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)
294.213921 ± 0.000713 (amu) [mass excess = 199266 ± 664 (keV) ] [These values were derived from systematical trend]Evaluated Data Libraries
Links to the libraries.