Holmium-154m
Properties and data of the isotope 154Ho.
See also: list of Holmium isotopes.
General data
Name of the isotope:Holmium-154m; Ho-154mSymbol:154Ho or 15467HoMass number A:154 (= number of nucleons)Atomic number Z:67 (= number of protons)Neutrons N:87Isotopic mass:153.930607(9) u (atomic weight of Holmium-154m)
Excitation energy: +X keVNuclide mass:153.8938553 u (calculated nuclear mass without electrons)Mass excess:-64.63916 MeVMass defect:1.347517836 u (per nucleus)Nuclear binding energy:1255.20477913 MeV (per nucleus)
8.15068038 MeV (average binding energy per nucleon)Half-life:3.10(14) minDecay constant λ:0.0037265977449459 s-1Specific activity α:1.46680369597 × 10+19 Bq g-1
396433431.34405 Ci g-1Spin and parity:
(nuclear angular momentum)8+Magnetic dipole moment:μ(μN) = 5.63(6)Quadrupole moment Q:-1.00(5) barn (100 fm2)Nuclear g-factor:gl = 0.70375
Radioactive Decay
Half-life T½ = 3.10(14) min (minutes) respectively 1.86 × 102 seconds s.
| Decay mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EE/β+ | 154Dy | > 99 % | | |
| α | 150Tb | < 0.001 % | | |
| Iso | 154Ho | ca. 0 % | | |
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 |
|---|
| 154Ho | | 11.76(19) min | 2- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 87) and isobaric (same nucleon number A = 154) with Holmium-154m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| OZ | Isotone N = 87 | Isobar A = 154 |
|---|
| 49 | 136In | |
| 50 | 137Sn | |
| 51 | 138Sb | |
| 52 | 139Te | |
| 53 | 140I | |
| 54 | 141Xe | |
| 55 | 142Cs | |
| 56 | 143Ba | |
| 57 | 144La | 154La |
| 58 | 145Ce | 154Ce |
| 59 | 146Pr | 154Pr |
| 60 | 147Nd | 154Nd |
| 61 | 148Pm | 154Pm |
| 62 | 149Sm | 154Sm |
| 63 | 150Eu | 154Eu |
| 64 | 151Gd | 154Gd |
| 65 | 152Tb | 154Tb |
| 66 | 153Dy | 154Dy |
| 67 | 154Ho | 154Ho |
| 68 | 155Er | 154Er |
| 69 | 156Tm | 154Tm |
| 70 | 157Yb | 154Yb |
| 71 | 158Lu | 154Lu |
| 72 | 159Hf | 154Hf |
| 73 | 160Ta | |
| 74 | 161W | |
| 75 | 162Re | |
| 76 | 163Os | |
| 77 | 164Ir | |
Last update: 2020-10-08
Perma link: https://www.chemlin.org/isotope/holmium-154m
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