2024/08/13 by Karol Kozioł, Kozioł, Karol, J. Rzadkiewicz +1 · 1 citation
Physics and Astronomy · #Nuclear physics research studies #Atomic and Molecular Physics #Nuclear Physics and Applications
paper · pdf · doi:10.48550/arxiv.2408.06815
Theoretical considerations are made for the nuclear excitation from the ground state to the 8 eV 229mTh isomer via near-resonant electron transitions in Sb-like (q=39+) thorium ions. The energy of the first excited atomic state (J=7/2) in the 229Th39+ ion is estimated to be 8.308±0.069 eV, which is very close to the new reference value for the 229mTh nuclear isomer energy, 8.356 eV [Zhang et al., Nature 633, 63 (2024)]. Therefore, the 229Th39+ ion provides a unique opportunity to study the nuclear excitation by electron transition process under well-defined atomic conditions in the regime of extremely low nuclear excitation energy. Our results indicate that the upper theoretical limit for the 229mTh isomer excitation rate reaches an enormous value of 1.27×1016 s-1 at resonance (Δ=0 meV), but drops many orders of magnitude for the value of electronic transition energy within its uncertainty interval. Additionally, it was shown that using an electron beam ion trap, the production of the 229Th isomer can reach rates ranging from a few to approximately 7×1019 -1.