Rubidium-83

Properties and data of the isotope ⁸³Rb.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Rubidium-83; Rb-83Symbol:⁸³Rb or 8337RbMass number A:83 (= number of nucleons)Atomic number Z:37 (= number of protons)Neutrons N:46Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.2432432432432 (= neutron-proton ratio)Neutron excess (N-Z):9Isotopic mass:82.9151142(25) u (atomic weight of Rubidium-83)Nuclide mass:82.8948175 u (calculated nuclear mass without electrons)Mass excess:-79.07061 MeVMass defect:0.77299812 u (per nucleus)Nuclear binding energy:720.04311079 MeV (per nucleus)
8.6752182 MeV (average binding energy per nucleon)Separation energy:S_N = 10.954(4) MeV (first neutron)
S_P = 5.7678(23) MeV (first proton)Half-life:86.2(1) dDecay constant λ:9.306887252942 × 10^-8 s^-1Specific activity α:6.835047073752 × 10⁺¹⁴ Bq g^-1
18473.100199331 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2-Magnetic dipole moment:μ(μ_N) = + 1.4246(8)Quadrupole moment Q:+ 1.96(22) barn (100 fm²)Nuclear g-factor:g_l = 0.56984Charge radius:4.2058(28) femtometer fmYear of discovery:1950

Radioactive Decay

Half-life T_½ = 86.2(1) d respectively 7.447680 × 10⁶ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC	⁸³Kr	100 %	0.9200(23) MeV

Parent Nuclides

Direct parent isotope is: ⁸³Sr.

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
^83mRb	42.078(2) keV	0.3 ms	9/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 46) and isobaric (same nucleon number A = 83) with Rubidium-83. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 46	Isobar A = 83
25	⁷¹Mn
26	⁷²Fe
27	⁷³Co
28	⁷⁴Ni
29	⁷⁵Cu
30	⁷⁶Zn	⁸³Zn
31	⁷⁷Ga	⁸³Ga
32	⁷⁸Ge	⁸³Ge
33	⁷⁹As	⁸³As
34	⁸⁰Se	⁸³Se
35	⁸¹Br	⁸³Br
36	⁸²Kr	⁸³Kr
37	⁸³Rb	⁸³Rb
38	⁸⁴Sr	⁸³Sr
39	⁸⁵Y	⁸³Y
40	⁸⁶Zr	⁸³Zr
41	⁸⁷Nb	⁸³Nb
42	⁸⁸Mo	⁸³Mo
43	⁸⁹Tc
44	⁹⁰Ru
45	⁹¹Rh
46	⁹²Pd
47	⁹³Ag
48	⁹⁴Cd