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| General | |
|---|---|
| Symbol | 209Bi |
| Names | bismuth-209, 209Bi, Bi-209 |
| Protons (Z) | 83 |
| Neutrons (N) | 126 |
| Nuclide data | |
| Natural abundance | 100% |
| Half-life (t1/2) | 2.01×1019 years[1] |
| Isotope mass | 208.9803986 Da |
| Spin | 9/2− |
| Excess energy | −18258.461±2.4 keV |
| Binding energy | 7847.987±1.7 keV |
| Parent isotopes | 209Pb (β−) 209Po (β+) 213At (α) |
| Decay products | 205Tl |
| Decay modes | |
| Decay mode | Decay energy (MeV) |
| Alpha emission | 3.1373 |
| Isotopes of bismuth Complete table of nuclides | |
Bismuth-209 (209Bi) is an isotope of bismuth, with the longest known half-life of any radioisotope that undergoes α-decay (alpha decay). It has 83 protons and a magic number[2] of 126 neutrons,[2] and an atomic mass of 208.9803987 amu (atomic mass units). Primordial bismuth consists entirely of this isotope.
- ^ Audi, G.; Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S. (2017). "The NUBASE2016 evaluation of nuclear properties" (PDF). Chinese Physics C. 41 (3): 030001. Bibcode:2017ChPhC..41c0001A. doi:10.1088/1674-1137/41/3/030001.
- ^ a b Blank, B.; Regan, P.H. (2000). "Magic and doubly-magic nuclei". Nuclear Physics News. 10 (4): 20–27. doi:10.1080/10506890109411553. S2CID 121966707.