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Rubidium-87

Properties and data of the isotope 87Rb.


Content

See also: list of Rubidium isotopes.

 

General data

Name of the isotope:Rubidium-87; Rb-87Symbol:87Rb or 8737RbMass number A:87 (= number of nucleons)Atomic number Z:37 (= number of protons)Neutrons N:50Isotopic mass:86.909180531(6) u (atomic weight of Rubidium-87)Nuclide mass:86.8888839 u (calculated nuclear mass without electrons)Mass excess:-84.59779 MeVMass defect:0.81359145299999 u (per nucleus)Nuclear binding energy:757.85555692 MeV (per nucleus)
8.71098341 MeV (average binding energy per nucleon)
Separation energy:SN = 9.92211(20) MeV (first neutron)
SP = 8.62110(1) MeV (first proton)
Half-life:4.97(3) × 1010 aDecay constant λ:4.422445253458 × 10-19 s-1Specific activity α:3096.8125885681 Bq g-1
8.369763752886 × 10-8 Ci g-1
Spin and parity:
(nuclear angular momentum)
3/2-Magnetic dipole moment:μ(μN) = + 2.75129(8)Charge radius:4.1989(21) femtometer fmYear of discovery:1921

 

Radioactive Decay

Half-life T½ = 4.97(3) × 1010 a respectively 1.5673392 × 1018 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-87Sr100 %0.282275(6) MeV

 

Parent Nuclides

Direct parent isotopes are: 87Kr, 87Sr.

 

Occurrence

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

 

Atomic Mass maQuantityHalf-lifeSpin
Rubidium
Isotopic mixture
85.4678 u100 %
Isotope 85Rb84.91178974(3) u72.17(2) %stable5/2-
Isotope 87Rb86.909180531(6) u27.83(2) %4.97(3) × 1010 a3/2-

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 87Rb

Isotope:87Rb-NMRQuantity:27.83(2) %Spin:3/2-Nuclearmagnetic moment
μ/μN:
+ 2.75129(8)Gyromagnetic ratio γ:8.7851 · 107 rad T-1 s-1Nuclear g-factor:gl = 1.8341933333333Quadrupole moment Q:+ 0.1335(5) barn (100 fm2)Resonance frequency:v0 = 13.9814 at 1 TRelative Sensitivity:0.17704 (H0 = const.)
1.6419 (v0 = const.)
[related to 1H = 1.000]

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 50) and isobaric (same nucleon number A = 87) with Rubidium-87. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 50Isobar A = 87
2878Ni
2979Cu
3080Zn
3181Ga87Ga
3282Ge87Ge
3383As87As
3484Se87Se
3585Br87Br
3686Kr87Kr
3787Rb87Rb
3888Sr87Sr
3989Y87Y
4090Zr87Zr
4191Nb87Nb
4292Mo87Mo
4393Tc87Tc
4494Ru87Ru
4595Rh
4696Pd
4797Ag
4898Cd
4999In
50100Sn

 

External data and identifiers

Adopted Levels, Gammas:NuDat 87Rb

 


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Last update: 2020-10-14


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