Holmium-159
Properties and data of the isotope 159Ho.
See also: List of individual Holmium isotopes (and general data sources).
General data
Name of the isotope:Holmium-159; Ho-159Symbol:159Ho or 15967HoMass number A:159 (= number of nucleons)Atomic number Z:67 (= number of protons)Neutrons N:92Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.3731343283582 (= neutron-proton ratio)Neutron excess (N-Z):25Isotopic mass:158.927719(3) u (atomic weight of Holmium-159)Nuclide mass:158.8909673 u (calculated nuclear mass without electrons)Mass excess:-67.32932 MeVMass defect:1.393730416 u (per nucleus)Nuclear binding energy:1298.25152012 MeV (per nucleus)
8.1651039 MeV (average binding energy per nucleon)Separation energy:SN = 9.213(27) MeV (first neutron)
SP = 4.211(4) MeV (first proton)Half-life:33.05(11) minDecay constant λ:0.0003495447204034 s-1Specific activity α:1.33228325513 × 10+18 Bq g-1
36007655.544243 Ci g-1Spin and parity:
(nuclear angular momentum)7/2-Magnetic dipole moment:μ(μN) = + 4.28(3)Quadrupole moment Q:+ 3.19(13) barn (100 fm2)Nuclear g-factor:gl = 1.2228571428571Charge radius:5.1675(314) femtometer fmYear of discovery:1958
Radioactive Decay
Half-life T½ = 33.05(11) min (minutes) respectively 1.983 × 103 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 159Dy | 100 % | 1.838(3) MeV | |
Parent Nuclides
Direct parent isotope is: 159Er.
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 |
|---|
| 159mHo | 205.91(5) keV | 8.30(8) s | 1/2+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 92) and isobaric (same nucleon number A = 159) with Holmium-159. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 92 | Isobar A = 159 |
|---|
| 53 | 145I | |
| 54 | 146Xe | |
| 55 | 147Cs | |
| 56 | 148Ba | |
| 57 | 149La | |
| 58 | 150Ce | 159Ce |
| 59 | 151Pr | 159Pr |
| 60 | 152Nd | 159Nd |
| 61 | 153Pm | 159Pm |
| 62 | 154Sm | 159Sm |
| 63 | 155Eu | 159Eu |
| 64 | 156Gd | 159Gd |
| 65 | 157Tb | 159Tb |
| 66 | 158Dy | 159Dy |
| 67 | 159Ho | 159Ho |
| 68 | 160Er | 159Er |
| 69 | 161Tm | 159Tm |
| 70 | 162Yb | 159Yb |
| 71 | 163Lu | 159Lu |
| 72 | 164Hf | 159Hf |
| 73 | 165Ta | 159Ta |
| 74 | 166W | 159W |
| 75 | 167Re | 159Re |
| 76 | 168Os | |
| 77 | 169Ir | |
| 78 | 170Pt | |
| 79 | 171Au | |
| 80 | 172Hg | |
External data and identifiers
Last update: 2020-10-09
Perma link: https://www.chemlin.org/isotope/holmium-159
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