See also: List of individual Germanium isotopes (and general data sources).
General data
Name of the isotope:Germanium-77; Ge-77Symbol:77Ge or 7732GeMass number A:77 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:45Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.40625 (= neutron-proton ratio)Neutron excess (N-Z):13Isotopic mass:76.92354984(6) u (atomic weight of Germanium-77)Nuclide mass:76.9059959 u (calculated nuclear mass without electrons)Mass excess:-71.21287 MeVMass defect:0.716772404 u (per nucleus)Nuclear binding energy:667.66919369 MeV (per nucleus) 8.67102849 MeV (average binding energy per nucleon)Separation energy:SN = 6.07129(5) MeV (first neutron) SP = 12.2052(20) MeV (first proton)Half-life:11.211(3) hDecay constant λ:1.717428271241 × 10-5 s-1Specific activity α:1.344529057243 × 10+17 Bq g-1 3633862.3168741 Ci g-1Spin and parity: (nuclear angular momentum)7/2+Year of discovery:1939
Radioactive Decay
Half-life T½ = 11.211(3) h (hours) respectively 4.03596 × 104 seconds s.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 45) and isobaric (same nucleon number A = 77) with Germanium-77. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
