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Oxygen-28

Properties and data of the isotope 28O.


Contents

 

Oxygen-28 isotope

Oxygen-28 is a radioisotope of the chemical element oxygen, which has 20 neutrons in its atomic nucleus in addition to the element-specific 8 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 28. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of 28O is exclusively for academic purposes.

The following data are preliminary and calculated based on theoretical considerations.

See also: list of Oxygen isotopes.

 

General data

Name of the isotope:Oxygen-28; O-28Symbol:28O or 288OMass number A:28 (= number of nucleons)Atomic number Z:8 (= number of protons)Neutrons N:20Isotopic mass:28.05591(75) u (atomic weight of Oxygen-28)Nuclide mass:28.0515214 u (calculated nuclear mass without electrons)Mass excess:52.07983 MeVMass defect:0.179988576 u (per nucleus)Nuclear binding energy:167.65827861 MeV (per nucleus)
5.98779566 MeV (average binding energy per nucleon)
Half-life:< 100 nsDecay constant λ:6931471.8055995 s-1Specific activity α:1.490796413571 × 10+29 Bq g-1
4.029179496138 × 10+18 Ci g-1
Spin and parity:
(nuclear angular momentum)
0+Year of discovery:2023

 

Radioactive Decay

Half-life T½ = < 100 ns respectively 1 × 10-7 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
2n26O?

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 20) and isobaric (same nucleon number A = 28) with Oxygen-28. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 20Isobar A = 28
828O28O
929F28F
1030Ne28Ne
1131Na28Na
1232Mg28Mg
1333Al28Al
1434Si28Si
1535P28P
1636S28S
1737Cl28Cl
1838Ar
1939K
2040Ca
2141Sc
2242Ti
2343V
2444Cr
2545Mn
2646Fe
2747Co
2848Ni

 

Literature and References

[1] - H. Sakurai et al.:
Evidence for particle stability of 31F and particle instability of 25N and 28O.
In: Physics Letters B, 448(3-4), (1999), DOI 10.1016/S0370-2693(99)00015-5.

[2] - Y. Kondo, N. L. Achouri, H. Al Falou et al.:
First observation of 28O.
In: Nature, (2023), DOI 10.1038/s41586-023-06352-6.

 


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Last update: 2024-10-10


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