Holmium-158
Properties and data of the isotope 158Ho.
See also: List of individual Holmium isotopes (and general data sources).
General data
Name of the isotope:Holmium-158; Ho-158Symbol:158Ho or 15867HoMass number A:158 (= number of nucleons)Atomic number Z:67 (= number of protons)Neutrons N:91Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3582089552239 (= neutron-proton ratio)Neutron excess (N-Z):24Isotopic mass:157.928945(29) u (atomic weight of Holmium-158)Nuclide mass:157.8921933 u (calculated nuclear mass without electrons)Mass excess:-66.18731 MeVMass defect:1.3838395 u (per nucleus)Nuclear binding energy:1289.03819121 MeV (per nucleus)
8.15846956 MeV (average binding energy per nucleon)Separation energy:SN = 7.43(4) MeV (first neutron)
SP = 4.052(27) MeV (first proton)Half-life:11.3(4) minDecay constant λ:0.0010223409742772 s-1Specific activity α:3.921453091708 × 10+18 Bq g-1
105985218.69482 Ci g-1Spin and parity:
(nuclear angular momentum)5+Magnetic dipole moment:μ(μN) = + 3.77(3)Quadrupole moment Q:+ 4.2(4) barn (100 fm2)Nuclear g-factor:gl = 0.754Charge radius:5.1571(316) femtometer fmYear of discovery:1961
Radioactive Decay
Half-life T½ = 11.3(4) min (minutes) respectively 6.78 × 102 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 158Dy | 100 % | 4.220(27) MeV | |
Parent Nuclides
Direct parent isotope is: 158Er.
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 |
|---|
| 158m1Ho | 67.20(1) keV | 28(2) min | 2- |
| 158m2Ho | 180 keV | 21.3(23) min | (9+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 91) and isobaric (same nucleon number A = 158) with Holmium-158. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 91 | Isobar A = 158 |
|---|
| 52 | 143Te | |
| 53 | 144I | |
| 54 | 145Xe | |
| 55 | 146Cs | |
| 56 | 147Ba | |
| 57 | 148La | |
| 58 | 149Ce | 158Ce |
| 59 | 150Pr | 158Pr |
| 60 | 151Nd | 158Nd |
| 61 | 152Pm | 158Pm |
| 62 | 153Sm | 158Sm |
| 63 | 154Eu | 158Eu |
| 64 | 155Gd | 158Gd |
| 65 | 156Tb | 158Tb |
| 66 | 157Dy | 158Dy |
| 67 | 158Ho | 158Ho |
| 68 | 159Er | 158Er |
| 69 | 160Tm | 158Tm |
| 70 | 161Yb | 158Yb |
| 71 | 162Lu | 158Lu |
| 72 | 163Hf | 158Hf |
| 73 | 164Ta | 158Ta |
| 74 | 165W | 158W |
| 75 | 166Re | |
| 76 | 167Os | |
| 77 | 168Ir | |
| 78 | 169Pt | |
| 79 | 170Au | |
| 80 | 171Hg | |
External data and identifiers
Last update: 2020-10-09
Perma link: https://www.chemlin.org/isotope/holmium-158
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