See also: List of individual Dysprosium isotopes (and general data sources).
General data
Name of the isotope:Dysprosium-164; Dy-164Symbol:164Dy or 16466DyMass number A:164 (= number of nucleons)Atomic number Z:66 (= number of protons)Neutrons N:98Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4848484848485 (= neutron-proton ratio)Neutron excess (N-Z):32Isotopic mass:163.92918(2) u (atomic weight of Dysprosium-164)Nuclide mass:163.8929768 u (calculated nuclear mass without electrons)Mass excess:-65.96841 MeVMass defect:1.43643388 u (per nucleus)Nuclear binding energy:1338.02954062 MeV (per nucleus) 8.15871671 MeV (average binding energy per nucleon)Separation energy:SN = 7.65811(7) MeV (first neutron) SP = 8.661(4) MeV (first proton)Half-life:stableSpin and parity: (nuclear angular momentum)0+Charge radius:5.2218(106) femtometer fmYear of discovery:1934
Comparison of the natural Dysprosium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
Atomic Mass ma
Quantity
Half-life
Spin
Dysprosium Isotopic mixture
162.500 u
100 %
Isotope 156Dy
155.92428(2) u
0.056(3) %
stable
0+
Isotope 158Dy
157.92442(2) u
0.095(3) %
stable
0+
Isotope 160Dy
159.92520(2) u
2.329(18) %
stable
0+
Isotope 161Dy
160.92694(2) u
18.889(42) %
stable
5/2+
Isotope 162Dy
161.92681(2) u
25.475(36) %
stable
0+
Isotope 163Dy
162.92874(2) u
24.896(42) %
stable
5/2-
Isotope 164Dy
163.92918(2) u
28.260(54) %
stable
0+
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 98) and isobaric (same nucleon number A = 164) with Dysprosium-164. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
