https://doi.org/10.1140/epja/s10050-022-00860-1
Regular Article - Experimental Physics
High-precision mass measurement of doubly magic 
Pb
1
Max-Planck-Institut für Kernphysik, 69117, Heidelberg, Germany
2
Advanced Energy Science and Technology Guangdong Laboratory, 516007, Huizhou, China
3
Ruprecht-Karls-Universität Heidelberg, 69117, Heidelberg, Germany
4
Department of Physics, St Petersburg State University, 198504, Saint Petersburg, Russia
5
NRC “Kurchatov Institute” Petersburg Nuclear Physics Institute, 188300, Gatchina, Russia
a
kathrin.kromer@mpi-hd.mpg.de
Received:
7
June
2022
Accepted:
12
October
2022
Published online:
25
October
2022
The absolute atomic mass of Pb has been determined with a fractional uncertainty of 
by measuring the cyclotron-frequency ratio R of Pb
to 
Xe
with the high-precision Penning-trap mass spectrometer Pentatrap and computing the binding energies 
and 
of the missing 41 and 26 atomic electrons, respectively, with the ab initio fully relativistic multi-configuration Dirac–Hartree–Fock (MCDHF) method. R has been measured with a relative precision of 
. and have been computed with an uncertainty of 9.1 eV and 2.1 eV, respectively, yielding 
u (
eV/c
) for the Pb neutral atomic mass. This result agrees within 
with that from the Atomic-Mass Evaluation (AME) 2020, while improving the precision by almost two orders of magnitude. The new mass value directly improves the mass precision of 14 nuclides in the region of Z = 81–84 and is the most precise mass value with 
. Thus, the measurement establishes a new region of reference mass values which can be used e.g. for precision mass determination of transuranium nuclides, including the superheavies.
© The Author(s) 2022. corrected publication 2022
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