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 {\sigma}Z~0.19 and the mass-to-charge ratio A/Q resolution of {\sigma}A/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.
@article{arxiv.2106.04760,
title = {Improving the particle identification of radioactive isotope beams at the RIBLL2 separator},
author = {Fang Fang and Shuwen Tang and Shitao Wang and Xueheng Zhang and Zhiyu Sun and Yuhong Yu and Duo Yan and Shuya Jin and Yixuan Zhao and Shaobo Ma and Yongjie Zhang},
journal= {arXiv preprint arXiv:2106.04760},
year = {2021}
}
Comments
12 pages, 6 figures, accepted for publication in Nuclear Physics Review