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Rhenium-187

Properties and data of the isotope 187Re.


Content

See also: list of Rhenium isotopes.

 

General data

Name of the isotope:Rhenium-187; Re-187Symbol:187Re or 18775ReMass number A:187 (= number of nucleons)Atomic number Z:75 (= number of protons)Neutrons N:112Isotopic mass:186.95575(1) u (atomic weight of Rhenium-187)Nuclide mass:186.9146107 u (calculated nuclear mass without electrons)Mass excess:-41.21861 MeVMass defect:1.601597992 u (per nucleus)Nuclear binding energy:1491.87891996 MeV (per nucleus)
7.97796214 MeV (average binding energy per nucleon)
Separation energy:SN = 7.3605(9) MeV (first neutron)
SP = 5.9969(11) MeV (first proton)
Half-life:4.33(7) × 1010 aDecay constant λ:5.076109217018 × 10-19 s-1Specific activity α:1643.4970282423 Bq g-1
4.441883860114 × 10-8 Ci g-1
Spin and parity:
(nuclear angular momentum)
5/2+Magnetic dipole moment:μ(μN) = + 3.2197(3)Charge radius:5.3698(173) femtometer fmYear of discovery:1931

 

Radioactive Decay

Half-life T½ = 4.33(7) × 1010 a respectively 1.3655088 × 1018 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-187Os> 99.999 %2.467(2) MeV
α183Ta< 0.0001 %1.6521(17) MeV

 

Parent Nuclides

Direct parent isotope is: 187W.

 

Occurrence

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

 

Atomic Mass maQuantityHalf-lifeSpin
Rhenium
Isotopic mixture
186.207 u100 %
Isotope 185Re184.952955(8) u37.40(5) %stable5/2+
Isotope 187Re186.95575(1) u62.60(5) %4.33(7) × 1010 a5/2+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 187Re

Isotope:187Re-NMRQuantity:62.60(5) %Spin:5/2+Nuclearmagnetic moment
μ/μN:
+ 3.2197(3)Gyromagnetic ratio γ:6.1682 · 107 rad T-1 s-1Nuclear g-factor:gl = 1.28788Quadrupole moment Q:+ 2.07(2) barn (100 fm2)Resonance frequency:v0 = 9.8170 at 1 TRelative Sensitivity:0.14300 (H0 = const.)
2.6900 (v0 = const.)
[related to 1H = 1.000]

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 112) and isobaric (same nucleon number A = 187) with Rhenium-187. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 112Isobar A = 187
70182Yb
71183Lu187Lu
72184Hf187Hf
73185Ta187Ta
74186W187W
75187Re187Re
76188Os187Os
77189Ir187Ir
78190Pt187Pt
79191Au187Au
80192Hg187Hg
81193Tl187Tl
82194Pb187Pb
83195Bi187Bi
84196Po187Po
85197At
86198Rn
87199Fr

 

External data and identifiers

Adopted Levels, Gammas:NuDat 187Re

 


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Last update: 2023-05-18


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