Oxygen-15

Properties and data of the isotope ¹⁵O.

Content

General data

Name of the isotope:Oxygen-15; O-15Symbol:¹⁵O or 158OMass number A:15 (= number of nucleons)Atomic number Z:8 (= number of protons)Neutrons N:7Isotopic mass:15.0030656(5) u (atomic weight of Oxygen-15)Nuclide mass:14.998677 u (calculated nuclear mass without electrons)Mass excess:2.85559 MeVMass defect:0.120189068 u (per nucleus)Nuclear binding energy:111.95539571 MeV (per nucleus)
7.46369305 MeV (average binding energy per nucleon)Separation energy:S_N = 13.2235(5) MeV (first neutron)
S_P = 7.2968(5) MeV (first proton)Half-life:122.24(16) sDecay constant λ:0.00567037942212 s^-1Specific activity α:2.276521573952 × 10⁺²⁰ Bq g^-1
6152761010.6835 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2-Isobaric spin: 1/2Magnetic dipole moment:μ(μ_N) = 0.71908(12)Nuclear g-factor:g_l = 1.43816Mirror nucleus:Nitrogen-15Year of discovery:1934

Radioactive Decay

Half-life T_½ = 122.24(16) s respectively 1.2224 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	¹⁵N		2.7542(5) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 7) and isobaric (same nucleon number A = 15) with Oxygen-15. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.