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Iridium-187

Properties and data of the isotope 187Ir.

Contents
General Data
Radioactive Decay
Parent Nuclides
Isotones und Isobares

See also: List of individual Iridium isotopes (and general data sources).

 

General data

Name of the isotope:Iridium-187; Ir-187Symbol:187Ir or 18777IrMass number A:187 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:110Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.4285714285714 (= neutron-proton ratio)Neutron excess (N-Z):33Isotopic mass:186.95754(3) u (atomic weight of Iridium-187)Nuclide mass:186.9153038 u (calculated nuclear mass without electrons)Mass excess:-39.55124 MeVMass defect:1.598128224 u (per nucleus)Nuclear binding energy:1488.64685189 MeV (per nucleus)
7.96067835 MeV (average binding energy per nucleon)Separation energy:SN = 8.45(3) MeV (first neutron)
SP = 3.838(28) MeV (first proton)Half-life:10.5(3) hDecay constant λ:1.83372269989 × 10-5 s-1Specific activity α:5.937062578938 × 10+16 Bq g-1
1604611.5078212 Ci g-1Spin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μN) = + 0.171(1)Quadrupole moment Q:+ 0.941(11) barn (100 fm2)Nuclear g-factor:gl = 0.114Charge radius:5.3812(1061) femtometer fmYear of discovery:1958

 

Radioactive Decay

Half-life T½ = 10.5(3) h (hours) respectively 3.7800 × 104 seconds s.

Decay
mode		DaughterProbabilityDecay energyγ energy
(intensity)
EC/β+187Os100 %1.670(28) MeV

 

Parent Nuclides

Direct parent isotope is: 187Pt.

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
187m1Ir186.16(4) keV30.3(6) ms9/2-
187m2Ir433.75(6) keV152(12) ns11/2-

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 110) and isobaric (same nucleon number A = 187) with Iridium-187. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 110Isobar A = 187
69179Tm
70180Yb
71181Lu187Lu
72182Hf187Hf
73183Ta187Ta
74184W187W
75185Re187Re
76186Os187Os
77187Ir187Ir
78188Pt187Pt
79189Au187Au
80190Hg187Hg
81191Tl187Tl
82192Pb187Pb
83193Bi187Bi
84194Po187Po
85195At
86196Rn

 

External data and identifiers

Adopted Levels, Gammas:NuDat 187Ir

 

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Last update: 2020-10-21

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