99-Es-254
Spin
Level energy(keV) Spin & Parity
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ground state (7+)
8.42000E+01 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)
254.088022199 ± 0.000004540 (amu) [mass excess = 81992.151 ± 4.229 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
1087.800 ± 3.202 (keV)
Strong Gamma-rays from Decay of Es-254 (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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63. 2. Alpha
304. 0.07 Alpha
316. 0.15 Alpha
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648.69 28.42 B-
688.52 12.25 B-
693.67 24.3 B-
71.30 0.04 Alpha
177.3 0.05 Alpha
211.8 0.09 Alpha
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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 39.3 H 2
A 275.7 D 5
B- 39.3 H 2
Cross Sections (taken from JENDL-4.0)
Table of cross sections, Es-254, 254M.
Figures of cross sections, Es-254: type-1: type-2: type-3.
Es-254M: 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
Es-253 (Z= 99, A=253), MT=102 (n,γ)
Es-254 (Z= 99, A=254), MT= 2 (Elastic scattering)
Es-254 (Z= 99, A=254), MT= 2 (Elastic scattering)
Es-254 (Z= 99, A=254), MT= 4 (Inelastic scattering)
Es-254 (Z= 99, A=254), MT= 4 (Inelastic scattering)
Es-255 (Z= 99, A=255), MT= 16 (n,2n)