Energy-control and novel particle-identification methods combined with range in a multi-sampling ionization chamber for experiments using slowed-down RI beams

T. Sumikama, D. S. Ahn, N. Fukuda, Y. Shimizu, H. Suzuki, H. Takeda, H. Wang, K. Yoshida, J. Amano, N. Chiga, K. Chikaato, A. Hirayama, N. Inabe, S. Kawase, S. Kubono, M. Matsushita, S. Michimasa, K. Nakano, H. Otsu, H. SakuraiA. Saito, S. Shimoura, J. Suwa, M. Takechi, S. Takeuchi, Y. Togano, T. Tomai, Y. Watanabe

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Abstract

A method for controlling the energy of slowed-down RI beams with the goal energy of 20 MeV/u was developed at the RIKEN RI Beam Factory. The 93Zr beam energy was successfully tuned to 20.2 MeV/u in a single step by adjusting its momentum selected by the first dipole magnet after a primary target. A method for particle identification was developed for the secondary reaction fragments at 50 MeV/u. The dispersive mode was applied to the ZeroDegree spectrometer to measure the momentum at the final focus F11. The reaction fragments were stopped in the multi-sampling ionization chamber (MUSIC) placed at F11, which measured the ΔE−E of the beam particles. In addition, the range R in MUSIC was determined with a resolution of 1.4 mm (σ) by using the energy ratio obtained from multi-sampled energy deposits. The atomic number was determined from the E−R correlation with a resolution of 0.15 (σ). To distinguish the charge state of the RI beam after the secondary reaction target, the range with the correction for the β dependence was combined with the mass-to-charge ratio determined from the time-of-flight and magnetic-rigidity measurements. A 5.6 σ separation was obtained between 92Zr40+ and 90Zr39+ using these two values.

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

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