See also: List of individual Zinc isotopes (and general data sources).
General data
Name of the isotope:Zinc-64; Zn-64Symbol:64Zn or 6430ZnMass number A:64 (= number of nucleons)Atomic number Z:30 (= number of protons)Neutrons N:34Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.1333333333333 (= neutron-proton ratio)Neutron excess (N-Z):4Isotopic mass:63.929142(5) u (atomic weight of Zinc-64)Nuclide mass:63.9126851 u (calculated nuclear mass without electrons)Mass excess:-66.0038 MeVMass defect:0.60021610400001 u (per nucleus)Nuclear binding energy:559.09769958 MeV (per nucleus) 8.73590156 MeV (average binding energy per nucleon)Separation energy:SN = 11.8619(15) MeV (first neutron) SP = 7.7132(6) MeV (first proton)Half-life:stableSpin and parity: (nuclear angular momentum)0+Charge radius:3.9283(15) femtometer fmMirror nucleus:Selenium-64Year of discovery:1922
Comparison of the natural Zinc isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
Atomic Mass ma
Quantity
Half-life
Spin
Zinc Isotopic mixture
65.38 u
100 %
Isotope 64Zn
63.929142(5) u
49.17(75) %
stable
0+
Isotope 66Zn
65.926034(6) u
27.73(98) %
stable
0+
Isotope 67Zn
66.9271274(8) u
4.04(16) %
stable
5/2-
Isotope 68Zn
67.924845(6) u
18.45(63) %
stable
0+
Isotope 70Zn
69.92532(2) u
0.61(10) %
3.8 × 1018 years
0+
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 34) and isobaric (same nucleon number A = 64) with Zinc-64. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
