Speaker
Description
Nuclear mass is one of the most important input for nucleosynthesis calculations at extreme conditions. However, the masses of exotic isotopes usually have large uncertainties since they are only predicted by various models due to the difficulties in the measurements that originate from their short life-times and low production cross sections. The precise mass of exotic nucleus may provide new insights of nuclear structure as well. Recently, a few approaches have been developed for precise mass measurements. With the advantages of single-ion sensitivity, large mass range, short measurement time, and less expensive construction cost, the multi-reflection time-of-flight mass spectrometer (MRTOF-MS) is considered as a modern technique for precise mass measurement of exotic nuclei and molecules. The mass analyzer is accomplished by using two electrostatic mirrors in a coaxial arrangement to reflect the ions axially and focus them transversally to achieve a stable trajectory. In this work, we showed the optimized potentials on the electrodes of the mass analyzer in both of the mirror-switching and in-trap-lift modes with the kinetic energy of 1.5 keV. The effect of operating conditions, i.e., numbers of reflections, statistics, and beam size, were also investigated. The result shows that the resolving power may be changed by a few factors due to a deviation of 10 percent in the beam size. The results in the present study would be useful for operating MR-TOF spectrometers at RI beam facilities, i.e., RAON, in the future.
Key words: atomic mass, exotic-isotopes, mass analyzer, RI beam
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