See also: List of individual Holmium isotopes (and general data sources).
General data
Name of the isotope:Holmium-156m1; Ho-156m1Symbol:156m1Ho or 156m167HoMass number A:156 (= number of nucleons)Atomic number Z:67 (= number of protons)Neutrons N:89Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3283582089552 (= neutron-proton ratio)Neutron excess (N-Z):22Excitation energy:52.37 keVIsotopic mass:155.92971(6) u (atomic weight of Holmium-156m1)Nuclide mass:155.8929583 u (calculated nuclear mass without electrons)Mass excess:-65.47471 MeVMass defect:1.365744668 u (per nucleus)Nuclear binding energy:1272.18296377 MeV (per nucleus) 8.155019 MeV (average binding energy per nucleon)Half-life:9.5(15) sDecay constant λ:0.072962861111573 s-1Specific activity α:2.817889033887 × 10+20 Bq g-1 7615916307.8035 Ci g-1Spin and parity: (nuclear angular momentum)1-
Radioactive Decay
Half-life T½ = 9.5(15) s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
Iso
156Ho
100 %
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 = 89) and isobaric (same nucleon number A = 156) with Holmium-156m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
