Germanium-89

Properties and data of the isotope ⁸⁹Ge.

Contents

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

General data

Name of the isotope:Germanium-89; Ge-89Symbol:⁸⁹Ge or 8932GeMass number A:89 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:57Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.78125 (= neutron-proton ratio)Neutron excess (N-Z):25Isotopic mass:88.96379(43) u (atomic weight of Germanium-89)Nuclide mass:88.946236 u (calculated nuclear mass without electrons)Mass excess:-33.7294 MeVMass defect:0.78051123600001 u (per nucleus)Nuclear binding energy:727.04153327 MeV (per nucleus)
8.16900599 MeV (average binding energy per nucleon)Separation energy:S_N = 1.66(56) MeV (first neutron)Half-life:300 nsDecay constant λ:2310490.6018665 s^-1Specific activity α:1.564018307796 × 10⁺²⁸ Bq g^-1
4.227076507558 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+Year of discovery:1997

Radioactive Decay

Half-life T_½ = 300 ns respectively 3.0 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	⁸⁹As	?	13.07(50) MeV
β^-, n	⁸⁸As	?	8.92(44) MeV
β^-, 2n	⁸⁷As	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 57) and isobaric (same nucleon number A = 89) with Germanium-89. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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