标题： 超越$^{132}$锡的精确质量测量：结合能奇偶性差异的异常行为 显示英文标题

标题： Precision Mass Measurements beyond $^{132}$Sn: Anomalous behaviour of odd-even staggering of binding energies

摘要： 中子丰富的同位素$^{121-128}$Cd、$^{129,131}$In、$^{130-135}$Sn、$^{131-136}$Sb 和$^{132-140}$Te 的原子质量已使用 Penning 磁阱质谱仪 JYFLTRAP 进行了高精度（10 ppb）测量。 其中，四个r过程核素$^{135}$Sn、$^{136}$Sb和$^{139,140}$Te的质量首次被测量。 数据揭示了在$Z$=50处存在强烈的$N$=82壳层间隙，但表明对于$Z>50$相关性的重要性。 一种通过同位素质量的奇偶性差异表示的经验中子配对间隙在锡（Sn）中跨$N$=82表现出强烈的抑制，其$Z$依赖性无法用当前的理论模型进行解释。 显示英文摘要

摘要： Atomic masses of the neutron-rich isotopes $^{121-128}$Cd, $^{129,131}$In, $^{130-135}$Sn, $^{131-136}$Sb, and $^{132-140}$Te have been measured with high precision (10 ppb) using the Penning trap mass spectrometer JYFLTRAP. Among these, the masses of four r-process nuclei $^{135}$Sn, $^{136}$Sb, and $^{139,140}$Te were measured for the first time. The data reveals a strong $N$=82 shell gap at $Z$=50 but indicates the importance of correlations for $Z>50$. An empirical neutron pairing gap expressed as the odd-even staggering of isotopic masses shows a strong quenching across $N$=82 for Sn, with the $Z$-dependence that is unexplainable by the current theoretical models.