Performance test of the MAIKo active target

T. Furuno; T. Kawabata; H. J. Ong; S. Adachi; Y. Ayyad; T. Baba; Y. Fujikawa; T. Hashimoto; K. Inaba; Y. Ishii; S. Kabuki; H. Kubo; Y. Matsuda; Y. Matsuoka; T. Mizumoto; T. Morimoto; M. Murata; T. Sawano; T. Suzuki; A. Takada; J. Tanaka; I. Tanihata; T. Tanimori; D. T. Tran; M. Tsumura; H. D. Watanabe

doi:10.1016/j.nima.2018.08.042

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arXiv · 1809.02287

Performance test of the MAIKo active target

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Abstract

A new active target named MAIKo (Mu-PIC based Active target for Inverse Kinematics$_{\circ}$) has been developed at Kyoto University and Research Center for Nuclear Physics (RCNP), Osaka University. MAIKo is suited for missing-mass spectroscopy of unstable nuclei at forward scattering angles in inverse kinematics. MAIKo consists of a time projection chamber (TPC), which incorporates a micro-pixel chamber ($\mu$-PIC) as the electron multiplication and collection system. In MAIKo, the medium gas also plays the role of a reaction target, thus allowing detection of low-energy recoil particles with high position resolution. The MAIKo TPC was commissioned with He(93%)+iso-C$_{4}$H$_{10}$(7%) and He(93%)+CO$_{2}$(7%) mixture gasses at 430 hPa. The gas gain and the angular resolution of MAIKo were evaluated with an alpha source and a $^{4}$He beam at 56 MeV. The TPC was stably operated up to 1000-kcps beam intensity. A tracking algorithm using the Hough transform method has been developed to analyze scattering events. An angular resolution of 1.3$^{\circ}$ was achieved for scattered $^{4}$He particles.

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T. Furuno, T. Kawabata, H. J. Ong, S. Adachi, Y. Ayyad, T. Baba, Y. Fujikawa, T. Hashimoto, K. Inaba, Y. Ishii, S. Kabuki, H. Kubo, Y. Matsuda, Y. Matsuoka, T. Mizumoto, T. Morimoto, M. Murata, T. Sawano, T. Suzuki, A. Takada, J. Tanaka, I. Tanihata, T. Tanimori, D. T. Tran, M. Tsumura, H. D. Watanabe. 2018-09-07. Performance test of the MAIKo active target. https://doi.org/10.1016/j.nima.2018.08.042

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