This year, several isotopes were newly discovered or characterized – and, as expected, these are very short-lived atomic nuclei of interest for research.
The first report describes the observation of the superheavy nuclide rutherfordium-252 and its nuclear isomer Rf-252m. The neutron-poor isotope aluminum-20 was also discovered in the GSI facilities.
The newly discovered superheavy isotopes include livermorium-288, livermorium-289, and copernicium-280 (Oganessian et al.), as well as seaborgium-257 (Mosat et al.).
The identification of 13 new neutron-poor isotopes has been reported from Japan: lanthanum-118, lanthanum-119, cerium-119, cerium-120, praseodymium-122, praseodymium-123, neodymium-123, neodymium-124, neodymium-126, promethium-125, promethium-126, promethium-127, and samarium-128. The isotopes were generated by in-flight fragmentation of a uranium-238 beam with 345 MeV per nucleon on a 1 mm thick beryllium target and unambiguously identified using the BigRIPS separator by combined determination of mass and atomic number.
Other new discoveries: scandium-63, titanium-65, titanium-66 and vanadium-68 (Tarasov et al.) as well as astatine-188 (Kokkonen et al.), protactinium-210 (Zhang et al.) and tin-98 (Suzuki et al.).
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The half-life values of the following isotopes or nuclides have recently been re-determined and published in the specialist literature (incomplete list; old value in square brackets):
The atomic weight of the element lead was previously given as 207.2 ± 0.1 u. Now the IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW) recommends changing the standard atomic weight (i.e. relative atomic mass) to 207.2 ± 1,1 and the interval notation [206,14; 207.94]. The assignment of an interval for the new standard atomic weight of lead reflects the frequent occurrence of fluctuations in isotopic abundances in normal terrestrial Pb materials (source: IUPAC) .
Last update: 27/10/2025
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