See also: List of individual Holmium isotopes (and general data sources).
General data
Name of the isotope:Holmium-164; Ho-164Symbol:164Ho or 16467HoMass number A:164 (= number of nucleons)Atomic number Z:67 (= number of protons)Neutrons N:97Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4477611940299 (= neutron-proton ratio)Neutron excess (N-Z):30Isotopic mass:163.9302395(16) u (atomic weight of Holmium-164)Nuclide mass:163.8934878 u (calculated nuclear mass without electrons)Mass excess:-64.98149 MeVMass defect:1.434534496 u (per nucleus)Nuclear binding energy:1336.26027582 MeV (per nucleus) 8.14792851 MeV (average binding energy per nucleon)Separation energy:SN = 6.6745(14) MeV (first neutron) SP = 5.8893(14) MeV (first proton)Half-life:28.8(5) minDecay constant λ:0.00040112684060182 s-1Specific activity α:1.47357943481 × 10+18 Bq g-1 39826471.21127 Ci g-1Spin and parity: (nuclear angular momentum)1+Year of discovery:1938
Radioactive Decay
Half-life T½ = 28.8(5) min (minutes) respectively 1.728 × 103 seconds s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
EC/β+
164Dy
60(5) %
0.9865(17) MeV
β-
164Er
40(5) %
0.9614(14) MeV
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 97) and isobaric (same nucleon number A = 164) with Holmium-164. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
