See also: List of individual Hafnium isotopes (and general data sources).
General data
Name of the isotope:Hafnium-165; Hf-165Symbol:165Hf or 16572HfMass number A:165 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:93Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.2916666666667 (= neutron-proton ratio)Neutron excess (N-Z):21Isotopic mass:164.94457(3) u (atomic weight of Hafnium-165)Nuclide mass:164.905076 u (calculated nuclear mass without electrons)Mass excess:-51.63271 MeVMass defect:1.424669492 u (per nucleus)Nuclear binding energy:1327.07108378 MeV (per nucleus) 8.04285505 MeV (average binding energy per nucleon)Separation energy:SN = 7.89(3) MeV (first neutron) SP = 4.28(4) MeV (first proton)Half-life:76(4) sDecay constant λ:0.0091203576389466 s-1Specific activity α:3.329850596674 × 10+19 Bq g-1 899959620.72295 Ci g-1Spin and parity: (nuclear angular momentum)(5/2-)Year of discovery:1981
Radioactive Decay
Half-life T½ = 76(4) s respectively 7.6 × 101 seconds s.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 93) and isobaric (same nucleon number A = 165) with Hafnium-165. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
