55-Cs-138



Spin
     Level energy(keV)   Spin & Parity       
     ----------------------------------------
       ground state      3-                    
       7.99000E+01       6-                    
Mass (The Ame2012 atomic mass evaluation (II) by M.Wang, G.Audi, A.H.Wapstra, F.G.Kondev, M.MacCormick, X.Xu, and B.Pfeiffer Chinese Physics C36 p. 1603-2014, December 2012)
     137.911017089 ± 0.000009832 (amu)  [mass excess = -82887.048 ± 9.159 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
     5374.808 ± 9.159 (keV) 
Strong Gamma-rays from Decay of Cs-138 (Compiled from ENSDF as of March 2011)
  [ Intensities before May 23th of 2013 were values when total intensity of the decay mode was 100(%) and a branching ratio of each decay mode was not multiplied. ]
   γ-ray energy(keV)  Intensity(%)  Decay mode 
  ----------------------------------------------------------
        462.80           30.75         B- 
       1009.78           29.83         B- 
       1435.86           76.3          B- 
  ----------------------------------------------------------
         79.9             0.37         IT 
        191.7            15.39         B- 
        463.0            18.62         B- 
       1436.0            19.           B- 
  ----------------------------------------------------------
     *: relative, ~ approximate, ? calculated or estimatted 
     >: greater than or equal to, <: less than or equal to  
  [ Intensities; total intensity of the nuclide is 100(%). ]
Decay data(Chart of the Nuclides 2014)
     Decay mode     Half-life 
       B-           2.91 M 8         
       B-           33.41 M 18       
       IT           2.91 M 10        
Evaluated Data Libraries
     Links to the libraries. 

Parent Nuclides by Reactions in JENDL-4.0
     Cs-137 (Z= 55, A=137), MT=102 (n,γ)
     Ba-138 (Z= 56, A=138), MT=103 (n,p)
     Ba-140 (Z= 56, A=140), MT= 32 (n,nd)
     Ba-140 (Z= 56, A=140), MT=105 (n,t)
     La-140 (Z= 57, A=140), MT=106 (n,3He)

Fission Yields for Fission Products in JENDL-4.0 Fission Yield Data

   - Neutron-induced Fission Yields (from main actinide nuclides) - Independent Fission Yield -
     Product  Nuclide  Energy   Fission Yield  Uncertainty(1σ)
    -----------------------------------------------------------
     Cs-138    U-235   Thermal   1.924000e-03   2.116400e-04 
     Cs-138    U-235   Fast      2.496930e-03   5.742920e-04 
     Cs-138    U-235   High      3.451280e-03   2.208820e-03 
     Cs-138    U-238   Fast      2.257260e-04   1.444650e-04 
     Cs-138    U-238   High      9.037660e-04   9.941410e-05 
     Cs-138   Pu-239   Thermal   3.720840e-03   5.953350e-04 
     Cs-138   Pu-239   Fast      5.106260e-03   8.169970e-04 
     Cs-138   Pu-239   High      5.222860e-03   2.350280e-03 
     Cs-138   Pu-241   Thermal   1.419880e-03   3.265720e-04 
     Cs-138   Pu-241   Fast      1.221350e-03   7.816670e-04 
    -----------------------------------------------------------
     Cs-138m   U-235   Thermal   2.734600e-03   3.008070e-04 
     Cs-138m   U-235   Fast      4.179350e-03   2.674780e-03 
     Cs-138m   U-235   High      9.874130e-03   6.319440e-03 
     Cs-138m   U-238   Fast      3.778190e-04   2.418050e-04 
     Cs-138m   U-238   High      2.585680e-03   1.654830e-03 
     Cs-138m  Pu-239   Thermal   5.288450e-03   3.384610e-03 
     Cs-138m  Pu-239   Fast      8.546830e-03   5.469970e-03 
     Cs-138m  Pu-239   High      1.494260e-02   4.781620e-03 
     Cs-138m  Pu-241   Thermal   2.018090e-03   1.291580e-03 
     Cs-138m  Pu-241   Fast      2.044290e-03   1.308350e-03 
    -----------------------------------------------------------
    Thermal=0.0253eV, Fast=500keV(Fast reactor spectrum), High=14MeV
   - Neutron-induced Fission Yields (from main actinide nuclides) - Cumulative Fission Yield -
     Product  Nuclide  Energy   Fission Yield  Uncertainty(1σ)
    -----------------------------------------------------------
     Cs-138    U-235   Thermal   6.700010e-02   6.336930e-04 
     Cs-138    U-235   Fast      6.583760e-02   2.541740e-03 
     Cs-138    U-235   High      4.312090e-02   7.101420e-03 
     Cs-138    U-238   Fast      5.751180e-02   1.609710e-03 
     Cs-138    U-238   High      4.832510e-02   2.064830e-03 
     Cs-138   Pu-239   Thermal   5.969180e-02   3.597250e-03 
     Cs-138   Pu-239   Fast      5.913190e-02   4.922410e-03 
     Cs-138   Pu-239   High      3.549110e-02   5.689970e-03 
     Cs-138   Pu-241   Thermal   6.562140e-02   2.628820e-03 
     Cs-138   Pu-241   Fast      6.098470e-02   6.678130e-03 
    -----------------------------------------------------------
     Cs-138m   U-235   Thermal   2.734600e-03   3.012930e-04 
     Cs-138m   U-235   Fast      4.179350e-03   2.674780e-03 
     Cs-138m   U-235   High      9.874130e-03   6.310080e-03 
     Cs-138m   U-238   Fast      3.778190e-04   2.417160e-04 
     Cs-138m   U-238   High      2.585680e-03   1.653040e-03 
     Cs-138m  Pu-239   Thermal   5.288450e-03   3.384610e-03 
     Cs-138m  Pu-239   Fast      8.546830e-03   5.469970e-03 
     Cs-138m  Pu-239   High      1.494260e-02   4.778530e-03 
     Cs-138m  Pu-241   Thermal   2.018090e-03   1.291370e-03 
     Cs-138m  Pu-241   Fast      2.044290e-03   1.308350e-03 
    -----------------------------------------------------------
    Thermal=0.0253eV, Fast=500keV(Fast reactor spectrum), High=14MeV
      → Neutron-induced and Spontaneous Fission Yields of all nuclides in JENDL-4.0 Fission Yield Data