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

TL;DR

This paper presents a new high-performance detector and a precise B {ho} determination method at RIBLL2, significantly enhancing particle identification of radioactive isotope beams and expanding research capabilities.

Contribution

Introduction of a novel detector system and a B {ho} determination technique that improve isotope identification at RIBLL2.

Findings

Achieved Z resolution of ~0.19 for 75As33+

Obtained A/Q resolution of ~5.8e-3

Extended the range of nuclei studied up to A~80

Abstract

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.