Holmium-163
Properties and data of the isotope 163Ho.
See also: List of individual Holmium isotopes (and general data sources).
General data
Name of the isotope:Holmium-163; Ho-163Symbol:163Ho or 16367HoMass number A:163 (= number of nucleons)Atomic number Z:67 (= number of protons)Neutrons N:96Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.4328358208955 (= neutron-proton ratio)Neutron excess (N-Z):29Isotopic mass:162.9287399(8) u (atomic weight of Holmium-163)Nuclide mass:162.8919882 u (calculated nuclear mass without electrons)Mass excess:-66.37836 MeVMass defect:1.42736918 u (per nucleus)Nuclear binding energy:1329.58582695 MeV (per nucleus)
8.15696826 MeV (average binding energy per nucleon)Separation energy:SN = 8.408(3) MeV (first neutron)
SP = 5.48583(5) MeV (first proton)Half-life:4570(25) aDecay constant λ:4.809514158756 × 10-12 s-1Specific activity α:17878747982.648 Bq g-1
0.48320940493643 Ci g-1Spin and parity:
(nuclear angular momentum)7/2-Magnetic dipole moment:μ(μN) = 4.22(4)Quadrupole moment Q:3.6(6) barn (100 fm2)Nuclear g-factor:gl = 1.2057142857143Charge radius:5.1907(313) femtometer fmYear of discovery:1957
Radioactive Decay
Half-life T½ = 4570(25) a respectively 1.4412 × 1011 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC | 163Dy | 100 % | 2.56 MeV | |
Parent Nuclides
Direct parent isotope is: 163Er.
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 |
|---|
| 163mHo | 297.88(7) keV | 1.09(3) s | 1/2+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 96) and isobaric (same nucleon number A = 163) with Holmium-163. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 96 | Isobar A = 163 |
|---|
| 55 | 151Cs | |
| 56 | 152Ba | |
| 57 | 153La | |
| 58 | 154Ce | |
| 59 | 155Pr | |
| 60 | 156Nd | 163Nd |
| 61 | 157Pm | 163Pm |
| 62 | 158Sm | 163Sm |
| 63 | 159Eu | 163Eu |
| 64 | 160Gd | 163Gd |
| 65 | 161Tb | 163Tb |
| 66 | 162Dy | 163Dy |
| 67 | 163Ho | 163Ho |
| 68 | 164Er | 163Er |
| 69 | 165Tm | 163Tm |
| 70 | 166Yb | 163Yb |
| 71 | 167Lu | 163Lu |
| 72 | 168Hf | 163Hf |
| 73 | 169Ta | 163Ta |
| 74 | 170W | 163W |
| 75 | 171Re | 163Re |
| 76 | 172Os | 163Os |
| 77 | 173Ir | |
| 78 | 174Pt | |
| 79 | 175Au | |
| 80 | 176Hg | |
| 81 | 177Tl | |
| 82 | 178Pb | |
External data and identifiers
Last update: 2020-10-09
Perma link: https://www.chemlin.org/isotope/holmium-163
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