Level energy(keV)   Spin & Parity       
       ground state      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)
     238.050946611 ± 0.000001942 (amu)  [mass excess = 47456.463 ± 1.809 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
     1291.516 ± 0.446 (keV) 
Strong Gamma-rays from Decay of Np-238 (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 
        984.45           25.19         B- 
       1025.87            8.72         B- 
       1028.54           18.29         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-           2.117 D 2        
Cross Sections (taken from JENDL-4.0)
     Table of cross sections, Np-238.
     Figures of cross sections, Np-238:  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
     Np-237 (Z= 93, A=237), MT=102 (n,γ)
     Np-238 (Z= 93, A=238), MT=  2 (Elastic scattering)
     Np-238 (Z= 93, A=238), MT=  4 (Inelastic scattering)
     Np-239 (Z= 93, A=239), MT= 16 (n,2n)