Sodium-19
Properties and data of the isotope 19Na.
Sodium-19 is a radioisotope of the chemical element sodium, which, in addition to the element-specific 11 protons, has 8 neutrons in the atomic nucleus, resulting in the mass number 19. The very short-lived, unstable and therefore radioactive nuclide, which can only be produced artificially, has no practical significance; The study of 19Na serves exclusively academic purposes.
See also: list of Sodium isotopes.
General data
Name of the isotope:Sodium-19; Na-19Symbol:19Na or 1911NaMass number A:19 (= number of nucleons)Atomic number Z:11 (= number of protons)Neutrons N:8Isotopic mass:19.013880(11) u (atomic weight of Sodium-19)Nuclide mass:19.0078457 u (calculated nuclear mass without electrons)Mass excess:12.92914 MeVMass defect:0.14151468 u (per nucleus)Nuclear binding energy:131.82007533 MeV (per nucleus)
6.9378987 MeV (average binding energy per nucleon)Separation energy:SN = 20.180(94) MeV (first neutron)Half-life:11.4 zsDecay constant λ:6.080238425964 × 10+19 s-1Specific activity α:1.927160645429 × 10+42 Bq g-1
5.208542284944 × 10+31 Ci g-1Spin and parity:
(nuclear angular momentum)(5/2+)Mirror nucleus:Oxygen-19Year of discovery:1969
Radioactive Decay
Half-life T½ = 11.4 zs respectively 1.14 × 10-20 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
p | 18Ne | ? 100 % | 0.832 MeV | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 8) and isobaric (same nucleon number A = 19) with Sodium-19. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 8 | Isobar A = 19 |
2 | 10He | |
3 | 11Li | |
4 | 12Be | |
5 | 13B | 19B |
6 | 14C | 19C |
7 | 15N | 19N |
8 | 16O | 19O |
9 | 17F | 19F |
10 | 18Ne | 19Ne |
11 | 19Na | 19Na |
12 | 20Mg | 19Mg |
13 | 21Al | |
14 | 22Si | |
External data and identifiers
Literature and References
[1] - M. G. Pellegriti et al.:
Evidence for core excitation in single-particle states of 19Na.
In: Physics Letters B, 659, 5, 864-869, (2008), DOI 10.1016/j.physletb.2007.12.017.
Last update: 2023-11-02
Perma link: https://www.chemlin.org/isotope/sodium-19
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