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Uranium-229

Properties and data of the isotope 229U.

 

Uranium-229 is the short-lived radioisotope of the element uranium, whose atomic nucleus has 137 neutrons in addition to the element-specific 92 protons, resulting in a mass number of 229: 229U.

See also: list of Uranium isotopes.

 

General data

Name of the isotope:Uranium-229; U-229Symbol:229UMass number A:229Atomic number Z:92 (= number of protons)Neutrons N:137Isotopic mass:229.033506(6) u (atomic weight of Uranium-229)Nuclide mass:228.9830433 u (calculated nuclear mass without electrons)Mass excess:31.21064 MeVMass defect:1.873490436 u (per nucleus)Nuclear binding energy:1745.14510019 MeV (per nucleus)
7.62072096 MeV (average binding energy per nucleon)
Separation energy:SN = 6.083(15) MeV (first neutron)
SP = 5.002(7) MeV (first proton)
Half-life:58(3) minDecay constant λ:0.00019918022429883 s-1Spin and parity:(3/2+)Year of discovery:1949

 

Radioactive Decay

Half-life T½ = 58(3) min (minutes) respectively 3.480 × 103 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
α225Thca. 20 %6,476(3) MeV
EE229Paca. 80 %1,314(7) MeV

 

Uranium-229 radioactive decay cascade

 

Parent Nuclides

Direct parent isotope is: 233Pu.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 137) and isobaric (same nucleon number A = 229) with Uranium-229. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 137Isobar A = 229
82219Pb
83220Bi
84221Po
85222At229At
86223Rn229Rn
87224Fr229Fr
88225Ra229Ra
89226Ac229Ac
90227Th229Th
91228Pa229Pa
92229U229U
93230Np229Np
94231Pu229Pu
95232Am229Am
96233Cm
97234Bk

 

External data and identifiers

Adopted Levels, Gammas:NuDat 229U

 


Category: Isotopes

Last update: 26.11.2022



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