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Sodium-21 is a radioisotope of the chemical element sodium, which, in addition to the element-specific 11 protons, has 10 neutrons in the atomic nucleus, resulting in the mass number 21. The very short-lived, unstable and therefore radioactive nuclide, which can only be produced artificially, has no practical significance; The study of 21Na serves exclusively academic purposes.
See also: list of Sodium isotopes.
The half-life of the nuclide 21Na was redetermined in 2018 and used here. It replaces the previous value of T1/2 = 22.49(4); In contrast, the new value is increased by 0.0049 s and the uncertainty is reduced by a factor of 1.5 [1].
Half-life T½ = 22.4615(39) s respectively 2.24615 × 101 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|---|---|---|---|
β+ | 21Ne | 100 % | 3.54692(6) MeV |
Direct parent isotopes are: 21Mg, 22Al, 23Si.
OZ | Isotone N = 10 | Isobar A = 21 |
---|---|---|
3 | 13Li | |
4 | 14Be | |
5 | 15B | 21B |
6 | 16C | 21C |
7 | 17N | 21N |
8 | 18O | 21O |
9 | 19F | 21F |
10 | 20Ne | 21Ne |
11 | 21Na | 21Na |
12 | 22Mg | 21Mg |
13 | 23Al | 21Al |
14 | 24Si | |
15 | 25P | |
16 | 26S |
[1] - P. D. Shidling, R. S. Behling, B. Fenker et al.:
High-precision half-life measurement of the β+ decay of 21Na.
In: Physical Review C, 98, 015502, (2018), DOI 10.1103/PhysRevC.98.015502.
[2] - R. Bijker, F. Iachello:
Cluster structure of 21Ne and 21Na.
In: Nuclear Physics A, 1010, 122193, (2021), DOI 10.1016/j.nuclphysa.2021.122193.
Last update: 2023-11-03
Perma link: https://www.chemlin.org/isotope/sodium-21
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