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

Keiko Emi; Toshifumi Tsukamoto; Hiroyuki Hirano; Haruhiko Mamada; Yoshihide Sakai; Shoji Uno; Shunsuke Itami; Ryoichi Kajikawa; Osamu Nitoh; Noritsugu Ohishi; Akira Sugiyama; Shiro Suzuki; Kaoru Takahashi; Yoichi Tamagawa; Makoto Tomoto; Tetsuji Yamaki

doi:10.1143/jpsj.65.657

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

Keiko Emi, Toshifumi Tsukamoto, Hiroyuki Hirano, Haruhiko Mamada, Yoshihide Sakai, Shoji Uno, Shunsuke Itami, Ryoichi Kajikawa, Osamu Nitoh, Noritsugu Ohishi, Akira Sugiyama, Shiro Suzuki, Kaoru Takahashi, Yoichi Tamagawa, Makoto Tomoto, Tetsuji Yamaki

Author information

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

Keywords: dE}/dx, drift chamber, particle identification, helium, ethane

JOURNAL RESTRICTED ACCESS

1996 Volume 65 Issue 3 Pages 657-660

DOI https://doi.org/10.1143/jpsj.65.657

Details

Abstract

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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