Dysprosium-165
Properties and data of the isotope 165Dy.
See also: List of individual Dysprosium isotopes (and general data sources).
General data
Name of the isotope:Dysprosium-165; Dy-165Symbol:165Dy or 16566DyMass number A:165 (= number of nucleons)Atomic number Z:66 (= number of protons)Neutrons N:99Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.5 (= neutron-proton ratio)Neutron excess (N-Z):33Isotopic mass:164.9317094(7) u (atomic weight of Dysprosium-165)Nuclide mass:164.8955062 u (calculated nuclear mass without electrons)Mass excess:-63.61228 MeVMass defect:1.442569396 u (per nucleus)Nuclear binding energy:1343.74473696 MeV (per nucleus)
8.1439075 MeV (average binding energy per nucleon)Separation energy:SN = 5.71596(5) MeV (first neutron)
SP = 8.7963(20) MeV (first proton)Half-life:2.332(4) hDecay constant λ:8.664339756999 × 10-5 s-1Specific activity α:3.181577711890 × 10+17 Bq g-1
8598858.6807843 Ci g-1Spin and parity:
(nuclear angular momentum)7/2+Magnetic dipole moment:μ(μN) = - 0.520(5)Quadrupole moment Q:3.49(7) barn (100 fm2)Nuclear g-factor:gl = -0.14857142857143Year of discovery:1935
Radioactive Decay
Half-life T½ = 2.332(4) h (hours) respectively 8..3952 × 103 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 165Ho | 100 % | 1.2857(8) MeV | |
Parent Nuclides
Direct parent isotope is: 165Tb.
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 |
|---|
| 165mDy | 108.1552(13) keV | 1.257(6) min | 1/2- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 99) and isobaric (same nucleon number A = 165) with Dysprosium-165. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 99 | Isobar A = 165 |
|---|
| 56 | 155Ba | |
| 57 | 156La | |
| 58 | 157Ce | |
| 59 | 158Pr | |
| 60 | 159Nd | |
| 61 | 160Pm | |
| 62 | 161Sm | 165Sm |
| 63 | 162Eu | 165Eu |
| 64 | 163Gd | 165Gd |
| 65 | 164Tb | 165Tb |
| 66 | 165Dy | 165Dy |
| 67 | 166Ho | 165Ho |
| 68 | 167Er | 165Er |
| 69 | 168Tm | 165Tm |
| 70 | 169Yb | 165Yb |
| 71 | 170Lu | 165Lu |
| 72 | 171Hf | 165Hf |
| 73 | 172Ta | 165Ta |
| 74 | 173W | 165W |
| 75 | 174Re | 165Re |
| 76 | 175Os | 165Os |
| 77 | 176Ir | 165Ir |
| 78 | 177Pt | 165Pt |
| 79 | 178Au | |
| 80 | 179Hg | |
| 81 | 180Tl | |
| 82 | 181Pb | |
External data and identifiers
CAS:13967-64-1InChI Key:KBQHZAAAGSGFKK-NJFSPNSNSA-NSMILES:[165Dy]PubChem:ID 166954Adopted Levels, Gammas:NuDat 165Dy
Last update: 2023-05-24
Perma link: https://www.chemlin.org/isotope/dysprosium-165
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