40-Zr-99



Spin
     Level energy(keV)   Spin & Parity       
     ----------------------------------------
       ground state      (1/2+)                
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)
     98.916666746 ± 0.000011358 (amu)  [mass excess = -77624.426 ± 10.580 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
     4707.369 ± 16.030 (keV) 
Strong Gamma-rays from Decay of Zr- 99 (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 
  ----------------------------------------------------------
        469.14           55.           B- 
        546.13           48.29         B- 
        593.99           27.23         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-           2.1 S 1          
Evaluated Data Libraries
     Links to the libraries. 

Parent Nuclides by Reactions in JENDL-4.0 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)
    -----------------------------------------------------------
     Zr- 99    U-235   Thermal   3.578500e-02   8.230540e-03 
     Zr- 99    U-235   Fast      3.356460e-02   1.074070e-02 
     Zr- 99    U-235   High      2.902570e-02   9.288220e-03 
     Zr- 99    U-238   Fast      1.471290e-02   4.708120e-03 
     Zr- 99    U-238   High      2.172480e-02   6.951910e-03 
     Zr- 99   Pu-239   Thermal   3.762610e-02   1.204040e-02 
     Zr- 99   Pu-239   Fast      4.001160e-02   1.280380e-02 
     Zr- 99   Pu-239   High      2.590390e-02   8.289240e-03 
     Zr- 99   Pu-241   Thermal   3.350080e-02   1.072020e-02 
     Zr- 99   Pu-241   Fast      2.896880e-02   9.270030e-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)
    -----------------------------------------------------------
     Zr- 99    U-235   Thermal   5.660060e-02   6.199910e-03 
     Zr- 99    U-235   Fast      5.822650e-02   9.267090e-03 
     Zr- 99    U-235   High      4.315520e-02   9.867830e-03 
     Zr- 99    U-238   Fast      6.226830e-02   6.810320e-03 
     Zr- 99    U-238   High      5.597360e-02   8.879120e-03 
     Zr- 99   Pu-239   Thermal   5.239100e-02   1.669830e-02 
     Zr- 99   Pu-239   Fast      5.310740e-02   1.216900e-02 
     Zr- 99   Pu-239   High      3.458150e-02   7.919460e-03 
     Zr- 99   Pu-241   Thermal   5.762650e-02   9.163490e-03 
     Zr- 99   Pu-241   Fast      5.398810e-02   8.582030e-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