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Europium-154

Properties and data of the isotope 154Eu.


Contents

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-1
Spin 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
DaughterProbabilityDecay energyγ energy
(intensity)
EC/β+154Sm0.018(12) %0.717(20) MeV
β-154Gd99.982(12) %1.9678(8) MeV

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
154m1Eu68.1702(4) keV2.2(1) μs2+
154m2Eu145.3(3) keV46.3(4) min8-

 

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.

 

ZIsotone N = 91Isobar A = 154
52143Te
53144I
54145Xe
55146Cs
56147Ba
57148La154La
58149Ce154Ce
59150Pr154Pr
60151Nd154Nd
61152Pm154Pm
62153Sm154Sm
63154Eu154Eu
64155Gd154Gd
65156Tb154Tb
66157Dy154Dy
67158Ho154Ho
68159Er154Er
69160Tm154Tm
70161Yb154Yb
71162Lu154Lu
72163Hf154Hf
73164Ta
74165W
75166Re
76167Os
77168Ir
78169Pt
79170Au
80171Hg

 

External data and identifiers

Adopted Levels, Gammas:NuDat 154Eu

 


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Last update: 2020-10-20


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