Silicon-22 is a radioisotope of the chemical element silicon, which has 8 neutrons in its atomic nucleus in addition to the element-specific 14 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 22. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of 22Si is exclusively for academic purposes and experimental research.
The radioactive nuclide was first observed and identified during the fragmentation of a nickel template by irradiation with argon-36 ions of an energy of 86 MeV/u [1].
See also: List of individual Silicon isotopes (and general data sources).
Half-life T½ = 28.7(11) ms respectively 2.87 × 10-2 seconds s.
| Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
|---|---|---|---|---|
| EC/β+ | 22Al | 37.3 % | 15.439(641) MeV | |
| β+, p | 21Mg | 62(5) % | ||
| β+, 2p | 20Na | 0.7(3) % |
| Z | Isotone N = 8 | Isobar A = 22 |
|---|---|---|
| 2 | 10He | |
| 3 | 11Li | |
| 4 | 12Be | |
| 5 | 13B | |
| 6 | 14C | 22C |
| 7 | 15N | 22N |
| 8 | 16O | 22O |
| 9 | 17F | 22F |
| 10 | 18Ne | 22Ne |
| 11 | 19Na | 22Na |
| 12 | 20Mg | 22Mg |
| 13 | 21Al | 22Al |
| 14 | 22Si | 22Si |
[1] - M. G. Saint-Laurent et al.:
Observation of a bound TZ=-3 nucleus: 22Si.
In: Physical Review, 59, 33, (1987), DOI 10.1103/PhysRevLett.59.33.
[2] - X.X. Xu et al.:
Observation of β-delayed two-proton emission in the decay of 22Si.
In: Physics Letters B, 766, (2017), DOI 10.1016/j.physletb.2017.01.028.
[3] - Y. M. Xing et al.:
Z = 14 Magicity Revealed by the Mass of the Proton Dripline Nucleus 22Si.
In: Physical Review Letters, 135, 012501, (2025), DOI 10.1103/ffwt-n7yc.
Last update: 2025-12-23
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