See also: List of individual Cobalt isotopes (and general data sources).
General data
Name of the isotope:Cobalt-65; Co-65Symbol:65Co or 6527CoMass number A:65 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:38Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.4074074074074 (= neutron-proton ratio)Neutron excess (N-Z):11Isotopic mass:64.9364621(22) u (atomic weight of Cobalt-65)Nuclide mass:64.9216508 u (calculated nuclear mass without electrons)Mass excess:-59.18517 MeVMass defect:0.604080572 u (per nucleus)Nuclear binding energy:562.69742833 MeV (per nucleus) 8.65688351 MeV (average binding energy per nucleon)Separation energy:SN = 7.464(20) MeV (first neutron) SP = 11.505(5) MeV (first proton)Half-life:1.16(3) sDecay constant λ:0.5975406728965 s-1Specific activity α:5.541530791231 × 10+21 Bq g-1 149771102465.72 Ci g-1Spin and parity: (nuclear angular momentum)(7/2)-Year of discovery:1978
The following table shows the atomic nuclei that are isotonic (same neutron number N = 38) and isobaric (same nucleon number A = 65) with Cobalt-65. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
