55-Cs-121
Spin
Level energy(keV) Spin & Parity
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ground state 3/2(+)
6.85000E+01 9/2(+)
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)
120.917227238 ± 0.000015340 (amu) [mass excess = -77102.331 ± 14.290 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
-6357.495 ± 141.176 (keV)
Strong Gamma-rays from Decay of Cs-121 (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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179.4 30.21 EC
196.0 24.13 EC
459.7 11.99 EC
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153.9 15.02 EC
239.6 7.66 EC
427.1 3.6 EC
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68.5 -- IT
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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
EC 122 S 3
EC 155 S 4
IT 122 S 3
Evaluated Data Libraries
Links to the libraries.
Parent Nuclides by Reactions in JENDL-4.0