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Oxygen-23

Properties and data of the isotope 23O.


Contents

 

Oxygen-23 isotope

Oxygen-23 is a radioisotope of the chemical element oxygen, which has 15 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 23. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of 23O is exclusively for academic purposes.

The radioactive nuclide was discovered by irradiating thorium-232 with neon-22 ions accelerated to 174 MeV [1].

See also: list of Oxygen isotopes.

 

General data

Name of the isotope:Oxygen-23; O-23Symbol:23O or 238OMass number A:23 (= number of nucleons)Atomic number Z:8 (= number of protons)Neutrons N:15Isotopic mass:23.01570(13) u (atomic weight of Oxygen-23)Nuclide mass:23.0113114 u (calculated nuclear mass without electrons)Mass excess:14.62446 MeVMass defect:0.176873996 u (per nucleus)Nuclear binding energy:164.75706603 MeV (per nucleus)
7.1633507 MeV (average binding energy per nucleon)
Separation energy:SN = 2.733(134) MeV (first neutron)
SP = 24.432(241) MeV (first proton)
Half-life:0.097(8) sDecay constant λ:7.1458472222675 s-1Specific activity α:1.871012979829 × 10+23 Bq g-1
5056791837377.6 Ci g-1
Spin and parity:
(nuclear angular momentum)
1/2+Year of discovery:1970

 

Radioactive Decay

Half-life T½ = 0.097(8) s respectively 9.7 × 10-2 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
β-23F93(2) %11.340(130) MeV
β-, n22F7(2) %3.757(122) MeV

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 15) and isobaric (same nucleon number A = 23) with Oxygen-23. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 15Isobar A = 23
520B
621C
722N23N
823O23O
924F23F
1025Ne23Ne
1126Na23Na
1227Mg23Mg
1328Al23Al
1429Si23Si
1530P
1631S
1732Cl
1833Ar
1934K
2035Ca
2136Sc

 

External data and identifiers

Adopted Levels, Gammas:NuDat 23O

 

Literature and References

[1] - A. G. Artukh et al.:
New isotopes 21N, 23O, 24O and 25F, produced in nuclear reactions with heavy ions.
In: Physics Letters B, 32(1), (1970), DOI 10.1016/0370-2693(70)90332-1.

 


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Last update: 2024-10-10


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