New Isotopes 2024

Also this year, some isotopes were newly discovered or characterized - and as was to be expected, these are very short-lived atomic nuclei used for research.

Probably the most interesting report comes from the working group around Yu. Ts. Oganessian himself, referring to the generation and detection of Darmstadtium-275. this synthesis was achieved by the reaction ²³²Th(⁴⁸Ca,5n)²⁷⁵Ds.

Already at the end of last year, the artificial production of osmium-160 and its alpha decay product tungsten-156 was reported.

Other new discoveries: Actinium-203, Fluorine-30.

Newly determined half-lives

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):

• Germanium-71: 11.468(8) days [11.43(3) d],
• Iridium-190: 11.7511(20) days [11.78(10) d],
• Samarium-146: 9.20(26) × 10⁷ years [103(4) × 10⁷ a],
• Terbium-161: 6.934(14) days [6.89(2) d].

Standard atomic weight of lead has been changed

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: 27/08/2024

Perma link: https://www.chemlin.org

© 1996 - 2024 ChemLin