Gadolinium-159
Properties and data of the isotope 159Gd.
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-1Spin 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 | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 159Tb | 100 % | 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 Isomer | Excitation Energy | Half-life | Spin |
---|
159mGd | 67.829(24) keV | 26.2(8) ns | 5/2+ |
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.
Z | Isotone N = 95 | Isobar A = 159 |
55 | 150Cs | |
56 | 151Ba | |
57 | 152La | |
58 | 153Ce | |
59 | 154Pr | 159Pr |
60 | 155Nd | 159Nd |
61 | 156Pm | 159Pm |
62 | 157Sm | 159Sm |
63 | 158Eu | 159Eu |
64 | 159Gd | 159Gd |
65 | 160Tb | 159Tb |
66 | 161Dy | 159Dy |
67 | 162Ho | 159Ho |
68 | 163Er | 159Er |
69 | 164Tm | 159Tm |
70 | 165Yb | 159Yb |
71 | 166Lu | 159Lu |
72 | 167Hf | 159Hf |
73 | 168Ta | 159Ta |
74 | 169W | 159W |
75 | 170Re | 159Re |
76 | 171Os | |
77 | 172Ir | |
78 | 173Pt | |
79 | 174Au | |
80 | 175Hg | |
81 | 176Tl | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/gadolinium-159
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