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Oxygen-27

Properties and data of the isotope 27O.


Contents

 

Oxygen-27 isotope

Oxygen-27 is a radioisotope of the chemical element oxygen, which has 19 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 27. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of 27O 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-27; O-27Symbol:27O or 278OMass number A:27 (= number of nucleons)Atomic number Z:8 (= number of protons)Neutrons N:19Isotopic mass:27.04796(54) u (atomic weight of Oxygen-27)Nuclide mass:27.0435714 u (calculated nuclear mass without electrons)Mass excess:44.67445 MeVMass defect:0.17927366 u (per nucleus)Nuclear binding energy:166.99233865 MeV (per nucleus)
6.18490143 MeV (average binding energy per nucleon)
Half-life:< 260 nsDecay constant λ:2665950.6944613 s-1Specific activity α:5.946196521367 × 10+28 Bq g-1
1.607080140910 × 10+18 Ci g-1
Spin and parity:
(nuclear angular momentum)
3/2+Year of discovery:2023

 

Radioactive Decay

Half-life T½ = < 260 ns respectively 2.6 × 10-7 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
3n24O

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 19) and isobaric (same nucleon number A = 27) with Oxygen-27. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 19Isobar A = 27
827O27O
928F27F
1029Ne27Ne
1130Na27Na
1231Mg27Mg
1332Al27Al
1433Si27Si
1534P27P
1635S27S
1736Cl
1837Ar
1938K
2039Ca
2140Sc
2241Ti
2342V
2443Cr
2544Mn
2645Fe
2746Co

 

Literature and References

[1] - 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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