Ruthenium-89

Properties and data of the isotope ⁸⁹Ru.

Content

General data

Name of the isotope:Ruthenium-89; Ru-89Symbol:⁸⁹Ru or 8944RuMass number A:89 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:45Isotopic mass:88.93745(32) u (atomic weight of Ruthenium-89)Nuclide mass:88.9133137 u (calculated nuclear mass without electrons)Mass excess:-58.26495 MeVMass defect:0.796772628 u (per nucleus)Nuclear binding energy:742.18892235 MeV (per nucleus)
8.33920137 MeV (average binding energy per nucleon)Separation energy:S_N = 11.99(42) MeV (first neutron)
S_P = 3.87(33) MeV (first proton)Half-life:1.5(2) sDecay constant λ:0.4620981203733 s^-1Specific activity α:3.162295422727 × 10⁺²¹ Bq g^-1
85467443857.495 Ci g^-1Spin and parity:
(nuclear angular momentum)(9/2+)Mirror nucleus:Rhodium-89Year of discovery:1992

Radioactive Decay

Half-life T_½ = 1.5(2) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	⁸⁹Tc	ca. 97 %	9.13(30) MeV
ε, p	⁸⁸Mo	ca. 3 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 45) and isobaric (same nucleon number A = 89) with Ruthenium-89. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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