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Gadolinium-159

Properties and data of the isotope 159Gd.


Contents

See also: list of Gadolinium isotopes.

 

General data

Name of the isotope:Gadolinium-159; Gd-159Symbol:159Gd or 15964GdMass number A:159 (= number of nucleons)Atomic number Z:64 (= number of protons)Neutrons N:95Isotopic mass:158.9263963(13) u (atomic weight of Gadolinium-159)Nuclide mass:158.89129 u (calculated nuclear mass without electrons)Mass excess:-68.5614 MeVMass defect:1.397572768 u (per nucleus)Nuclear binding energy:1301.83064796 MeV (per nucleus)
8.18761414 MeV (average binding energy per nucleon)
Separation energy:SN = 5.94321(8) MeV (first neutron)
SP = 8.595(10) MeV (first proton)
Half-life:18.479(4) hDecay constant λ:1.041950545006 × 10-5 s-1Specific activity α:3.971375285516 × 10+16 Bq g-1
1073344.6717611 Ci g-1
Spin and parity:
(nuclear angular momentum)
3/2-Magnetic dipole moment:μ(μN) = - 0.44(3)Nuclear g-factor:gl = -0.29333333333333Year of discovery:1949

 

Radioactive Decay

Half-life T½ = 18.479(4) h (hours) respectively 6.6524 × 104 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
β-159Tb100 %0.9709(8) MeV

 

Parent Nuclides

Direct parent isotope is: 159Eu.

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
159mGd67.829(24) keV26.2(8) ns5/2+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 95) and isobaric (same nucleon number A = 159) with Gadolinium-159. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 95Isobar A = 159
55150Cs
56151Ba
57152La
58153Ce
59154Pr159Pr
60155Nd159Nd
61156Pm159Pm
62157Sm159Sm
63158Eu159Eu
64159Gd159Gd
65160Tb159Tb
66161Dy159Dy
67162Ho159Ho
68163Er159Er
69164Tm159Tm
70165Yb159Yb
71166Lu159Lu
72167Hf159Hf
73168Ta159Ta
74169W159W
75170Re159Re
76171Os
77172Ir
78173Pt
79174Au
80175Hg
81176Tl

 

External data and identifiers

Adopted Levels, Gammas:NuDat 159Gd

 


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Last update: 2020-10-20


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