翻訳と辞書
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・ Isotope lists, 0-24
・ Isotope lists, 25-48
・ Isotope lists, 49-72
・ Isotope lists, 73-96
・ Isotope lists, 97+
・ Isotope separation
・ Isotope-coded affinity tag
・ Isotope-ratio mass spectrometry
・ Isotopes of actinium
・ Isotopes of aluminium
・ Isotopes of americium
・ Isotopes of antimony
・ Isotopes of argon
・ Isotopes of arsenic
・ Isotopes of astatine
Isotopes of barium
・ Isotopes of berkelium
・ Isotopes of beryllium
・ Isotopes of bismuth
・ Isotopes of bohrium
・ Isotopes of boron
・ Isotopes of bromine
・ Isotopes of cadmium
・ Isotopes of caesium
・ Isotopes of calcium
・ Isotopes of californium
・ Isotopes of carbon
・ Isotopes of cerium
・ Isotopes of chlorine
・ Isotopes of chromium


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Isotopes of barium : ウィキペディア英語版
Isotopes of barium
Naturally occurring barium (Ba) is a mix of six stable isotopes and one very long-lived radioactive primordial isotope, barium-130, recently identified as being unstable by geochemical means (from analysis of the presence of its daughter xenon-130 in rocks). This nuclide decays by double-electron capture (absorbing two electrons and emitting two neutrinos) with a half-life of (0.5–2.7)×1021 years (about 1011 times the age of the universe).
There are a total of thirty-three known radioisotopes in addition to 130Ba, but most of these are highly radioactive with half-lives in the several millisecond to several minute range. The only notable exceptions are 133Ba, which has a half-life of 10.51 years, 131Ba (11.5 days), and 137mBa (2.55 minutes), which is the decay product of 137Cs (30.17 years, and a common fission product).
Barium-114 is predicted to undergo cluster decay, emitting a nucleus of stable 12C to produce 102Sn. However this decay is not yet observed; the upper limit on the branching ratio of such decay is 0.0034%.
Standard atomic mass: 137.327(7) u.
== Table ==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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