93-Np-240



Spin
     Level energy(keV)   Spin & Parity       
     ----------------------------------------
       ground state      (5+)                  
       ground state(+X)  (1+)                  
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)
     240.056165427 ± 0.000018428 (amu)  [mass excess = 52317.758 ± 17.166 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
     2190.573 ± 17.075 (keV) 
Strong Gamma-rays from Decay of Np-240 (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 
  ----------------------------------------------------------
        554.60           20.87         B- 
        597.40           11.69         B- 
       1496.9             1.33         B- 
  ----------------------------------------------------------
        566.34           27.6          B- 
        600.57           20.           B- 
        973.9            25.9          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-           61.9 M 2         
       B-           7.22 M 2         
Evaluated Data Libraries
     Links to the libraries. 

Parent Nuclides by Reactions in JENDL-4.0
     Np-239 (Z= 93, A=239), MT=102 (n,γ)