See also: List of individual Terbium isotopes (and general data sources).
General data
Name of the isotope:Terbium-159; Tb-159Symbol:159Tb or 15965TbMass number A:159 (= number of nucleons)Atomic number Z:65 (= number of protons)Neutrons N:94Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.4461538461538 (= neutron-proton ratio)Neutron excess (N-Z):29Isotopic mass:158.92535(2) u (atomic weight of Terbium-159)Nuclide mass:158.8896953 u (calculated nuclear mass without electrons)Mass excess:-69.53603 MeVMass defect:1.397779184 u (per nucleus)Nuclear binding energy:1302.02292322 MeV (per nucleus) 8.18882342 MeV (average binding energy per nucleon)Separation energy:SN = 8.1330(6) MeV (first neutron) SP = 6.1318(8) MeV (first proton)Half-life:stableSpin and parity: (nuclear angular momentum)3/2+Magnetic dipole moment:μ(μN) = + 2.014(4)Charge radius:5.0600(1500) femtometer fmYear of discovery:1933
Comparison of the natural Terbium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
Atomic Mass ma
Quantity
Half-life
Spin
Terbium Isotopic mixture
158.925354 u
100 %
Isotope 159Tb
158.92535(2) u
100 %
stable
3/2+
NMR data
Nuclear magnetic properties and parameters of the NMR active Nuclide159Tb
Isotope:159Tb-NMRQuantity:100 %Spin:3/2+Nuclearmagnetic moment μ/μN:+ 2.014(4)Gyromagnetic ratio γ:6.4306 · 107 rad T-1 s-1 10.23462 MHz T-1Nuclear g-factor:gl = 1.3426666666667Quadrupole moment Q:+1.432(8) barn (100 fm2)Line width parameter (factor):l = 27341.65 fm4Resonance frequency:v0 = 10.23 MHz at 1 TRelative Sensitivity:[related to 1H = 1.000]: 0.06945 (H0 = const.) 1.2019 (v0 = const.)
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 94) and isobaric (same nucleon number A = 159) with Terbium-159. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
