Dysprosium-149
Properties and data of the isotope 149Dy.
See also: List of individual Dysprosium isotopes (and general data sources).
General data
Name of the isotope:Dysprosium-149; Dy-149Symbol:149Dy or 14966DyMass number A:149 (= number of nucleons)Atomic number Z:66 (= number of protons)Neutrons N:83Isotopic mass:148.927325(10) u (atomic weight of Dysprosium-149)Nuclide mass:148.8911218 u (calculated nuclear mass without electrons)Mass excess:-67.69633 MeVMass defect:1.30831514 u (per nucleus)Nuclear binding energy:1218.68770302 MeV (per nucleus)
8.1791121 MeV (average binding energy per nucleon)Separation energy:SN = 7.908(12) MeV (first neutron)
SP = 4.448(15) MeV (first proton)Half-life:4.20(14) minDecay constant λ:0.0027505840498411 s-1Specific activity α:1.119216526705 × 10+19 Bq g-1
302490953.16359 Ci g-1Spin and parity:
(nuclear angular momentum)(7/2-)Magnetic dipole moment:μ(μN) = -0.119(7)Quadrupole moment Q:-0.62(5) barn (100 fm2)Nuclear g-factor:gl = -0.034Charge radius:5.0567 femtometer fmYear of discovery:1958
Radioactive Decay
Half-life T½ = 4.20(14) min (minutes) respectively 2.52 × 102 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 149Tb | 100 % | 3.793(10) | |
Parent Nuclides
Direct parent isotopes are: 149Ho, 153Er.
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 |
|---|
| 149mDy | 2661.1(4) | 0.490(15) s | (27/2-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 83) and isobaric (same nucleon number A = 149) with Dysprosium-149. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 83 | Isobar A = 149 |
|---|
| 46 | 129Pd | |
| 47 | 130Ag | |
| 48 | 131Cd | |
| 49 | 132In | |
| 50 | 133Sn | |
| 51 | 134Sb | |
| 52 | 135Te | |
| 53 | 136I | |
| 54 | 137Xe | |
| 55 | 138Cs | 149Cs |
| 56 | 139Ba | 149Ba |
| 57 | 140La | 149La |
| 58 | 141Ce | 149Ce |
| 59 | 142Pr | 149Pr |
| 60 | 143Nd | 149Nd |
| 61 | 144Pm | 149Pm |
| 62 | 145Sm | 149Sm |
| 63 | 146Eu | 149Eu |
| 64 | 147Gd | 149Gd |
| 65 | 148Tb | 149Tb |
| 66 | 149Dy | 149Dy |
| 67 | 150Ho | 149Ho |
| 68 | 151Er | 149Er |
| 69 | 152Tm | 149Tm |
| 70 | 153Yb | 149Yb |
| 71 | 154Lu | 149Lu |
| 72 | 155Hf | |
| 73 | 156Ta | |
| 74 | 157W | |
External data and identifiers
Last update: 2020-10-08
Perma link: https://www.chemlin.org/isotope/dysprosium-149
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