This year, several isotopes were newly discovered or characterized – and, as expected, these are very short-lived atomic nuclei of interest for research.
In January 2026, seven new, extremely neutron-rich isotopes were identified at the RIKEN RI Beam Factory via in-flight projectile fragmentation of a uranium-238 beam on a beryllium target. The discovery comprises the nuclides cesium-152, barium-155, lanthanum-158, cerium-159, cerium-160, gadolinium-173, and terbium-175, which were produced simultaneously and detected using the BigRIPS separator.
A report on the discovery of berkelium-235 and its alpha-decay product, americium-231, appeared in March. The discovery was made by irradiating a gold-197 foil with a beam of argon-40 ions.
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.
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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).
n-Hexane, Decamethyltetrasiloxane, Amphetamine, 3,4-Dihydroxyphenylacetaldehyde, 2-Phenylphenol, Diperoxochloric acid, 2,5-Cyclohexadiene-1-thione, 1,3-Dichloropropene
Last update: 10/06/2026
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