See also: List of individual Dysprosium isotopes (and general data sources).
General data
Name of the isotope:Dysprosium-165; Dy-165Symbol:165Dy or 16566DyMass number A:165 (= number of nucleons)Atomic number Z:66 (= number of protons)Neutrons N:99Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.5 (= neutron-proton ratio)Neutron excess (N-Z):33Isotopic mass:164.9317094(7) u (atomic weight of Dysprosium-165)Nuclide mass:164.8955062 u (calculated nuclear mass without electrons)Mass excess:-63.61228 MeVMass defect:1.442569396 u (per nucleus)Nuclear binding energy:1343.74473696 MeV (per nucleus) 8.1439075 MeV (average binding energy per nucleon)Separation energy:SN = 5.71596(5) MeV (first neutron) SP = 8.7963(20) MeV (first proton)Half-life:2.334(1) hDecay constant λ:8.249395179471 × 10-5 s-1Specific activity α:3.012096287388 × 10+17 Bq g-1 8140800.7767268 Ci g-1Spin and parity: (nuclear angular momentum)7/2+Magnetic dipole moment:μ(μN) = - 0.520(5)Quadrupole moment Q:+3.48(7) barn (100 fm2)Nuclear g-factor:gl = -0.14857142857143Year of discovery:1935
Radioactive Decay
Half-life T½ = 2.334(1) h (hours) respectively 8.4024 × 103 seconds s.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 99) and isobaric (same nucleon number A = 165) with Dysprosium-165. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
