Energy-control and novel particle-identification methods combined with range in a multi-sampling ionization chamber for experiments using slowed-down RI beams
Energy-control and novel particle-identification methods combined with range in a multi-sampling ionization chamber for experiments using slowed-down RI beams
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能量控制和新颖的粒子识别方法与多采样电离室中的范围相结合，用于使用慢速 RI 光束进行实验
DOI：
10.1016/j.nima.2020.164687
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
S. Kubono et al.
中科院分区：
文献类型：
--
作者：
T. Sumikama;S. Kubono et al.
RIKEN RI 光束工厂开发了一种控制减速 RI 光束能量的方法，目标能量为 20 MeV/u。通过调整主要目标后的第一个偶极磁体所选择的动量，将 93 Zr 束能量成功地一步调整到 20.2 MeV/u。开发了一种针对 50 MeV/u 次级反应碎片的粒子识别方法。将色散模式应用于零度光谱仪来测量最终焦点 F11 处的动量。反应碎片在位于 F11 的多重采样电离室 (MUSIC) 中停止，测量束粒子的 Δ E− E。此外，MUSIC 中的范围 R 通过使用从多采样能量沉积获得的能量比以 1.4 mm (σ) 的分辨率确定。原子序数由 E−R 相关性确定，分辨率为 0.15 (σ)。为了区分二次反应目标后 RI 光束的电荷状态，将β依赖性校正的范围与根据飞行时间和磁刚度测量确定的质荷比相结合。使用这两个值在 92 Zr 40+ 和 90 Zr 39+ 之间获得 5.6 σ 的分离度。
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 93 Zr 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 Δ E− 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 92 Zr 40+ and 90 Zr 39+ using these two values.