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Uranium-227

Properties and data of the isotope 227U.

 

Uranium-227 is the very short-lived radioisotope of the element Uranium, whose atomic nucleus has 135 neutrons in addition to the element-specific 92 protons, resulting in a mass number of 227: 227U.

See also: list of Uranium isotopes.

 

General data

Name of the isotope:Uranium-227; U-227Symbol:227UMass number A:227Atomic number Z:92 (= number of protons)Neutrons N:135Isotopic mass:227.031182(10) u (atomic weight of Uranium-227)Nuclide mass:226.9807193 u (calculated nuclear mass without electrons)Mass excess:29.04585 MeVMass defect:1.858484604 u (per nucleus)Nuclear binding energy:1731.16725772 MeV (per nucleus)
7.62628748 MeV (average binding energy per nucleon)
Separation energy:SN = 6.355(16) MeV (first neutron)
SP = 4.277(15) MeV (first proton)
Half-life:1.1(1) minDecay constant λ:0.010502230008484 s-1Spin and parity:(3/2+)Year of discovery:1952

 

Radioactive Decay

Half-life T½ = 1.1(1) min (minutes) respectively 6.6 × 101 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
α223Th100 %7,235(3) MeV

 

Uranium-227 radioactive decay cascade

 

Parent Nuclides

Direct parent isotope is: 231Pu.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 135) and isobaric (same nucleon number A = 227) with Uranium-227. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 135Isobar A = 227
80215Hg
81216Tl
82217Pb
83218Bi
84219Po227Po
85220At227At
86221Rn227Rn
87222Fr227Fr
88223Ra227Ra
89224Ac227Ac
90225Th227Th
91226Pa227Pa
92227U227U
93228Np227Np
94229Pu
95230Am

 

External data and identifiers

Adopted Levels, Gammas:NuDat 227U

 


Category: Isotopes

Last update: 26.11.2022



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