Atomic mass determination of uranium-238

• DOI: 10.48550/arxiv.2312.17041
• Publication Date: 2023-01-01
• Authors: Kathrin Kromer; Chunhai Lyu; Jacek Bieroń; Menno Door; Lucia Enzmann; P. Filianin; Gediminas Gaigalas; Zoltán Harman; Jost Herkenhoff; W. J. Huang; Christoph H. Keitel; S. Eliseev; K. Blaum
• Keywords: Nuclide; Atomic mass; Penning trap

The atomic mass of uranium-238 has been determined to be $238.050\,787\,618(15)\,\text{u}$, improving the literature uncertainty by two orders magnitude. It is obtained from a measurement ratio $^{238}$U$^{47+}$ and $^{132}$Xe$^{26+}$ ions with an $3.5\times 10^{-12}$. was carried out Penning-trap spectrometer \textsc{Pentatrap} accompanied calculation binding energies $E_{\text{U}}$ $E_{\text{Xe}}$ 47 26 missing electrons highly charged ions, respectively. These were using \textit{ab initio} multiconfiguration Dirac-Hartree-Fock (MCDHF) method $E_{\text{U}} = 39\,927(10)\,\text{eV}$ $E_{\text{Xe}} 8\,971.2(21)\,\text{eV}$. new value will serve as reference for high-precision measurements in heavy region nuclear chart up transuranium nuclides.