Uranium-223

Properties and data of the isotope ²²³U.

Contents

See also: List of individual Uranium isotopes (and general data sources).

General data

Name of the isotope:Uranium-223; U-223Symbol:²²³U or 22392UMass number A:223 (= number of nucleons)Atomic number Z:92 (= number of protons)Neutrons N:131Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.4239130434783 (= neutron-proton ratio)Neutron excess (N-Z):39Isotopic mass:223.02774(8) u (atomic weight of Uranium-223)Nuclide mass:222.9772773 u (calculated nuclear mass without electrons)Mass excess:25.83964 MeVMass defect:1.82726694 u (per nucleus)Nuclear binding energy:1702.08819101 MeV (per nucleus)
7.63268247 MeV (average binding energy per nucleon)Separation energy:S_N = 6.51(9) MeV (first neutron)
S_P = 3.61(10) MeV (first proton)Half-life:ca. 18 μsDecay constant λ:38508.176697775 s^-1Specific activity α:1.039917777279 × 10⁺²⁶ Bq g^-1
2.810588587241 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1991

Radioactive Decay

Half-life T_½ = ca. 18 μs respectively 1.8 × 10^-5 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²¹⁹Th	ca. 100 %	8.94(5) MeV
EC/β⁺	²²³Pa	ca. 0.2 %	3.52(10) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 131) and isobaric (same nucleon number A = 223) with Uranium-223. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 131	Isobar A = 223
79	²¹⁰Au
80	²¹¹Hg
81	²¹²Tl
82	²¹³Pb
83	²¹⁴Bi	²²³Bi
84	²¹⁵Po	²²³Po
85	²¹⁶At	²²³At
86	²¹⁷Rn	²²³Rn
87	²¹⁸Fr	²²³Fr
88	²¹⁹Ra	²²³Ra
89	²²⁰Ac	²²³Ac
90	²²¹Th	²²³Th
91	²²²Pa	²²³Pa
92	²²³U	²²³U
93	²²⁴Np	²²³Np