An Effective Method for Identifying Decay Events in Storage Rings and Its Application in 94mRu44+Lifetime Measurement
The Lanzhou Heavy Ion Accelerator Cooling Storage Ring(HIRFL-CSR)is an ideal device for studying the decay of highly charged and short-lived isomers.In the lifetime measurement experiment of the short-lived highly charged ion 94mRu44+,we directly observed the decay of 94Ru from 8+isomer to the ground state,and identified 49 decay events in the ob-servation time window of(20 μs,180 μs).In order to identify more decay events,a new method based on amplitude of fre-quency spectrum was studied in this paper.Based on the simulation results,this new method can effectively identify decay events within(15 μs,185 μs).By applying the new identification method to the experimental data processing,54 decay events were identified within(15 μs,185 μs).Based on these 54 decay events,the lifetime of 94mRu44+in the laboratory frame was calculated to be 194(121)μs.The new lifetime result is within the error range of the previous result 218(148)μs.
HIRFL-CSRisochronous mass spectrometryfully stripped ions94mRulifetime measurements
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