Rubidium-86
Properties and data of the isotope 86Rb.
See also: List of individual Rubidium isotopes (and general data sources).
General data
Name of the isotope:Rubidium-86; Rb-86Symbol:86Rb or 8637RbMass number A:86 (= number of nucleons)Atomic number Z:37 (= number of protons)Neutrons N:49Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3243243243243 (= neutron-proton ratio)Neutron excess (N-Z):12Isotopic mass:85.91116744(21) u (atomic weight of Rubidium-86)Nuclide mass:85.8908708 u (calculated nuclear mass without electrons)Mass excess:-82.747 MeVMass defect:0.802939628 u (per nucleus)Nuclear binding energy:747.93344584 MeV (per nucleus)
8.69690053 MeV (average binding energy per nucleon)Separation energy:SN = 8.65098(20) MeV (first neutron)
SP = 8.5556(20) MeV (first proton)Half-life:18.642(18) dDecay constant λ:4.303474311788 × 10-7 s-1Specific activity α:3.048956293260 × 10+15 Bq g-1
82404.224142165 Ci g-1Spin and parity:
(nuclear angular momentum)2-Magnetic dipole moment:μ(μN) = - 1.6974(16)Quadrupole moment Q:+0.23(6) barn (100 fm2)Nuclear g-factor:gl = -0.8487Charge radius:4.2025(23) femtometer fmYear of discovery:1941
Radioactive Decay
Half-life T½ = 18.642(18) d respectively 1.6106688 × 106 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 86Kr | 0.0052(5) % | 0.51867(20) MeV | |
| β- | 85Sr | 99.9948(5) % | 1.7761(2) MeV | |
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
| Nuclear Isomer | Excitation Energy | Half-life | Spin |
|---|
| 86mRb | 556.05(18) keV | 1.017(3) min | 6- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 49) and isobaric (same nucleon number A = 86) with Rubidium-86. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 49 | Isobar A = 86 |
|---|
| 27 | 76Co | |
| 28 | 77Ni | |
| 29 | 78Cu | |
| 30 | 79Zn | |
| 31 | 80Ga | 86Ga |
| 32 | 81Ge | 86Ge |
| 33 | 82As | 86As |
| 34 | 83Se | 86Se |
| 35 | 84Br | 86Br |
| 36 | 85Kr | 86Kr |
| 37 | 86Rb | 86Rb |
| 38 | 87Sr | 86Sr |
| 39 | 88Y | 86Y |
| 40 | 89Zr | 86Zr |
| 41 | 90Nb | 86Nb |
| 42 | 91Mo | 86Mo |
| 43 | 92Tc | 86Tc |
| 44 | 93Ru | 86Ru |
| 45 | 94Rh | |
| 46 | 95Pd | |
| 47 | 96Ag | |
| 48 | 97Cd | |
| 49 | 98In | |
| 50 | 99Sn | |
External data and identifiers
Last update: 2020-10-14
Perma link: https://www.chemlin.org/isotope/rubidium-86
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