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arXiv 2106.04760physics.ins-detnucl-ex
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在RIBLL2分离器上改进放射性同位素束的粒子识别

Improving the particle identification of radioactive isotope beams at the RIBLL2 separator

Fang Fang, Shuwen Tang, Shitao Wang, Xueheng Zhang, Zhiyu Sun, Yuhong Yu, Duo Yan, Shuya Jin, Yixuan Zhao, Shaobo Ma, Yongjie Zhang

摘要:

为了提高HIRFL-CSR复合体中RIBLL 2分离器的粒子识别能力,构建并安装了一种用于测量F1色散平面上碎片起始时间和位置的新的高性能探测器,并开发了一种使用实验获得的离子光学传输矩阵元从测量位置和ToF信息实现精确B \r{ho}确定的方法。利用高性能的探测器和精确的B \r{ho}测定方法,在RIBLL 2-ETF上,在全动量接受条件下,清晰地识别出了300 MeV/核子的78 Kr碎裂产生的碎片。对~(75)As ~(33+)碎片的原子序数Z分辨为σZ~0.19,质荷比A/Q分辨为σA/Q~5.8e-3。这一重大改进将提高奇异核的收集效率,使感兴趣核的范围从A<40质量区扩展到A~80质量区,并促进RIBLL 2分离器上放射性核束实验的发展。

英文摘要:

To improve the ability of particle identification of the RIBLL2 separator at the HIRFL-CSR complex, a new high-performance detector for measuring fragment starting time and position at the F1 dispersive plane has been constructed and installed, and a method for achieving precise B\r{ho} determination has been developed using the experimentally derived ion-optical transfer matrix elements from the measured position and ToF information. Using the high-performance detectors and the precise B\r{ho} determination method, the fragments produced by the fragmentation of 78Kr at 300 MeV/nucleon were identified clearly at the RIBLL2-ETF under full momentum acceptance. The atomic number Z resolution of σZ~0.19 and the mass-to-charge ratio A/Q resolution of σA/Q~5.8e-3 were obtained for the 75As33+ fragment. This great improvement will increase the collection efficiency of exotic nuclei, extend the range of nuclei of interest from the A<40 mass region up to the A~80 mass region, and promote the development of radioactive nuclear beam experiments at the RIBLL2 separator.

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