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Oxygen-14

Properties and data of the isotope 14O.


Contents

 

Oxygen-14 isotope

Oxygen-14 is a radioisotope of the chemical element oxygen, which has 6 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 14. In the form of isotope beams, the radioactive isotope is of interest in the study of matter - particularly for the structural elucidation of proton-rich atomic nuclei; however, there is no practical technical application for 14O.

Oxygen-14 was first observed (1949) in experiments in which nitrogen gas was irradiated with 17 MeV protons in a cyclotron [1]:

14N(p,n)14O.

Other nuclear reactions in which O-14 is produced are now known; these include:

12C(3He,n)14O,

12C(α,2n)14O [2].

See also: list of Oxygen isotopes.

 

General data

Name of the isotope:Oxygen-14; O-14Symbol:14O or 148OMass number A:14 (= number of nucleons)Atomic number Z:8 (= number of protons)Neutrons N:6Isotopic mass:14.008596706(27) u (atomic weight of Oxygen-14)Nuclide mass:14.0042081 u (calculated nuclear mass without electrons)Mass excess:8.00778 MeVMass defect:0.105993046 u (per nucleus)Nuclear binding energy:98.73188639 MeV (per nucleus)
7.0522776 MeV (average binding energy per nucleon)
Separation energy:SN = 23.179(10) MeV (first neutron)
SP = 4.62667(27) MeV (first proton)
Half-life:70.621(11) sDecay constant λ:0.009815029248523 s-1Specific activity α:4.221963477071 × 10+20 Bq g-1
11410712100.194 Ci g-1
Spin and parity:
(nuclear angular momentum)
0+Isobaric spin: 1Mirror nucleus:Carbon-14Year of discovery:1949

 

Radioactive Decay

Half-life T½ = 70.621(11) s respectively 7.0621 × 101 seconds s.

Decay
mode
DaughterProbabilityDecay energyDetailsγ energy
(intensity)
EC,β+14N100 %5.144364(25) MeVβ+: 0.770(55) MeV
[99.249(10) %]
2m312593(11) MeV
[99.388(11) %]

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 6) and isobaric (same nucleon number A = 14) with Oxygen-14. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 6Isobar A = 14
17H
28He
39Li
410Be14Be
511B14B
612C14C
713N14N
814O14O
915F14F
1016Ne
1117Na
1218Mg

 

External data and identifiers

Adopted Levels, Gammas:NuDat 14O

 

Literature and References

[1] - R. Sherr, H. R. Muether, M. G. White:
Radioactivity of C10 and O14.
In: Physical Review, 75, 282, (1949), DOI 10.1103/PhysRev.75.282.

[2] - T. Nozaki, M. Iwamoto:
Yield of 14O for the Reactions 14N(p,n)14O, 12C(3He,n)14O and 12C(α,2n)14O.
In: Radiochimica Acta, 29, (1981), DOI 10.1524/ract.1981.29.23.57.

[3] - S. Giraud et al.:
β+ Gamow-Teller Strengths from Unstable 14O via the (d,2He) Reaction in Inverse Kinematics.
In: Physical Review Letters,130, 232301, (2023), DOI 10.1103/PhysRevLett.130.232301.

 


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Last update: 2024-10-03


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