Periodic Table of Elements

Eu - Europium

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Nuclides / Isotopes

Nuc-
lide
Atomic
Mass
NNAbun
%
SpinHalf LifeDMDTBR
%
Decay
Energy
(MeV)
Eu131 68Syn3/2+, 5/2+26msP   
Eu132131.95469Syn      
Eu133132.94970Syn      
Eu134133.94671Syn 0.5sε + PPm133>0 
 0.5sεSm134  
Eu135134.94272Syn 1.5sεSm135 8.700
 1.5sε + PPm134 5.00
Eu136135.9473Syn7+3.3sε + PPm1350.096.500
 3.3sεSm136 10.400
meta state 0.000MeVSyn3+3.7sε + PPm1350.096.500
 3.7sεSm136 10.400
Eu137136.93574Syn11/2-11sεSm137 7.500
Eu138137.93375Syn6-12.1sεSm138 9.200
Eu139138.9376Syn11/2-17.9sεSm139 6.700
Eu140139.928177Syn1+1.51sεSm140 8.400
meta state 0.185MeVSyn5-125msεSm140<18.585
 125msIT  0.185
Eu141140.924978Syn5/2+40.7sεSm141 5.550
meta state 0.096MeVSyn11/2-2.7sIT 870.096
 2.7sεSm141135.646
Eu142141.923479Syn1+2.34sεSm142 7.640
meta state 0.000MeVSyn8-1.22mεSm142 7.640
Eu143142.920380Syn5/2+2.63mεSm143 5.275
Eu144143.918881Syn1+10.2sεSm144 6.315
Eu145144.916382Syn5/2+5.93dεSm145 2.660
Eu146145.917283Syn4-4.61dεSm146 3.878
Eu147146.916784Syn5/2+24.1dαPm1430.00222.990
 24.1dεSm147 1.722
Eu148147.918285Syn5-54.5dαPm1449.4E -72.761
 54.5dεSm148 3.107
Eu149148.917986Syn5/2+93.1dεSm149 0.692
Eu150149.919787Syn5-36.9yεSm150 2.261
meta state 0.042MeVSyn0-12.8hβ-Gd150891.013
 12.8hεSm150112.303
 12.8hITEu150 0.042
Eu151150.91998847.85/2+Stable 
Eu152151.921789Syn3-13.537yεSm15272.11.874
 13.537yβ-Gd15227.91.819
meta state 0.045MeVSyn0-9.3116hβ-Gd152721.865
 9.3116hεSm152281.920
meta state 0.147MeVSyn8-96mIT  0.148
Eu153152.92129052.25/2+Stable 
Eu154153.92391Syn3-8.593yβ-Gd15499.981.969
 8.593yεSm1540.020.717
meta state 0.145MeVSyn8-46.3mIT  0.145
Eu155154.922992Syn5/2+4.7611yβ-Gd155 0.252
Eu156155.924893Syn0+15.19dβ-Gd156 2.451
Eu157156.925494Syn5/2+15.18hβ-Gd157 1.363
Eu158157.927895Syn1-45.9mβ-Gd158 3.490
Eu159158.929196Syn5/2+18.1mβ-Gd159 2.514
Eu160159.93297Syn1-38sβ-Gd160 4.580
Eu161160.93498Syn 26sβ-Gd161 3.700
Eu162161.93799Syn 10.6sβ-Gd162 5.600
Eu163162.939100Syn      
Eu164163.943101Syn      
Eu165164.946102Syn      
Eu166165.95103Syn      
Eu167166.953104Syn      
NuclidePotential Parent Nuclides
Eu131None known
Eu132None known
Eu133None known
Eu134None known
Eu135None known
Eu136None known
meta state 0.000MeVNone known
Eu137Gd137 (Syn)
Eu138None known
Eu139Gd139 (Syn) Tb140 (Syn)
Eu140Gd140 (Syn)
meta state 0.185MeVNone known
Eu141Gd141 (Syn) Gd141m (Syn) Tb142 (Syn) Tb142m (Syn)
meta state 0.096MeVNone known
Eu142Gd142 (Syn)
meta state 0.000MeVNone known
Eu143Gd143 (Syn) Gd143m (Syn)
Eu144Gd144 (Syn)
Eu145Gd145 (Syn) Gd145m (Syn) Tb149 (Syn) Tb149m (Syn)
Eu146Gd146 (Syn) Tb150 (Syn)
Eu147Gd147 (Syn) Tb151 (Syn)
Eu148Tb152 (Syn)
Eu149Gd149 (Syn)
Eu150Eu150m (Syn)
meta state 0.042MeVNone known
Eu151Gd151 (Syn) Sm151 (Syn)
Eu152None known
meta state 0.045MeVNone known
meta state 0.147MeVNone known
Eu153Gd153 (Syn) Sm153 (Syn)
Eu154None known
meta state 0.145MeVNone known
Eu155Sm155 (Syn)
Eu156Sm156 (Syn)
Eu157Sm157 (Syn)
Eu158Sm158 (Syn)
Eu159Sm159 (Syn)
Eu160Sm160 (Syn)
Eu161None known
Eu162None known
Eu163None known
Eu164None known
Eu165None known
Eu166None known
Eu167None known

Key:

  • NN = Number of Neutrons
  • Abun % = Natural Abundance (as a percentage)
  • Syn = Synthetic Nuclide (does not occur in nature)
  • DM = Decay Mode
    α = Alpha emission
    β- = Beta emission
    β- β- = Double beta decay
    β+ = Positron emission
    ε = Electron Capture
    IT = Isomeric Transition
    N = Neutron emission
    P = Proton emission
    SF = Spontaneous Fission
  • DT = Decays To
  • BR % = Branch Ratio (as a percentage)

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