Oxygen-13

Properties and data of the isotope ¹³O.

Content

General data

Name of the isotope:Oxygen-13; O-13Symbol:¹³O or 138OMass number A:13 (= number of nucleons)Atomic number Z:8 (= number of protons)Neutrons N:5Isotopic mass:13.024815(10) u (atomic weight of Oxygen-13)Nuclide mass:13.0204264 u (calculated nuclear mass without electrons)Mass excess:23.11502 MeVMass defect:0.081109836 u (per nucleus)Nuclear binding energy:75.55332557 MeV (per nucleus)
5.81179427 MeV (average binding energy per nucleon)Separation energy:S_N = 16.870(26) MeV (first neutron)
S_P = 5.8118(7) MeV (first proton)Half-life:8.58(5) msDecay constant λ:80.786384680646 s^-1Specific activity α:3.742361447014 × 10⁺²⁴ Bq g^-1
1.011449039733 × 10⁺¹⁴ Ci g^-1Spin and parity:
(nuclear angular momentum)(3/2-)Isobaric spin: 3/2Magnetic dipole moment:μ(μ_N) = 1.3892(3)Quadrupole moment Q:0.0111(8) barn (100 fm²)Nuclear g-factor:g_l = 0.92613333333333Mirror nucleus:Boron-13Year of discovery:1963

Radioactive Decay

Half-life T_½ = 8.58(5) ms respectively 8.58 × 10^-3 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	¹³N	89.1 %	17.767 MeV
β⁺, p	¹²C	10.9 %	-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 5) and isobaric (same nucleon number A = 13) with Oxygen-13. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.