![]() ![]() "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". ^ Prohaska, Thomas Irrgeher, Johanna Benefield, Jacqueline et al."The NUBASE2020 evaluation of nuclear properties" (PDF). ^ a b c d e Theoretically capable of spontaneous fission.^ Believed to undergo β +β + decay to 132Xe with a half-life over 300×10 18 years.^ Cluster decay is predicted but had never been observed.^ # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).^ ( ) spin value – Indicates spin with weak assignment arguments.^ Bold symbol as daughter – Daughter product is stable.^ Bold italics symbol as daughter – Daughter product is nearly stable. ![]() ^ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).^ ( ) – Uncertainty (1 σ) is given in concise form in parentheses after the corresponding last digits.However this decay is not yet observed the upper limit on the branching ratio of such decay is 0.0034%. The shorter-lived 137mBa (half-life 2.55 minutes) arises as the decay product of the common fission product caesium-137.īarium-114 is predicted to undergo cluster decay, emitting a nucleus of stable 12C to produce 102Sn. The longest-lived isomer is 133mBa, which has a half-life of 38.9 hours. All other radioisotopes have half-lives shorter than two weeks. The longest-lived of these is 133Ba, which has a half-life of 10.51 years. There are a total of thirty-three known radioisotopes in addition to 130Ba. This nuclide decays by double electron capture (absorbing two electrons and emitting two neutrinos), with a half-life of (0.5–2.7)×10 21 years (about 10 11 times the age of the universe). Naturally occurring barium ( 56Ba) is a mix of six stable isotopes and one very long-lived radioactive primordial isotope, barium-130, identified as being unstable by geochemical means (from analysis of the presence of its daughter xenon-130 in rocks) in 2001. ![]()
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