Rubidium-94

Properties and data of the isotope ⁹⁴Rb.

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-94; Rb-94Symbol:⁹⁴Rb or 9437RbMass number A:94 (= number of nucleons)Atomic number Z:37 (= number of protons)Neutrons N:57Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.5405405405405 (= neutron-proton ratio)Neutron excess (N-Z):20Isotopic mass:93.9263948(22) u (atomic weight of Rubidium-94)Nuclide mass:93.9060981 u (calculated nuclear mass without electrons)Mass excess:-68.5628 MeVMass defect:0.85703159600001 u (per nucleus)Nuclear binding energy:798.31978948 MeV (per nucleus)
8.49276372 MeV (average binding energy per nucleon)Separation energy:S_N = 4.014(8) MeV (first neutron)
S_P = 11.716(3) MeV (first proton)Half-life:2.702(5) sDecay constant λ:0.25653115490746 s^-1Specific activity α:1.661147042811 × 10⁺²¹ Bq g^-1
44895866021.941 Ci g^-1Spin and parity:
(nuclear angular momentum)3(-)Magnetic dipole moment:μ(μ_N) = + 1.4981(18)Quadrupole moment Q:+ 0.163(50) barn (100 fm²)Nuclear g-factor:g_l = 0.49936666666667Charge radius:4.3184(211) femtometer fmYear of discovery:1961

Radioactive Decay

Half-life T_½ = 2.702(5) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁹⁴Sr	89.5(4) %	10.2829(26) MeV
β^-, n	⁹³Sr	10.5(4) %	3.452(8) MeV

Parent Nuclides

Direct parent isotope is: ⁹⁴Kr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 57) and isobaric (same nucleon number A = 94) with Rubidium-94. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 57	Isobar A = 94
32	⁸⁹Ge
33	⁹⁰As
34	⁹¹Se	⁹⁴Se
35	⁹²Br	⁹⁴Br
36	⁹³Kr	⁹⁴Kr
37	⁹⁴Rb	⁹⁴Rb
38	⁹⁵Sr	⁹⁴Sr
39	⁹⁶Y	⁹⁴Y
40	⁹⁷Zr	⁹⁴Zr
41	⁹⁸Nb	⁹⁴Nb
42	⁹⁹Mo	⁹⁴Mo
43	¹⁰⁰Tc	⁹⁴Tc
44	¹⁰¹Ru	⁹⁴Ru
45	¹⁰²Rh	⁹⁴Rh
46	¹⁰³Pd	⁹⁴Pd
47	¹⁰⁴Ag	⁹⁴Ag
48	¹⁰⁵Cd	⁹⁴Cd
49	¹⁰⁶In
50	¹⁰⁷Sn
51	¹⁰⁸Sb
52	¹⁰⁹Te
53	¹¹⁰I
54	¹¹¹Xe
55	¹¹²Cs