19-K-40



Spin
     Level energy(keV)   Spin & Parity       
     ----------------------------------------
       ground state      4-                    
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)
     39.963998166 ± 0.000000060 (amu)  [mass excess = -33535.492 ± 0.056 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
     1310.894 ± 0.060 (keV) 
Strong Gamma-rays from Decay of K- 40 (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 
  ----------------------------------------------------------
       1460.82           10.66         EC 
  ----------------------------------------------------------
     *: 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-           1.248E+9 Y 3     
       EC           1.248E+9 Y 3     
Cross Sections (taken from JENDL-4.0)
     Table of cross sections, K-40.
     Figures of cross sections, K-40:  type-1:  type-2:  type-3.
       type-1: total, elastic and inelastic scattering, capture and fision cross sections
       type-2: same as type-1 but cross sections are averaged in 70 energy group intervals
       type-3: threshold reaction cross sections
Evaluated Data Libraries
     Links to the libraries. 

Parent Nuclides by Reactions in JENDL-4.0
     K - 39 (Z= 19, A= 39), MT=102 (n,γ)
     K - 40 (Z= 19, A= 40), MT=  2 (Elastic scattering)
     K - 40 (Z= 19, A= 40), MT=  4 (Inelastic scattering)
     K - 41 (Z= 19, A= 41), MT= 16 (n,2n)
     Ca- 40 (Z= 20, A= 40), MT=103 (n,p)