A new series of neutron-rich indium mass measurements is reported from the TITAN multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). These mass measurements cover ${}^{125-134}\mathrm{In}$ ($N=76–85$) and include ground states as well as isomeric states. The masses of nuclei in this region are known to be of great importance for accurately modeling $r$-process nucleosynthesis, and the significance of the reported neutron-rich indium masses is discussed in this context. Results are compared with earlier experimental data where available as well as theoretical mass models. The measurements reported here include the first mass measurements of ${}^{133,134}\mathrm{In}$, as well as the first direct mass measurement of ${}^{132}\mathrm{In}$. The masses of ${}^{125-131}\mathrm{In}$ ground states and several isomers were previously measured to higher precision by Penning trap mass spectrometry, which also resolved some low-lying isomers that could not be resolved in this work. The earlier Penning trap measurements serve as excellent cross-checks for the MR-TOF-MS measurements, and in some cases the MR-TOF-MS measurements improve the literature uncertainties of higher-lying isomer masses and excitation energies. A new isomeric state for ${}^{128}\mathrm{In}$, recently reported for the first time by the JYFLTRAP group, is also confirmed by the TITAN MR-TOF-MS, with a measured excitation energy of 1813(17) keV.

中文翻译：

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富中子铟同位素质量测量的过程研究

TITAN多反射飞行时间质谱仪（MR-TOF-MS）报告了一系列新的富中子铟质量测量。这些质量测量涵盖${}^{125-134}在$ （$ñ=76–85$），包括基态和异构态。已知该区域中的原子核质量对于精确建模非常重要$\mathrm{[R}$-过程核合成，并在这种情况下讨论了报道的富中子铟质量的意义。将结果与可用的早期实验数据以及理论质量模型进行比较。此处报告的测量结果包括${}^{133，134}在$以及第一个直接质量测量 ${}^{132}在$。群众${}^{125-131}在$潘宁阱质谱仪以前曾测定了基态和几种异构体的精确度，这也解决了一些低洼的异构体，而这在这项工作中是无法解决的。较早的Penning阱测量可作为MR-TOF-MS测量的出色交叉检查，在某些情况下，MR-TOF-MS测量可改善较高异构体质量和激发能的文献不确定性。的新异构状态${}^{128}在$TITAN MR-TOF-MS也证实了JYFLTRAP小组最近首次报道的，其测得的激发能为1813（17）keV。