Level energy(keV)   Spin & Parity       
       ground state      5/2+                  
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)
     241.056851661 ± 0.000001921 (amu)  [mass excess = 52956.981 ± 1.790 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
     20.783 ± 0.128 (keV) 
Strong Gamma-rays from Decay of Pu-241 (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 
        103.68          1.E-04       Alpha
        114.0           8.E-05       Alpha
        148.57          2.E-04       Alpha
     *: 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 
       A            14.290 Y 6       
       B-           14.290 Y 6       
Cross Sections (taken from JENDL-4.0)
     Table of cross sections, Pu-241.
     Figures of cross sections, Pu-241:  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
     Pu-240 (Z= 94, A=240), MT=102 (n,γ)
     Pu-241 (Z= 94, A=241), MT=  2 (Elastic scattering)
     Pu-241 (Z= 94, A=241), MT=  4 (Inelastic scattering)
     Pu-242 (Z= 94, A=242), MT= 16 (n,2n)
     Pu-244 (Z= 94, A=244), MT= 37 (n,4n)