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GEM-MSTPC; An Active-target type detector in low-pressure He/CO$$_{2}$$ mixed gas

Ishiyama, Hironobu*; Yamaguchi, Kanako*; Mizoi, Yutaka*; Watanabe, Yutaka*; Das, S. K.*; Hashimoto, Takashi*; Miyatake, Hiroari*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Oyaizu, Mitsuhiro*; Jeong, S. C.*; Fukuda, Tomokazu*; Mitsuoka, Shinichi; Makii, Hiroyuki; Sato, Tetsuya

We developed an active-target type gas counter operating with low He/CO$$_{2}$$ (10%) detector gas for application in studying low-energy nuclear reactions using radioactive beams. A 400-$$mu$$m-thick gas electron multiplier (THGEM) was used as the proportional counter for high injection rate capability. We examined the gas gain stability and the influence of ion feedback on particle tracks at high beam injection rates of up to 10$$^{5}$$ particles per second (pps) using a low-energy $$^{12}$$C beam. From the result of this examination, we found that the THGEM was found to be applicable for our active target at high injection rates of up to 10$$^{5}$$ pps.

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