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To improve the ability of particle identification of the RIBLL2 separator atthe HIRFL-CSR complex, a new high-performance detector for measuring fragmentstarting time and position at the F1 dispersive plane has been constructed andinstalled, and a method for achieving precise B\r{ho} determination has beendeveloped using the experimentally derived ion-optical transfer matrix elementsfrom the measured position and ToF information. Using the high-performancedetectors and the precise B\r{ho} determination method, the fragments producedby the fragmentation of 78Kr at 300 MeV/nucleon were identified clearly at theRIBLL2-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 greatimprovement will increase the collection efficiency of exotic nuclei, extendthe range of nuclei of interest from the A<40 mass region up to the A~80 massregion, and promote the development of radioactive nuclear beam experiments atthe RIBLL2 separator.

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