See also: List of individual Germanium isotopes (and general data sources).
General data
Name of the isotope:Germanium-72m; Ge-72mSymbol:72mGe or 72m32GeMass number A:72 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:40Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.25 (= neutron-proton ratio)Neutron excess (N-Z):8Excitation energy:691.43(4) keVIsotopic mass:71.9220758(5) u (atomic weight of Germanium-72m)Nuclide mass:71.9045218 u (calculated nuclear mass without electrons)Mass excess:-72.58592 MeVMass defect:0.674921864 u (per nucleus)Nuclear binding energy:628.68566678 MeV (per nucleus) 8.73174537 MeV (average binding energy per nucleon)Half-life:444.2(8) nsDecay constant λ:1560439.3979287 s-1Specific activity α:1.306578765594 × 10+28 Bq g-1 3.531293961066 × 10+17 Ci g-1Spin and parity: (nuclear angular momentum)0+
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 40) and isobaric (same nucleon number A = 72) with Germanium-72m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
