Osmium-189m
Properties and data of the isotope 189mOs.
See also: list of Osmium isotopes.
General data
Name of the isotope:Osmium-189m; Os-189mSymbol:189mOs or 189m76OsMass number A:189 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:113Isotopic mass:188.95814(2) u (atomic weight of Osmium-189m)
Excitation energy: 30.82(2) keVNuclide mass:188.9164522 u (calculated nuclear mass without electrons)Mass excess:-38.99234 MeVMass defect:1.61569794 u (per nucleus)Nuclear binding energy:1505.01293692 MeV (per nucleus)
7.96303141 MeV (average binding energy per nucleon)Half-life:5.81(10) hDecay constant λ:3.313956686555 × 10-5 s-1Specific activity α:1.061548615434 × 10+17 Bq g-1
2869050.3119849 Ci g-1Spin and parity:
(nuclear angular momentum)9/2-
Radioactive Decay
Half-life T½ = 5.81(10) h (hours) respectively 2.0916 × 104 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
Iso | 189Os | 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 |
---|
189Os | | stable | 3/2- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 113) and isobaric (same nucleon number A = 189) with Osmium-189m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 113 | Isobar A = 189 |
70 | 183Yb | |
71 | 184Lu | |
72 | 185Hf | 189Hf |
73 | 186Ta | 189Ta |
74 | 187W | 189W |
75 | 188Re | 189Re |
76 | 189Os | 189Os |
77 | 190Ir | 189Ir |
78 | 191Pt | 189Pt |
79 | 192Au | 189Au |
80 | 193Hg | 189Hg |
81 | 194Tl | 189Tl |
82 | 195Pb | 189Pb |
83 | 196Bi | 189Bi |
84 | 197Po | 189Po |
85 | 198At | |
86 | 199Rn | |
87 | 200Fr | |
88 | 201Ra | |
Last update: 2020-10-21
Perma link: https://www.chemlin.org/isotope/osmium-189m
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