Atomic mass measurements of short-lived nuclides around the doubly-magic 208Pb

TL;DR

This paper reports precise atomic mass measurements of various short-lived nuclides around 208Pb using Penning trap mass spectrometry, enhancing nuclear structure understanding and data accuracy.

Contribution

The study provides new high-precision mass measurements of numerous nuclides near 208Pb, improving data quality for nuclear physics research and mass surface mapping.

Findings

Mass uncertainties between 2×10^{-7} and 2×10^{-8}

Enhanced identification of isomeric states

Improved atomic mass evaluation data

Abstract

Accurate atomic mass measurements of neutron-deficient and neutron-rich nuclides around the doubly-magic 208Pb and of neutron-rich cesium isotopes were performed with the Penning trap mass spectrometer ISOLTRAP at ISOLDE/CERN. The masses of 145,147Cs, 181,183Tl, 186Tlm, 187Tl, 196Tlm, 205Tl, 197Pbm, 208Pb, 190 to 197Bi, 209,215,216Bi, 203,205,229Fr, and 214,229,230Ra were determined. The obtained relative mass uncertainty in the range of $2 \cdot 10^{-7}$ to $2 \cdot 10^{-8}$ is not only required for safe identification of isomeric states but also allows mapping the detailed structure of the mass surface. A mass adjustment procedure was carried out and the results included into the Atomic Mass Evaluation. The resulting separation energies are discussed and the mass spectrometric and laser spectroscopic data are examined for possible correlations.