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

近年来，一种新型的质谱计(即所谓的多次反射飞行时间质谱仪)被引进，并在几乎所有主要的放射性束流设施上非常成功地投入使用。在这些设备中，通过在两个静电离子镜之间存储离子来实现长飞行路径(最长可达一公里的路径长度)。此外，这些设备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核素。目前在德国达姆施塔特的GSI设施进行的FRS离子捕捉器实验是未来LEB的试验台，现在已经可以进行精确研究。在寻找通过相对论能量下的铅碎裂或通过多核转移反应产生的新同位素方面，与FRS离子捕捉器合作。这些实验的主要目标将是在Tb和铅之间的元素范围内生产和识别新的富含中子的同位素，并测量它们的产生截面、质量和半衰期。特别是，新的质量值将与快速中子捕获过程(r过程)的第三个峰值高度相关，该过程被认为是铁以外一半稳定同位素的产生原因。

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.