Study of dE/dx in a Drift Chamber with He-C2H6 Gas Mixture.

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  • Emi Keiko
    Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184
  • Tsukamoto Toshifumi
    KEK, National Laboratory for High Energy Physics, Tsukuba, Ibaraki 305
  • Hirano Hiroyuki
    Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184
  • Mamada Haruhiko
    Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184
  • Sakai Yoshihide
    KEK, National Laboratory for High Energy Physics, Tsukuba, Ibaraki 305
  • Uno Shoji
    KEK, National Laboratory for High Energy Physics, Tsukuba, Ibaraki 305
  • Itami Shunsuke
    Department of Physics, Nagoya University, Chikusa–ku, Nagoya 464
  • Kajikawa Ryoichi
    Department of Physics, Nagoya University, Chikusa–ku, Nagoya 464
  • Nitoh Osamu
    Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184
  • Ohishi Noritsugu
    Department of Physics, Nagoya University, Chikusa–ku, Nagoya 464
  • Sugiyama Akira
    Department of Physics, Nagoya University, Chikusa–ku, Nagoya 464
  • Suzuki Shiro
    Department of Physics, Nagoya University, Chikusa–ku, Nagoya 464
  • Takahashi Kaoru
    Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184
  • Tamagawa Yoichi
    Faculty of Engineering, Fukui University, Bunkyo, Fukui 910
  • Tomoto Makoto
    Department of Physics, Nagoya University, Chikusa–ku, Nagoya 464
  • Yamaki Tetsuji
    School of Sciences, Sugiyama Jyogakuin University, Nissin, Aichi 470–01

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  • Study of dE dx in a Drift Chamber with
  • Study of<b><i>d</i></b><i><i>E</i></i>/<b><i>d</i></b><i><i>x</i></i>in a Drift Chamber with He-C<sub><b>2</b></sub>H<sub><b>6</b></sub>Gas Mixture

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We studied dE/dx in a small-celldrift chamber filled with a gas mixture of 50% He and 50% C2H6. The dE/dx resolution, measured in terms of the 80% truncated mean of 41 layer samples, was 5.2% when the incident angle of the track with respect to the wire direction was 45°.The βγ dependence showed asmaller relativistic rise than in the case of P-10 gas.At an incident angle of 90°, we observed gas gain saturationdue to the space charge effect. Although thismakes the βγ dependence of dE/dx weaker, thedE/dx resolution was improved. As a result, a π-K separation of 2σ is achieved at all incident anglesfor 2 GeV/c tracks.

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