Europium-154
Properties and data of the isotope 154Eu.
See also: list of Europium isotopes.
General data
Name of the isotope:Europium-154; Eu-154Symbol:154Eu or 15463EuMass number A:154 (= number of nucleons)Atomic number Z:63 (= number of protons)Neutrons N:91Isotopic mass:153.9229860(14) u (atomic weight of Europium-154)Nuclide mass:153.8884282 u (calculated nuclear mass without electrons)Mass excess:-71.73808 MeVMass defect:1.358498372 u (per nucleus)Nuclear binding energy:1265.43308253 MeV (per nucleus)
8.21709794 MeV (average binding energy per nucleon)Separation energy:SN = 6.44222(24) MeV (first neutron)
SP = 6.4674(7) MeV (first proton)Half-life:8.601(10) aDecay constant λ:2.555466100478 × 10-9 s-1Specific activity α:10058416222141 Bq g-1
271.84908708489 Ci g-1Spin and parity:
(nuclear angular momentum)3-Magnetic dipole moment:μ(μN) = - 2.005(6)Quadrupole moment Q:2.84(10) barn (100 fm2)Nuclear g-factor:gl = -0.66833333333333Charge radius:5.1239(79) femtometer fmYear of discovery:1947
Radioactive Decay
Half-life T½ = 8.601(10) a respectively 2.71241 × 108 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC/β+ | 154Sm | 0.018(12) % | 0.717(20) MeV | |
β- | 154Gd | 99.982(12) % | 1.9678(8) MeV | |
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 |
---|
154m1Eu | 68.1702(4) keV | 2.2(1) μs | 2+ |
154m2Eu | 145.3(3) keV | 46.3(4) min | 8- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 91) and isobaric (same nucleon number A = 154) with Europium-154. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 91 | Isobar A = 154 |
52 | 143Te | |
53 | 144I | |
54 | 145Xe | |
55 | 146Cs | |
56 | 147Ba | |
57 | 148La | 154La |
58 | 149Ce | 154Ce |
59 | 150Pr | 154Pr |
60 | 151Nd | 154Nd |
61 | 152Pm | 154Pm |
62 | 153Sm | 154Sm |
63 | 154Eu | 154Eu |
64 | 155Gd | 154Gd |
65 | 156Tb | 154Tb |
66 | 157Dy | 154Dy |
67 | 158Ho | 154Ho |
68 | 159Er | 154Er |
69 | 160Tm | 154Tm |
70 | 161Yb | 154Yb |
71 | 162Lu | 154Lu |
72 | 163Hf | 154Hf |
73 | 164Ta | |
74 | 165W | |
75 | 166Re | |
76 | 167Os | |
77 | 168Ir | |
78 | 169Pt | |
79 | 170Au | |
80 | 171Hg | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/europium-154
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