See also: List of individual Hafnium isotopes (and general data sources).
General data
Name of the isotope:Hafnium-158; Hf-158Symbol:158Hf or 15872HfMass number A:158 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:86Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.1944444444444 (= neutron-proton ratio)Neutron excess (N-Z):14Isotopic mass:157.954801(19) u (atomic weight of Hafnium-158)Nuclide mass:157.915307 u (calculated nuclear mass without electrons)Mass excess:-42.1026 MeVMass defect:1.35378408 u (per nucleus)Nuclear binding energy:1261.04174782 MeV (per nucleus) 7.98127688 MeV (average binding energy per nucleon)Separation energy:SN = 11.27(20) MeV (first neutron) SP = 2.951(21) MeV (first proton)Half-life:2.85(7) sDecay constant λ:0.24320953703858 s-1Specific activity α:9.272539086803 × 10+20 Bq g-1 25060916450.82 Ci g-1Spin and parity: (nuclear angular momentum)0+Year of discovery:1965
The following table shows the atomic nuclei that are isotonic (same neutron number N = 86) and isobaric (same nucleon number A = 158) with Hafnium-158. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
