Periodic Table of Elements

La - Lanthanum

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Nuclides / Isotopes

Nuc-
lide
Atomic
Mass
NNAbun
%
SpinHalf LifeDMDTBR
%
Decay
Energy
(MeV)
La117116.9560Syn      
La118117.94761Syn      
La119118.94162Syn      
La120119.93863Syn 2.8sεBa120 11.200
 2.8sε + PCs119 7.400
La121120.93364Syn 5.3sεBa121 7.900
La122121.93165Syn 8.7sεBa122 9.700
 8.7sε + PCs121 5.300
La123122.92666Syn 17sεBa123 6.900
La124123.92567Syn 29sεBa124 8.800
La125124.92168Syn11/2-76sεBa125 5.600
La126125.91969Syn 54sεBa126>07.600
La127126.91670Syn11/2-5.1mεBa127 4.690
meta state 0.014MeVSyn3/2+3.7mεBa127 4.705
 3.7mIT  0.015
La128127.91571Syn5+5mεBa128 6.700
La129128.912772Syn3/2+11.6mεBa129 3.720
meta state 0.172MeVSyn11/2-0.56sIT  0.172
La130129.91273Syn3+8.7mεBa130 5.600
La131130.9174Syn3/2+59mεBa131 2.960
La132131.910175Syn2-4.8hεBa132 4.710
meta state 0.188MeVSyn6-24.3mIT 760.188
 24.3mεBa132244.898
La133132.90876Syn5/2+3.912hεBa133 2.230
La134133.908577Syn1+6.45mεBa134 3.710
La135134.90778Syn5/2+19.5hεBa135 1.200
La136135.907779Syn1+9.87mεBa136 2.870
meta state 0.230MeVSyn 114msIT  0.230
La137136.906580Syn7/2+60000yεBa137 0.600
La138137.9071810.095+1.05E 11yεBa13866.41.737
 1.05E 11yβ-Ce13833.61.044
La139138.90648299.917/2+Stable 
La140139.909583Syn3-1.6781dβ-Ce140 3.762
La141140.91184Syn7/2+3.92hβ-Ce141 2.502
La142141.914185Syn2-91.1mβ-Ce142 4.505
La143142.916186Syn7/2+14.2mβ-Ce143 3.425
La144143.919687Syn3-40.8sβ-Ce144 5.540
La145144.921688Syn5/2+24.8sβ-Ce145 4.120
La146145.925789Syn2-6.27sβ-Ce146 6.550
meta state 0.000MeVSyn6-10sβ-Ce146 6.550
La147146.927890Syn2+, 5/2+4.015sβ- + NCe1460.040.400
 4.015sβ-Ce147 4.950
La148147.93291Syn2-1.05sβ- + NCe1470.150.950
 1.05sβ-Ce148 7.260
La149148.93492Syn 1.05sβ- + NCe1481.41.100
 1.05sβ-Ce149 5.500
La150149.93993Syn 0.86sβ- + NCe1492.71.500
 0.86sβ-Ce150 7.800
La151150.94294Syn      
La152151.94695Syn >150nsβ-Ce152 9.100
La153152.94996Syn >150ns    
La154153.95497Syn      
La155154.95898Syn      
NuclidePotential Parent Nuclides
La117None known
La118None known
La119None known
La120None known
La121None known
La122None known
La123Ce123 (Syn) Pr124 (Syn)
La124Ce124 (Syn)
La125Ce125 (Syn) Pr126 (Syn)
La126Ce126 (Syn)
La127Ce127 (Syn) Pr128 (Syn)
meta state 0.014MeVNone known
La128Ce128 (Syn)
La129Ce129 (Syn)
meta state 0.172MeVNone known
La130Ce130 (Syn)
La131Ce131 (Syn) Ce131m (Syn)
La132Ce132 (Syn)
meta state 0.188MeVNone known
La133Ce133 (Syn) Ce133m (Syn)
La134Ce134 (Syn)
La135Ce135 (Syn)
La136None known
meta state 0.230MeVNone known
La137Ce137 (Syn) Ce137m (Syn)
La138None known
La139Ba139 (Syn) Ce139 (Syn)
La140Ba140 (Syn)
La141Ba141 (Syn)
La142Ba142 (Syn)
La143Ba143 (Syn) Ba144 (Syn)
La144Ba144 (Syn)
La145Ba145 (Syn)
La146Ba146 (Syn) Ba147 (Syn)
meta state 0.000MeVNone known
La147Ba147 (Syn) Ba148 (Syn)
La148Ba148 (Syn) Ba149 (Syn)
La149Ba149 (Syn)
La150Ba150 (Syn)
La151None known
La152None known
La153None known
La154None known
La155None 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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