Rubidium-93

Properties and data of the isotope ⁹³Rb.

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-93; Rb-93Symbol:⁹³Rb or 9337RbMass number A:93 (= number of nucleons)Atomic number Z:37 (= number of protons)Neutrons N:56Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.5135135135135 (= neutron-proton ratio)Neutron excess (N-Z):19Isotopic mass:92.922039(8) u (atomic weight of Rubidium-93)Nuclide mass:92.9017423 u (calculated nuclear mass without electrons)Mass excess:-72.6202 MeVMass defect:0.85272248 u (per nucleus)Nuclear binding energy:794.30587379 MeV (per nucleus)
8.54092337 MeV (average binding energy per nucleon)Separation energy:S_N = 5.919(10) MeV (first neutron)
S_P = 11.140(8) MeV (first proton)Half-life:5.84(2) sDecay constant λ:0.11868958571232 s^-1Specific activity α:7.769189171381 × 10⁺²⁰ Bq g^-1
20997808571.302 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2-Magnetic dipole moment:μ(μ_N) = + 1.4092(16)Quadrupole moment Q:+ 0.18(4) barn (100 fm²)Nuclear g-factor:g_l = 0.56368Charge radius:4.3048(187) femtometer fmYear of discovery:1960

Radioactive Decay

Half-life T_½ = 5.84(2) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁹³Sr	98.61(7) %	7.466(9) MeV
β^-, n	⁹²Sr	1.39(7) %	2.1776(9) MeV

Parent Nuclides

Direct parent isotopes are: ⁹³Kr, ⁹⁴Kr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 56) and isobaric (same nucleon number A = 93) with Rubidium-93. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 56	Isobar A = 93
31	⁸⁷Ga
32	⁸⁸Ge
33	⁸⁹As
34	⁹⁰Se	⁹³Se
35	⁹¹Br	⁹³Br
36	⁹²Kr	⁹³Kr
37	⁹³Rb	⁹³Rb
38	⁹⁴Sr	⁹³Sr
39	⁹⁵Y	⁹³Y
40	⁹⁶Zr	⁹³Zr
41	⁹⁷Nb	⁹³Nb
42	⁹⁸Mo	⁹³Mo
43	⁹⁹Tc	⁹³Tc
44	¹⁰⁰Ru	⁹³Ru
45	¹⁰¹Rh	⁹³Rh
46	¹⁰²Pd	⁹³Pd
47	¹⁰³Ag	⁹³Ag
48	¹⁰⁴Cd
49	¹⁰⁵In
50	¹⁰⁶Sn
51	¹⁰⁷Sb
52	¹⁰⁸Te
53	¹⁰⁹I
54	¹¹⁰Xe