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Oxygen-25

Properties and data of the isotope 25O.


Contents

 

Oxygen-25 isotope

Oxygen-25 is a radioisotope of the chemical element oxygen, which has 17 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 25. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of 25O is exclusively for academic purposes.

The neutron-free ground state of oxygen-25 was first reported in 2008; the neutron-rich nuclide was produced by a 1-proton knockout reaction during irradiation of beryllium with fluorine-26 (85 MeV/u) [1].

See also: list of Oxygen isotopes.

 

General data

Name of the isotope:Oxygen-25; O-25Symbol:25O or 258OMass number A:25 (= number of nucleons)Atomic number Z:8 (= number of protons)Neutrons N:17Isotopic mass:25.02934(18) u (atomic weight of Oxygen-25)Nuclide mass:25.0249514 u (calculated nuclear mass without electrons)Mass excess:27.33003 MeVMass defect:0.180563828 u (per nucleus)Nuclear binding energy:168.1941224 MeV (per nucleus)
6.7277649 MeV (average binding energy per nucleon)
Separation energy:
SP = 26.898(433) MeV (first proton)
Half-life:5.18 zsDecay constant λ:1.338121970192 × 10+20 s-1Specific activity α:3.223343596911 × 10+42 Bq g-1
8.711739451111 × 10+31 Ci g-1
Spin and parity:
(nuclear angular momentum)
3/2+Year of discovery:2008

 

Radioactive Decay

Half-life T½ = 5.18 zs respectively 5.18 × 10-21 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
n24O100 %

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 17) and isobaric (same nucleon number A = 25) with Oxygen-25. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 17Isobar A = 25
724N25N
825O25O
926F25F
1027Ne25Ne
1128Na25Na
1229Mg25Mg
1330Al25Al
1431Si25Si
1532P25P
1633S
1734Cl
1835Ar
1936K
2037Ca
2138Sc
2239Ti
2340V
2441Cr
2542Mn

 

External data and identifiers

Adopted Levels, Gammas:NuDat 25O

 

Literature and References

[1] - C. R. Hoffman, T. Baumann, D. Bazin et al.:
Determination of the N=16 Shell Closure at the Oxygen Drip Line.
In: Physical Review Letters, 100, 152502, (2008), DOI 10.1103/PhysRevLett.100.152502.

[2] - C. Caesar et al.:
Beyond the neutron drip line: The unbound oxygen isotopes 25O and 26O.
In: Physical Review C, (2013), DOI 10.1103/PhysRevC.88.034313.

 


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Last update: 2024-10-10


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