Βρ-defined isochronous mass spectrometry at the storage ring CSRe

A novel technique of isochronous mass spectrometry (IMS), termed \(B\rho\) $B\rho$ -defined IMS, was developed at the experimental cooler-storage ring CSRe in Lanzhou for the first time. Two time-of-flight detectors were installed in a straight section of the CSRe, thereby enabling simultaneous measurements of the velocity and revolution time of each stored short-lived ion. This technique boosts the broadband precision, efficiency, sensitivity, and accuracy of mass measurements of short-lived exotic nuclides. Using \(B\rho\) $B\rho$ -defined IMS, the masses of \(^{22}\hbox {Al}\) $_{}^{22}\text{Al}$ , \(^{62}\hbox {Ge}\) $_{}^{62}\text{Ge}$ , \(^{64}\hbox {As}\) $_{}^{64}\text{As}$ , \(^{66}\hbox {Se}\) $_{}^{66}\text{Se}$ , and \(^{70}\hbox {Kr}\) $_{}^{70}\text{Kr}$ were measured for the first time, and the masses of \(^{65}\hbox {As}\) $_{}^{65}\text{As}$ , \(^{67}\hbox {Se}\) $_{}^{67}\text{Se}$ , and other 21 nuclides were redetermined with improved accuracy. Mass data have been used in studies of relevant issues regarding nuclear structures and nuclear astrophysics. Herein, we review the development of experimental techniques and main physical results and outline plans for future experiments.