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Periodic Table of Elements

Sm - Samarium

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Nuclides / Isotopes

Nuc-
lide		Atomic
Mass		NNAbun
%		SpinHalf LifeDMDTBR
%		Decay
Energy
(MeV)
Sm130129.94968Syn0+     
Sm131130.94669Syn 1.2s ε + PNd130>0 
 1.2s εPm131  
Sm132131.94170Syn0+4s εPm132  
 4s ε + PNd131  
Sm133132.93971Syn5/2+3.7s εPm133  
 3.7s ε + PNd132  
Sm134133.93472Syn0+10s εPm134 5.400
Sm135134.93273Syn7/2+10.3s ε + PNd1340.025.500
 10.3s εPm135 7.200
Sm136135.92874Syn0+47s εPm136 4.500
Sm137136.92775Syn9/2-45s εPm137 6.100
Sm138137.92476Syn0+3.1m εPm138 3.900
Sm139138.922377Syn1/2+2.57m εPm139 5.460
Sm140139.91978Syn0+14.82m εPm140 3.020
Sm141140.918579Syn1/2+10.2m εPm141 4.543
meta state 0.176MeVSyn11/2-22.6m εPm14199.694.719
 22.6mIT 0.310.176
Sm142141.915280Syn0+72.49m εPm142 2.090
Sm143142.914681Syn3/2+8.83m εPm143 3.443
meta state 0.754MeVSyn11/2-66sIT 99.760.754
 66s εPm1430.244.197
meta state 2.795MeVSyn23/2-30msIT  2.795
Sm144143.912823.10+Stable 
Sm145144.913483Syn7/2-340d εPm145 0.617
Sm146145.91384Syn0+1.03E 8yαNd142 2.529
Sm147146.91498515.7/2-1.06E 11yαNd143 2.310
Sm148147.91488611.30+7E 15yαNd144 1.986
Sm149148.91728713.87/2->2E 15yαNd145  
Sm150149.9173887.40+Stable 
Sm151150.919989Syn5/2-90y β-Eu151 0.077
Sm152151.91979026.70+Stable 
Sm153152.922191Syn3/2+46.284h β-Eu153 0.808
Sm154153.92229222.70+Stable 
Sm155154.924693Syn3/2-22.3m β-Eu155 1.627
Sm156155.925594Syn0+9.4h β-Eu156 0.722
Sm157156.928495Syn3/2-482s β-Eu157 2.730
Sm158157.9396Syn0+5.3m β-Eu158 1.999
Sm159158.93397Syn5/2-11.37s β-Eu159 3.800
Sm160159.93598Syn0+9.6s β-Eu160 3.000
Sm161160.93999Syn      
Sm162161.941100Syn0+     
Sm163162.945101Syn      
Sm164163.948102Syn0+     
Sm165164.953103Syn      
NuclidePotential Parent Nuclides
Sm130None known
Sm131None known
Sm132None known
Sm133None known
Sm134Eu134 (Syn)
Sm135Eu135 (Syn)
Sm136Eu136 (Syn) Eu136m (Syn)
Sm137Eu137 (Syn)
Sm138Eu138 (Syn) Gd139 (Syn)
Sm139Eu139 (Syn)
Sm140Eu140 (Syn) Eu140m (Syn) Gd141 (Syn)
Sm141Eu141 (Syn) Eu141m (Syn)
meta state 0.176MeVNone known
Sm142Eu142 (Syn) Eu142m (Syn)
Sm143Eu143 (Syn)
meta state 0.754MeVNone known
meta state 2.795MeVNone known
Sm144Eu144 (Syn) Gd148 (Syn)
Sm145Eu145 (Syn) Gd149 (Syn)
Sm146Eu146 (Syn) Gd150 (Syn) Pm146 (Syn)
Sm147Eu147 (Syn) Gd151 (Syn) Pm147 (Syn)
Sm148Eu148 (Syn) Gd152 (Natural) Pm148 (Syn) Pm148m (Syn)
Sm149Eu149 (Syn) Pm149 (Syn)
Sm150Eu150 (Syn) Eu150m (Syn) Nd150 (Natural) Pm150 (Syn)
Sm151Pm151 (Syn)
Sm152Eu152 (Syn) Eu152m (Syn) Pm152 (Syn) Pm152m (Syn)
Sm153Pm153 (Syn)
Sm154Eu154 (Syn) Pm154 (Syn) Pm154m (Syn)
Sm155Pm155 (Syn)
Sm156Pm156 (Syn)
Sm157Pm157 (Syn)
Sm158Pm158 (Syn)
Sm159None known
Sm160None known
Sm161None known
Sm162None known
Sm163None known
Sm164None known
Sm165None 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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