Uranium-236

Properties and data of the isotope ²³⁶U.

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-236; U-236Other names:ThoruraniumSymbol:²³⁶U or 23692UMass number A:236 (= number of nucleons)Atomic number Z:92 (= number of protons)Neutrons N:144Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.5652173913043 (= neutron-proton ratio)Neutron excess (N-Z):52Isotopic mass:236.0455661(12) u (atomic weight of Uranium-236)Nuclide mass:235.9951034 u (calculated nuclear mass without electrons)Mass excess:42.44455 MeVMass defect:1.922084748 u (per nucleus)Nuclear binding energy:1790.41041025 MeV (per nucleus)
7.58648479 MeV (average binding energy per nucleon)Separation energy:S_N = 6.54552(26) MeV (first neutron)
S_P = 7.133(14) MeV (first proton)Half-life:2.342(4) × 10⁷ aDecay constant λ:9.38495000413 × 10^-16 s^-1Specific activity α:2394808.9359482 Bq g^-1
6.472456583643 × 10^-5 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.8431(38) femtometer fmYear of discovery:1951

Radioactive Decay

Half-life T_½ = 2.342(4) × 10⁷ a respectively 7.3857312 × 10¹⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²³²Th	ca. 100 %	4.5730(9) MeV
SZ	div	rare

Parent Nuclides

Direct parent isotopes are: ²⁴⁰Pu, ²³⁶Np, ²³⁶Pa.

Nuclear Isomers

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

Nuclear Isomer	Excitation Energy	Half-life	Spin
^236m1U	1052.89(19) keV	100(4) ns	(4)-
^236m2U	2750(3) keV	120(2) ns	(0+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 144) and isobaric (same nucleon number A = 236) with Uranium-236. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 144	Isobar A = 236
85	²²⁹At
86	²³⁰Rn
87	²³¹Fr
88	²³²Ra
89	²³³Ac	²³⁶Ac
90	²³⁴Th	²³⁶Th
91	²³⁵Pa	²³⁶Pa
92	²³⁶U	²³⁶U
93	²³⁷Np	²³⁶Np
94	²³⁸Pu	²³⁶Pu
95	²³⁹Am	²³⁶Am
96	²⁴⁰Cm	²³⁶Cm
97	²⁴¹Bk	²³⁶Bk
98	²⁴²Cf
99	²⁴³Es
100	²⁴⁴Fm
101	²⁴⁵Md