Development of a New Injection Trap System for Mass Measurements of the Most Exotic Isotopes at the FRS Ion Catcher, GSI

近年来，一种新型质谱仪（所谓的多重反射飞行时间质谱仪）已被引进，并在几乎所有主要的放射性束设施中非常成功地投入运行。在这些设备中，通过将离子存储在两个静电离子镜之间来实现长飞行路径（高达一公里的路径长度）。此外，这些装置不仅能够进行质量测量，而且还可以用于识别和量化放射性衰变后的反应产物或子体核素。在达姆施塔特，德国目前的GSI设施的FRS离子捕集器实验作为未来LEB的测试台，并允许精度研究现在。与FRS Ion Catcher合作寻找通过相对论能量的Pb碎裂或通过多核转移反应产生的新同位素。这些实验的主要目标将是产生和确定铽和铅之间元素范围内的新的富中子同位素，并测量其产生截面、质量和半衰期。特别是，新的质量值将与快速中子俘获过程（r过程）的第三个峰值高度相关，据信这是产生铁以外一半稳定同位素的原因。

In recent years a new type of mass spectrometer (so called multiple-reflection time-of-flight mass spectrometer) has been introduced and very successfully brought into operation at almost all major radioactive beam facilities. In these devices long flight path (up to a km of path length) are achieved by storing ions between two electrostatic ion mirrors. Further, these devices are not only capable of performing mass measurements, but can also be used to identify and quantify reaction products or daughter nuclides following radioactive decays. The FRS Ion Catcher experiment at the current GSI facility, Darmstadt, Germany serves as the test bench for the future LEB and allows precision studies already now. Joining forces with the FRS Ion Catcher collaboration in the search for new isotopes being produced via Pb fragmentation at relativistic energies or via multinuclear transfer reactions. The main goal of these experiments will be to produce and identify new neutron-rich isotopes in the element range between terbium and lead and to measure their production cross sections, masses and half-lives. Particular the new mass values will be highly relevant for the third peak of the rapid neutron capture process (r-process), which is believed to be responsible for the creation of half of the stable isotopes beyond iron.