at CERN allows the formation and precision spectroscopy of antiprotonic atoms. Among the three approved experiments, the ASACUSA collaboration [2] will as part of its program continue experiments with antiprotonic helium that were previously performed by the PS205 collaboration [3] at the now closed Low Energy Antiproton Ring (LEAR) of CERN. Antiprotonic helium consisting of an alpha particle, an antiproton, and an electron (He++ —p — = pHe+), was found to have lifetimes in the... 

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