Level energy(keV)   Spin & Parity       
       ground state      0+                    
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)
     51.974800 ± 0.000750 (amu)  [mass excess = -23474 ± 699 (keV) ]
 	[These values were derived from systematical trend]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
     -20409 ± 1063 (keV) [derived from systematical trend] 
Decay data(Chart of the Nuclides 2014)
     Decay mode     Half-life 
       EC           38 MS 5          
Evaluated Data Libraries
     Links to the libraries. 

Parent Nuclides by Reactions in JENDL-4.0