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Osmium-189m

Properties and data of the isotope 189mOs.


Contents

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) keV
Nuclide 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-1
Spin 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
DaughterProbabilityDecay energyγ energy
(intensity)
Iso189Os100 %

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
189Osstable3/2-

 

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.

 

ZIsotone N = 113Isobar A = 189
70183Yb
71184Lu
72185Hf189Hf
73186Ta189Ta
74187W189W
75188Re189Re
76189Os189Os
77190Ir189Ir
78191Pt189Pt
79192Au189Au
80193Hg189Hg
81194Tl189Tl
82195Pb189Pb
83196Bi189Bi
84197Po189Po
85198At
86199Rn
87200Fr
88201Ra

 


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Last update: 2020-10-21


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