See also: List of individual Germanium isotopes (and general data sources).
General data
Name of the isotope:Germanium-76; Ge-76Symbol:76Ge or 7632GeMass number A:76 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:44Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.375 (= neutron-proton ratio)Neutron excess (N-Z):12Isotopic mass:75.9214027(2) u (atomic weight of Germanium-76)Nuclide mass:75.9038487 u (calculated nuclear mass without electrons)Mass excess:-73.21291 MeVMass defect:0.710254628 u (per nucleus)Nuclear binding energy:661.59792445 MeV (per nucleus) 8.70523585 MeV (average binding energy per nucleon)Separation energy:SN = 9.42724(5) MeV (first neutron) SP = 12.0373(24) MeV (first proton)Half-life:1.926(94) × 1021 yearsDecay constant λ:1.141202124075 × 10-29 s-1Specific activity α:9.052098067719 × 10-8 Bq g-1 2.446512991275 × 10-18 Ci g-1Spin and parity: (nuclear angular momentum)0+Charge radius:4.0811(11) femtometer fmYear of discovery:1933
Radioactive Decay
Half-life T½ = 1.926(94) × 1021 years respectively 6.0738336 × 1028 seconds s.
Comparison of the natural Germanium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
Atomic Mass ma
Quantity
Half-life
Spin
Germanium Isotopic mixture
72.630 u
100 %
Isotope 70Ge
69.924249(6) u
20.52(19) %
stable
0+
Isotope 72Ge
71.9220758(5) u
27.45(15) %
stable
0+
Isotope 74Ge
73.92117776(9) u
36.52(12) %
stable
0+
Isotope 76Ge
75.9214027(2) u
7.75(12) %
1.926(94) × 1021 years
0+
Isotope 73Ge
72.92345895(6) u
7.76(8) %
stable
9/2+
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 44) and isobaric (same nucleon number A = 76) with Germanium-76. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
