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Uranium-235

Properties and data of the isotope 235U.


Content

See also: list of Uranium isotopes.

 

General data

Name of the isotope:Uranium-235; U-235Other names:Actinuran. Actinouran. ActinouraniumSymbol:235U or 23592UMass number A:235 (= number of nucleons)Atomic number Z:92 (= number of protons)Neutrons N:143Isotopic mass:235.04393(2) u (atomic weight of Uranium-235)Nuclide mass:234.9934673 u (calculated nuclear mass without electrons)Mass excess:40.92053 MeVMass defect:1.915055932 u (per nucleus)Nuclear binding energy:1783.86311032 MeV (per nucleus)
7.59090685 MeV (average binding energy per nucleon)
Separation energy:SN = 5.29750(23) MeV (first neutron)
SP = 6.709(4) MeV (first proton)
Half-life:7.04(1) × 108 aDecay constant λ:3.122095583762 × 10-17 s-1Specific activity α:80007.231419595 Bq g-1
2.16235760593 × 10-6 Ci g-1
Spin and parity:
(nuclear angular momentum)
7/2-Magnetic dipole moment:μ(μN) = - 0.38(3)Charge radius:5.8337(41) femtometer fmYear of discovery:1935

 

Radioactive Decay

Half-life T½ = 7.04(1) × 108 a respectively 2.2201344 × 1016 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
α231Thca. 100 %4.6780(7) MeV
SZdivtrace

 

Parent Nuclides

Direct parent isotopes are: 239Pu, 235Np, 235Pa.

 

Occurrence

Comparison of the natural Uranium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

 

Atomic Mass maQuantityHalf-lifeSpin
Uranium
Isotopic mixture
238.02891 u100 %
Isotope 234U234.04095(2) u0.0054(5) %2.455(6) × 105 a0+
Isotope 235U235.04393(2) u0.7204(6) %7.04(1) × 108 a7/2-
Isotope 238U238.05079(2) u99.2742(10) %4.468(6) × 109 a0+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 235U

Isotope:235U-NMRQuantity:0.7204(6) %Spin:7/2-Nuclearmagnetic moment
μ/μN:
- 0.38(3)Gyromagnetic ratio γ:0.4926 · 107 rad T-1 s-1Nuclear g-factor:gl = -0.10857142857143Quadrupole moment Q:+ 4.936(6) barn (100 fm2)Resonance frequency:v0 = 0.83 at 1 TRelative Sensitivity:0.00015 (H0 = const.)
0.4082 (v0 = const.)
[related to 1H = 1.000]

 

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear IsomerExcitation EnergyHalf-lifeSpin
235mU0.0760(4) keVca. 26 min1/2+
235m2U2500(300) keV3.6(19) ms

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 143) and isobaric (same nucleon number A = 235) with Uranium-235. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 143Isobar A = 235
84227Po
85228At
86229Rn
87230Fr
88231Ra
89232Ac235Ac
90233Th235Th
91234Pa235Pa
92235U235U
93236Np235Np
94237Pu235Pu
95238Am235Am
96239Cm235Cm
97240Bk235Bk
98241Cf
99242Es
100243Fm
101244Md

 

External data and identifiers

CAS:15117-96-1InChI Key:JFALSRSLKYAFGM-OIOBTWANSA-NSMILES:[235U]PubChem:ID 61784Adopted Levels, Gammas:NuDat 235U

 


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Last update: 2021-03-15


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