99-Es-249
Spin
Level energy(keV) Spin & Parity
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ground state (7/2+)
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)
249.076411 ± 0.000032 (amu) [mass excess = 71177 ± 30 (keV) ]
[These values were derived from systematical trend]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
-2344 ± 31 (keV) [derived from systematical trend]
Strong Gamma-rays from Decay of Es-249 (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
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375.1 3.31 EC
379.5 40.77 EC
813.2 9.24 EC
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*: 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 102.2 M 6
EC 102.2 M 6
Evaluated Data Libraries
Links to the libraries.
Parent Nuclides by Reactions in JENDL-4.0
Es-251 (Z= 99, A=251), MT= 17 (n,3n)
Es-252 (Z= 99, A=252), MT= 37 (n,4n)