Rubidium-82

Properties and data of the isotope ⁸²Rb.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

Literature

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

General data

Name of the isotope:Rubidium-82; Rb-82Symbol:⁸²Rb or 8237RbMass number A:82 (= number of nucleons)Atomic number Z:37 (= number of protons)Neutrons N:45Isotopic mass:81.918209(3) u (atomic weight of Rubidium-82)Nuclide mass:81.8979123 u (calculated nuclear mass without electrons)Mass excess:-76.18783 MeVMass defect:0.761238404 u (per nucleus)Nuclear binding energy:709.0890059 MeV (per nucleus)
8.6474269 MeV (average binding energy per nucleon)Separation energy:S_N = 8.802(6) MeV (first neutron)
S_P = 5.781(3) MeV (first proton)Half-life:1.2575(2) minDecay constant λ:0.0091868413593101 s^-1Specific activity α:6.830179348599 × 10⁺¹⁹ Bq g^-1
1845994418.5405 Ci g^-1Spin and parity:
(nuclear angular momentum)1+Magnetic dipole moment:μ(μ_N) = +0.5545083(11)Quadrupole moment Q:+0.23(10) barn (100 fm²)Nuclear g-factor:g_l = 0.5545083Charge radius:4.2160(42) femtometer fmYear of discovery:1949

Radioactive Decay

Half-life T_½ = 1.2575(2) min (minutes) respectively 7.545 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁸²Kr	100 %	4.404(3) MeV

Parent Nuclides

Direct parent isotope is: ⁸²Sr.

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
^82mRb	69.0(15) keV	6.472(6) h	5-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 45) and isobaric (same nucleon number A = 82) with Rubidium-82. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 45	Isobar A = 82
23	⁶⁸V
25	⁷⁰Mn
26	⁷¹Fe
27	⁷²Co
28	⁷³Ni
29	⁷⁴Cu	⁸²Cu
30	⁷⁵Zn	⁸²Zn
31	⁷⁶Ga	⁸²Ga
32	⁷⁷Ge	⁸²Ge
33	⁷⁸As	⁸²As
34	⁷⁹Se	⁸²Se
35	⁸⁰Br	⁸²Br
36	⁸¹Kr	⁸²Kr
37	⁸²Rb	⁸²Rb
38	⁸³Sr	⁸²Sr
39	⁸⁴Y	⁸²Y
40	⁸⁵Zr	⁸²Zr
41	⁸⁶Nb	⁸²Nb
42	⁸⁷Mo	⁸²Mo
43	⁸⁸Tc
44	⁸⁹Ru
45	⁹⁰Rh
46	⁹¹Pd
47	⁹²Ag