Holmium-166m
Properties and data of the isotope 166Ho.
See also: list of Holmium isotopes.
General data
Name of the isotope:Holmium-166m; Ho-166mSymbol:166Ho or 16667HoMass number A:166 (= number of nucleons)Atomic number Z:67 (= number of protons)Neutrons N:99Isotopic mass:165.9322901(11) u (atomic weight of Holmium-166m)
Excitation energy: 5.969(12) keVNuclide mass:165.8955384 u (calculated nuclear mass without electrons)Mass excess:-63.07137 MeVMass defect:1.449813728 u (per nucleus)Nuclear binding energy:1350.49278875 MeV (per nucleus)
8.13549873 MeV (average binding energy per nucleon)Half-life:1200(180) aDecay constant λ:1.831639089289 × 10-11 s-1Specific activity α:66850840001.634 Bq g-1
1.8067794595036 Ci g-1Spin and parity:
(nuclear angular momentum)7-Magnetic dipole moment:μ(μN) = 3.60(5)Quadrupole moment Q:- 0.03(3) barn (100 fm2)Nuclear g-factor:gl = 0.51428571428571
Radioactive Decay
Half-life T½ = 1200(180) a respectively 3.7843 × 1010 seconds s.
| Decay mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 166Er | 100 % | | |
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
| Nuclear Isomer | Excitation Energy | Half-life | Spin |
|---|
| 166Ho | | 26.824(12) h | 0- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 99) and isobaric (same nucleon number A = 166) with Holmium-166m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| OZ | Isotone N = 99 | Isobar A = 166 |
|---|
| 57 | 156La | |
| 58 | 157Ce | |
| 59 | 158Pr | |
| 60 | 159Nd | |
| 61 | 160Pm | |
| 62 | 161Sm | 166Sm |
| 63 | 162Eu | 166Eu |
| 64 | 163Gd | 166Gd |
| 65 | 164Tb | 166Tb |
| 66 | 165Dy | 166Dy |
| 67 | 166Ho | 166Ho |
| 68 | 167Er | 166Er |
| 69 | 168Tm | 166Tm |
| 70 | 169Yb | 166Yb |
| 71 | 170Lu | 166Lu |
| 72 | 171Hf | 166Hf |
| 73 | 172Ta | 166Ta |
| 74 | 173W | 166W |
| 75 | 174Re | 166Re |
| 76 | 175Os | 166Os |
| 77 | 176Ir | 166Ir |
| 78 | 177Pt | 166Pt |
| 79 | 178Au | |
| 80 | 179Hg | |
| 81 | 180Tl | |
| 82 | 181Pb | |
Last update: 2020-10-09
Perma link: https://www.chemlin.org/isotope/holmium-166m
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