Neutron-deficient iodine isotopes, \(^{116}\)I and \(^{114}\)I, were produced at relativistic energies by in-flight fragmentation at the Fragment Separator (FRS) at GSI. The FRS Ion Catcher was used to thermalize the ions and to perform highly accurate mass measurements with a Multiple-Reflection Time-of-Flight Mass-Spectrometer (MR-TOF-MS). The masses of both isotopes were measured directly for the first time. The half-life of the \(^{114}\)I was measured by storing the ions in an RF quadrupole for different storage times and counting the remaining nuclei with the MR-TOF-MS. The measured half-life was used to assign the ground state to the measured \(^{114}\)I ions. Predictions on the possible \(\alpha \)-decay branch for \(^{114}\)I are presented based on the reduced uncertainties obtained for the \(Q_{\alpha }\)-value. Systematic studies of the mass surface were performed with the newly obtained masses, showing better agreement with the expected trend in this mass region.

中文翻译：

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中子缺陷型碘同位素的质量和半衰期测量

中子缺陷型碘同位素\（^ {116} \） I和\（^ {114} \） I是通过相对论能量通过GSI碎片分离器（FRS）的飞行中碎片产生的。FRS离子捕集器用于加热离子，并使用多反射飞行时间质谱仪（MR-TOF-MS）进行高精度的质量测量。首次直接测量了两种同位素的质量。通过将离子存储在RF四极杆中不同的存储时间并用MR-TOF-MS计数剩余原子核来测量\（^ {114} \） I的半衰期。测量的半衰期用于将基态分配给测量的\（^ {114} \） I离子。对可能的\（\ alpha \）的预测\（^ {114} \）的-decay分支是基于\（Q _ {\ alpha} \）-值获得的减少的不确定性而提出的。系统对新获得的质量块进行了表面研究，显示出与该质量块区域中的预期趋势更好的一致性。