Xenon-136m
Properties and data of the isotope 136Xe.
See also: list of Xenon isotopes.
General data
Name of the isotope:Xenon-136m; Xe-136mSymbol:136Xe or 13654XeMass number A:136 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:82Isotopic mass:135.90721448(7) u (atomic weight of Xenon-136m)
Excitation energy: 1891.74(7) keVNuclide mass:135.8775931 u (calculated nuclear mass without electrons)Mass excess:-86.42916 MeVMass defect:1.22586036 u (per nucleus)Nuclear binding energy:1141.88157018 MeV (per nucleus)
8.39618802 MeV (average binding energy per nucleon)Half-life:2.95(17) μsDecay constant λ:234965.14595252 s-1Specific activity α:1.048143115630 × 10+27 Bq g-1
2.832819231434 × 10+16 Ci g-1Spin and parity:
(nuclear angular momentum)6+
Radioactive Decay
Half-life T½ = 2.95(17) μs respectively 2.95 × 10-6 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
Iso | 136Xe | 100 % | | |
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 |
---|
136Xe | | 2.165(61) × 1021 a | 0+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 82) and isobaric (same nucleon number A = 136) with Xenon-136m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 82 | Isobar A = 136 |
45 | 127Rh | |
46 | 128Pd | |
47 | 129Ag | |
48 | 130Cd | |
49 | 131In | 136In |
50 | 132Sn | 136Sn |
51 | 133Sb | 136Sb |
52 | 134Te | 136Te |
53 | 135I | 136I |
54 | 136Xe | 136Xe |
55 | 137Cs | 136Cs |
56 | 138Ba | 136Ba |
57 | 139La | 136La |
58 | 140Ce | 136Ce |
59 | 141Pr | 136Pr |
60 | 142Nd | 136Nd |
61 | 143Pm | 136Pm |
62 | 144Sm | 136Sm |
63 | 145Eu | 136Eu |
64 | 146Gd | 136Gd |
65 | 147Tb | 136Tb |
66 | 148Dy | |
67 | 149Ho | |
68 | 150Er | |
69 | 151Tm | |
70 | 152Yb | |
71 | 153Lu | |
72 | 154Hf | |
73 | 155Ta | |
External data and identifiers
Last update: 2020-10-18
Perma link: https://www.chemlin.org/isotope/xenon-136m
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