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Beam quality: no data Target: The chamber was filled with 150 Torr natural helium gas of 99.999% purity. A 2.54 mcm Havar foil separated the Faraday cup vacuum from the He chamber. Data obtained: author graph (digitized with GSYS 2.4)The measurements were carried out at the University of Wisconsin tandem accelerator laboratory. A 0.5 mcm Ni entrance foil was used to separate the He chamber from the beamline vacuum.