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Dysprosium-159

Properties and data of the isotope 159Dy.


Contents

See also: list of Dysprosium isotopes.

 

General data

Name of the isotope:Dysprosium-159; Dy-159Symbol:159Dy or 15966DyMass number A:159 (= number of nucleons)Atomic number Z:66 (= number of protons)Neutrons N:93Isotopic mass:158.9257460(16) u (atomic weight of Dysprosium-159)Nuclide mass:158.8895428 u (calculated nuclear mass without electrons)Mass excess:-69.16716 MeVMass defect:1.3965433 u (per nucleus)Nuclear binding energy:1300.87170469 MeV (per nucleus)
8.18158305 MeV (average binding energy per nucleon)
Separation energy:SN = 6.8311(26) MeV (first neutron)
SP = 6.9854(13) MeV (first proton)
Half-life:144.4(2) dDecay constant λ:5.555773415537 × 10-8 s-1Specific activity α:2.117572790775 × 10+14 Bq g-1
5723.1697047997 Ci g-1
Spin and parity:
(nuclear angular momentum)
3/2-Magnetic dipole moment:μ(μN) = - 0.354(3)Quadrupole moment Q:+ 1.37(2) barn (100 fm2)Nuclear g-factor:gl = -0.236Charge radius:5.1825(3031) femtometer fmYear of discovery:1951

 

Radioactive Decay

Half-life T½ = 144.4(2) d respectively 1.2476160 × 107 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
EC159Tb100 %0.3652(20) MeV

 

Parent Nuclides

Direct parent isotope is: 159Ho.

 

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear IsomerExcitation EnergyHalf-lifeSpin
159mDy352.77(14) keV122(3) μs11/2-

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 93) and isobaric (same nucleon number A = 159) with Dysprosium-159. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 93Isobar A = 159
54147Xe
55148Cs
56149Ba
57150La
58151Ce
59152Pr159Pr
60153Nd159Nd
61154Pm159Pm
62155Sm159Sm
63156Eu159Eu
64157Gd159Gd
65158Tb159Tb
66159Dy159Dy
67160Ho159Ho
68161Er159Er
69162Tm159Tm
70163Yb159Yb
71164Lu159Lu
72165Hf159Hf
73166Ta159Ta
74167W159W
75168Re159Re
76169Os
77170Ir
78171Pt
79172Au
80173Hg

 

External data and identifiers

Adopted Levels, Gammas:NuDat 159Dy

 


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Last update: 2020-10-08


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