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Rubidium-85

Properties and data of the isotope 85Rb.


Content

See also: list of Rubidium isotopes.

 

General data

Name of the isotope:Rubidium-85; Rb-85Symbol:85Rb or 8537RbMass number A:85 (= number of nucleons)Atomic number Z:37 (= number of protons)Neutrons N:48Isotopic mass:84.91178974(3) u (atomic weight of Rubidium-85)Nuclide mass:84.8914931 u (calculated nuclear mass without electrons)Mass excess:-82.16733 MeVMass defect:0.793652412 u (per nucleus)Nuclear binding energy:739.28245986 MeV (per nucleus)
8.6974407 MeV (average binding energy per nucleon)
Separation energy:SN = 10.4797(22) MeV (first neutron)
SP = 7.01697 MeV (first proton)
Half-life:stableSpin and parity:
(nuclear angular momentum)
5/2-Magnetic dipole moment:μ(μN) = +1.35306(4)Charge radius:4.2036(23) femtometer fmYear of discovery:1921

 

Parent Nuclides

Direct parent isotopes are: 85Kr, 85Sr.

 

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 85Rb

Isotope:85Rb-NMRQuantity:72.17(2) %Spin:5/2-Nuclearmagnetic moment
μ/μN:
+1.35306(4)Gyromagnetic ratio γ:2.5923 · 107 rad T-1 s-1Nuclear g-factor:gl = 0.541224Quadrupole moment Q:+ 0.276(1) barn (100 fm2)Resonance frequency:v0 = 4.1253 at 1 TRelative Sensitivity:0.01061 (H0 = const.)
1.1304 (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
85mRb514.0065(22) keV1.015 μs9/2+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 48) and isobaric (same nucleon number A = 85) with Rubidium-85. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 48Isobar A = 85
2674Fe
2775Co
2876Ni
2977Cu
3078Zn85Zn
3179Ga85Ga
3280Ge85Ge
3381As85As
3482Se85Se
3583Br85Br
3684Kr85Kr
3785Rb85Rb
3886Sr85Sr
3987Y85Y
4088Zr85Zr
4189Nb85Nb
4290Mo85Mo
4391Tc85Tc
4492Ru85Ru
4593Rh
4694Pd
4795Ag
4896Cd
4997In

 

External data and identifiers

Adopted Levels, Gammas:NuDat 85Rb

 


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Last update: 2020-10-14


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