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Oxygen-22

Properties and data of the isotope 22O.


Contents

 

Oxygen-22 isotope

Oxygen-22 is a radioisotope of the chemical element oxygen, which has 14 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 22. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of 22O is exclusively for academic purposes.

According to a report from 1969, the first observation and identification of the unstable nuclide was achieved in an transfer reaction by irradiating metallic thorium-232 with oxygen-18 atoms accelerated to 122 MeV [1].

See also: list of Oxygen isotopes.

 

General data

Name of the isotope:Oxygen-22; O-22Symbol:22O or 228OMass number A:22 (= number of nucleons)Atomic number Z:8 (= number of protons)Neutrons N:14Isotopic mass:22.00997(6) u (atomic weight of Oxygen-22)Nuclide mass:22.0055814 u (calculated nuclear mass without electrons)Mass excess:9.287 MeVMass defect:0.17393908 u (per nucleus)Nuclear binding energy:162.02320939 MeV (per nucleus)
7.36469134 MeV (average binding energy per nucleon)
Separation energy:SN = 6.850(58) MeV (first neutron)
SP = 23.238(146) MeV (first proton)
Half-life:2.25(9) sDecay constant λ:0.3080654135822 s-1Specific activity α:8.432787793939 × 10+21 Bq g-1
227913183619.98 Ci g-1
Spin and parity:
(nuclear angular momentum)
0+Mirror nucleus:Silicon-22Year of discovery:1969

 

Radioactive Decay

Half-life T½ = 2.25(9) s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
β-22F> 78 %6.49(6) MeV
β-, n21F< 22 %1.259(57) MeV

 

Parent Nuclides

Direct parent isotopes are: 22N, 23N.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 14) and isobaric (same nucleon number A = 22) with Oxygen-22. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 14Isobar A = 22
519B
620C22C
721N22N
822O22O
923F22F
1024Ne22Ne
1125Na22Na
1226Mg22Mg
1327Al22Al
1428Si22Si
1529P
1630S
1731Cl
1832Ar
1933K
2034Ca

 

External data and identifiers

Adopted Levels, Gammas:NuDat 22O

 

Literature and References

[1] - A. G. Artukh, G. F. Gridnev, V. L. Mikheev, V.V. Volkov:
New isotopes 22O, 20N and 18C produced in transfer reactions with heavy ions.
In: Nuclear Physics A, 137, 2, (1969), DOI 10.1016/0375-9474(69)90114-6.

 


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Last update: 2024-10-09


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