See also: List of individual Germanium isotopes (and general data sources).
General data
Name of the isotope:Germanium-64; Ge-64Symbol:64Ge or 6432GeMass number A:64 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:32Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1 (= neutron-proton ratio)Neutron excess (N-Z):0Isotopic mass:63.94169(4) u (atomic weight of Germanium-64)Nuclide mass:63.924136 u (calculated nuclear mass without electrons)Mass excess:-54.31542 MeVMass defect:0.58598833600001 u (per nucleus)Nuclear binding energy:545.84461905 MeV (per nucleus) 8.52882217 MeV (average binding energy per nucleon)Separation energy:SN = 15.47(4) MeV (first neutron) SP = 5.057(4) MeV (first proton)Half-life:63.7(25) sDecay constant λ:0.010881431405965 s-1Specific activity α:1.024832337040 × 10+20 Bq g-1 2769817127.1359 Ci g-1Spin and parity: (nuclear angular momentum)0+Year of discovery:1972
Radioactive Decay
Half-life T½ = 63.7(25) s respectively 6.37 × 101 seconds s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
EC/β+
64Ga
100 %
4.517(4) MeV
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 32) and isobaric (same nucleon number A = 64) with Germanium-64. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
