See also: List of individual Germanium isotopes (and general data sources).
General data
Name of the isotope:Germanium-78; Ge-78Symbol:78Ge or 7832GeMass number A:78 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:46Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4375 (= neutron-proton ratio)Neutron excess (N-Z):14Isotopic mass:77.922853(4) u (atomic weight of Germanium-78)Nuclide mass:77.905299 u (calculated nuclear mass without electrons)Mass excess:-71.86197 MeVMass defect:0.72613416 u (per nucleus)Nuclear binding energy:676.38961324 MeV (per nucleus) 8.67166171 MeV (average binding energy per nucleon)Separation energy:SN = 8.720(4) MeV (first neutron) SP = 13.159(4) MeV (first proton)Half-life:88.0(10) minDecay constant λ:0.00013127787510605 s-1Specific activity α:1.014559672965 × 10+18 Bq g-1 27420531.701776 Ci g-1Spin and parity: (nuclear angular momentum)0+Year of discovery:1953
Radioactive Decay
Half-life T½ = 88.0(10) min (minutes) respectively 5.280 × 103 seconds s.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 46) and isobaric (same nucleon number A = 78) with Germanium-78. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
