Uranium-226

Properties and data of the isotope ²²⁶U.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Uranium-226; U-226Symbol:²²⁶U or 22692UMass number A:226 (= number of nucleons)Atomic number Z:92 (= number of protons)Neutrons N:134Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4565217391304 (= neutron-proton ratio)Neutron excess (N-Z):42Isotopic mass:226.029339(14) u (atomic weight of Uranium-226)Nuclide mass:225.9788763 u (calculated nuclear mass without electrons)Mass excess:27.3291 MeVMass defect:1.851662688 u (per nucleus)Nuclear binding energy:1724.8126839 MeV (per nucleus)
7.63191453 MeV (average binding energy per nucleon)Separation energy:S_N = 8.122(17) MeV (first neutron)
S_P = 4.30(7) MeV (first proton)Half-life:268(9) msDecay constant λ:2.5863700767162 s^-1Specific activity α:6.891807485801 × 10⁺²¹ Bq g^-1
186265067183.81 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1973

Radioactive Decay

Half-life T_½ = 268(9) ms respectively 2.68 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²²²Th	100 %	7.701(4) MeV

Parent Nuclides

Direct parent isotope is: ²³⁰Pu.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 134) and isobaric (same nucleon number A = 226) with Uranium-226. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 134	Isobar A = 226
80	²¹⁴Hg
81	²¹⁵Tl
82	²¹⁶Pb
83	²¹⁷Bi
84	²¹⁸Po	²²⁶Po
85	²¹⁹At	²²⁶At
86	²²⁰Rn	²²⁶Rn
87	²²¹Fr	²²⁶Fr
88	²²²Ra	²²⁶Ra
89	²²³Ac	²²⁶Ac
90	²²⁴Th	²²⁶Th
91	²²⁵Pa	²²⁶Pa
92	²²⁶U	²²⁶U
93	²²⁷Np	²²⁶Np
94	²²⁸Pu
95	²²⁹Am