论文标题
直接确定准稳定ISomer $^{1.80m} $ ta的激发能量
Direct determination of the excitation energy of quasi-stable isomer $^{180m}$Ta
论文作者
论文摘要
$^{1.80m} $ ta是一种自然丰富的准稳定核素，也是迄今已知的最长的核异构体。对于寻找暗物质，开发伽玛激光器和天体物理学的搜索，这是感兴趣的。到目前为止，其激发能尚未直接测量，而是基于对可用核反应数据的评估。我们使用PENNING-TRAP质谱仪Jyfltrap确定了该异构体的激发能量，其精度很高。 $^{180} $ ta的地面和异构体状态之间确定的质量差异产生了76.79（55）kev的激发能量，以$^{1.80m} $ ta。这是激发能量的第一个直接测量，并提供了比以前的评估值75.3（14）KEV更好的精度。
$^{180m}$Ta is a naturally abundant quasi-stable nuclide and the longest-lived nuclear isomer known to date. It is of interest for, among others, the search for dark matter, for the development of a gamma laser and for astrophysics. So far, its excitation energy has not been measured directly but has been based on an evaluation of available nuclear reaction data. We have determined the excitation energy of this isomer with high accuracy using the Penning-trap mass spectrometer JYFLTRAP. The determined mass difference between the ground and isomeric states of $^{180}$Ta yields an excitation energy of 76.79(55) keV for $^{180m}$Ta. This is the first direct measurement of the excitation energy and provides a better accuracy than the previous evaluation value, 75.3(14) keV.
