Uranium-236m2

Properties and data of the isotope ^236m2U.

Contents

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

General data

Name of the isotope:Uranium-236m2; U-236m2Symbol:^236m2U or 236m292UMass 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):52Excitation energy:2750(3) keVIsotopic mass:236.0455662(12) u (atomic weight of Uranium-236m2)Nuclide mass:235.9951035 u (calculated nuclear mass without electrons)Mass excess:42.44464 MeVMass defect:1.922084648 u (per nucleus)Nuclear binding energy:1790.4103171 MeV (per nucleus)
7.58648439 MeV (average binding energy per nucleon)Half-life:120(2) nsDecay constant λ:5776226.5046662 s^-1Specific activity α:1.473951256355 × 10⁺²⁸ Bq g^-1
3.983652044205 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)(0+)

Radioactive Decay

Half-life T_½ = 120(2) ns respectively 1.2 × 10^-7 seconds s.

Decay mode	Daughter	Probability
Iso	²³⁶U	87(6) %
SZ		13(6) %
α	²³²Th

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
²³⁶U		2.342(4) × 10⁷ a	0+
^236m1U	1052.89(19) keV	100(4) ns	(4)-

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-236m2. 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