Abstract
Helium based gas mixtures are particularly interesting since they have a good tracking resolution because of the reduced multiple scattering. We have studied the differential energy loss d E/d x in several mixtures, He–isobutane and He–ethane. We present results from measurements performed with electrons, pions and protons in the momentum range between 1 and 5 GeV/ c obtained in a prototype drift chamber with a 3 cm cell. The results show that helium performs well in measuring energy losses for charged particles.
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