Level measurement nucleonic

The background count rate at 5,000 feet above sea level measured in this laboratory is 22 percent higher than the rate at sea level, using a similar instrument and operational conditions. The increased background is caused by cosmic ray produced muons and nucleons. Shielding experiments and an analysis of the background components are presented. 

A first version of the experimental set-up was successfully used at CERN on LEAR (Low Energy Antiproton Ring), to study 3d -> 2p transitions in antiprotonic hydrogen and deuterium [4], to obtain information on the antiproton-nucleon interaction. It was also used to measure the mass of the charged pion for the first time in a low density gas, using transitions between circular levels of pionic nitrogen [5], using copper Ka transitions as X-ray standards. 

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