Oxygen-23

Properties and data of the isotope ²³O.

Content

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:S_N = 2.73(13) MeV (first neutron)
S_P = 24.43(24) MeV (first proton)Half-life:82 msDecay constant λ:8.4530143970725 s^-1Specific activity α:2.213271451749 × 10⁺²³ Bq g^-1
5981814734458.6 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2+Year of discovery:1970

Radioactive Decay

Half-life T_½ = 82 ms respectively 8.2 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²³F	68.3 %	11.311 MeV
β^-, n	²²F	31.7 %	3.7560 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.

OZ	Isotone N = 15	Isobar A = 23
5	²⁰B
6	²¹C
7	²²N	²³N
8	²³O	²³O
9	²⁴F	²³F
10	²⁵Ne	²³Ne
11	²⁶Na	²³Na
12	²⁷Mg	²³Mg
13	²⁸Al	²³Al
14	²⁹Si	²³Si
15	³⁰P
16	³¹S
17	³²Cl
18	³³Ar
19	³⁴K
20	³⁵Ca
21	³⁶Sc