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Osmium-189

Properties and data of the isotope 189Os.


Content

See also: list of Osmium isotopes.

 

General data

Name of the isotope:Osmium-189; Os-189Symbol:189Os or 18976OsMass 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-189)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)
Separation energy:SN = 5.9208(4) MeV (first neutron)
SP = 7.2589(5) MeV (first proton)
Half-life:stableSpin and parity:
(nuclear angular momentum)
3/2-Magnetic dipole moment:μ(μN) = + 0.659933(4)Charge radius:5..4016(11) femtometer fmYear of discovery:1931

 

Parent Nuclides

Direct parent isotopes are: 189Ir, 189Re.

 

Occurrence

Comparison of the natural Osmium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

 

Atomic Mass maQuantityHalf-lifeSpin
Osmium
Isotopic mixture
190.23 u100 %
Isotope 184Os183.952489(9) u0.02(1) %5.6 × 1013 a0+
Isotope 186Os185.95384(1) u1.59(3) %2.0(11) × 1015 a0+
Isotope 187Os186.95575(1) u1.96(2) %stable1/2-
Isotope 188Os187.95584(1) u13.24(8) %stable0+
Isotope 189Os188.95814(2) u16.15(5) %stable3/2-
Isotope 190Os189.95844(2) u26.26(2) %stable0+
Isotope 192Os191.96148(2) u40.78(19) %stable0+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 189Os

Isotope:189Os-NMRQuantity:16.15(5) %Spin:3/2-Nuclearmagnetic moment
μ/μN:
+ 0.659933(4)Nuclear g-factor:gl = 0.43995533333333Quadrupole moment Q:+ 0.856(28) barn (100 fm2)Resonance frequency:v0 = 3.3536 at 1 TRelative Sensitivity:0.00244 (H0 = const.)
0.3938 (v0 = const.)
[related to 1H = 1.000]

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
189mOs30.82(2) keV5.81(10) h9/2-

 

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-189. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

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

 

External data and identifiers

Adopted Levels, Gammas:NuDat 189Os

 


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Last update: 2020-10-21


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