See also: List of individual Holmium isotopes (and general data sources).
General data
Name of the isotope:Holmium-165; Ho-165Symbol:165Ho or 16567HoMass number A:165 (= number of nucleons)Atomic number Z:67 (= number of protons)Neutrons N:98Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.4626865671642 (= neutron-proton ratio)Neutron excess (N-Z):31Isotopic mass:164.93033(2) u (atomic weight of Holmium-165)Nuclide mass:164.8935783 u (calculated nuclear mass without electrons)Mass excess:-64.89719 MeVMass defect:1.443108912 u (per nucleus)Nuclear binding energy:1344.24729287 MeV (per nucleus) 8.14695329 MeV (average binding energy per nucleon)Separation energy:SN = 7.9888(11) MeV (first neutron) SP = 6.2200(8) MeV (first proton)Half-life:stableSpin and parity: (nuclear angular momentum)7/2-Magnetic dipole moment:μ(μN) = + 4.177(5)Charge radius:5.2022(312) femtometer fmYear of discovery:1934
Comparison of the natural Holmium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
Atomic Mass ma
Quantity
Half-life
Spin
Holmium Isotopic mixture
164.930328 u
100 %
Isotope 165Ho
164.93033(2) u
100 %
stable
7/2-
NMR data
Nuclear magnetic properties and parameters of the NMR active Nuclide165Ho
Isotope:165Ho-NMRQuantity:100 %Spin:7/2-Nuclearmagnetic moment μ/μN:+ 4.177(5)Gyromagnetic ratio γ:5.71 · 107 rad T-1 s-1 9.08775 MHz T-1Nuclear g-factor:gl = 1.1934285714286Quadrupole moment Q:+3.58(2) barn (100 fm2)Line width parameter (factor):l = 17437.28 fm4Resonance frequency:v0 = 9.0883 MHz at 1 TRelative Sensitivity:[related to 1H = 1.000]: 0.20423 (H0 = const.) 4.4826 (v0 = const.)
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 98) and isobaric (same nucleon number A = 165) with Holmium-165. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
