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Iridium-186

Properties and data of the isotope 186Ir.


Contents

See also: list of Iridium isotopes.

 

General data

Name of the isotope:Iridium-186; Ir-186Symbol:186Ir or 18677IrMass number A:186 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:109Isotopic mass:185.957947(18) u (atomic weight of Iridium-186)Nuclide mass:185.9157108 u (calculated nuclear mass without electrons)Mass excess:-39.17212 MeVMass defect:1.589056308 u (per nucleus)Nuclear binding energy:1480.19641656 MeV (per nucleus)
7.95804525 MeV (average binding energy per nucleon)
Separation energy:SN = 6.91(3) MeV (first neutron)
SP = 3.655(17) MeV (first proton)
Half-life:16.64(3) hDecay constant λ:1.157096655582 × 10-5 s-1Specific activity α:3.766594080258 × 10+16 Bq g-1
1017998.4000698 Ci g-1
Spin and parity:
(nuclear angular momentum)
5+Magnetic dipole moment:μ(μN) = + 3.88(5)Quadrupole moment Q:- 2.55(3) barn (100 fm2)Nuclear g-factor:gl = 0.776Charge radius:5.3900(1061) femtometer fmYear of discovery:1958

 

Radioactive Decay

Half-life T½ = 16.64(3) h (hours) respectively 5.9904 × 104 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
EC/β+186Os100 %3.828(17) MeV

 

Parent Nuclides

Direct parent isotope is: 186Pt.

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
186mIr+x keV1.90(5) h2-

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 109) and isobaric (same nucleon number A = 186) with Iridium-186. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 109Isobar A = 186
68177Er
69178Tm
70179Yb
71180Lu186Lu
72181Hf186Hf
73182Ta186Ta
74183W186W
75184Re186Re
76185Os186Os
77186Ir186Ir
78187Pt186Pt
79188Au186Au
80189Hg186Hg
81190Tl186Tl
82191Pb186Pb
83192Bi186Bi
84193Po186Po
85194At
86195Rn

 

External data and identifiers

Adopted Levels, Gammas:NuDat 186Ir

 


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Last update: 2020-10-21


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