Level energy(keV)   Spin & Parity       
       ground state      3/2-                  
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)
     231.035884243 ± 0.000002395 (amu)  [mass excess = 33425.957 ± 2.232 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
     -381.556 ± 2.034 (keV) 
Strong Gamma-rays from Decay of Pa-231 (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 
         27.36           10.29       Alpha
        283.69            1.7        Alpha
        300.07            2.47       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            3.276E+4 Y 11    
Cross Sections (taken from JENDL-4.0)
     Table of cross sections, Pa-231.
     Figures of cross sections, Pa-231:  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
     Pa-230 (Z= 91, A=230), MT=102 (n,γ)
     Pa-231 (Z= 91, A=231), MT=  2 (Elastic scattering)
     Pa-231 (Z= 91, A=231), MT=  4 (Inelastic scattering)
     Pa-232 (Z= 91, A=232), MT= 16 (n,2n)
     Pa-233 (Z= 91, A=233), MT= 17 (n,3n)