55-Cs-137
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)
136.907089231 ± 0.000000355 (amu) [mass excess = -86545.824 ± 0.331 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
1175.629 ± 0.172 (keV)
Strong Gamma-rays from Decay of Cs-137 (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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283.5 6.E-04 B-
661.66 85.1 B-
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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
B- 30.08 Y 9
Cross Sections (taken from JENDL-4.0)
Table of cross sections, Cs-137.
Figures of cross sections, Cs-137: 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
Cs-136 (Z= 55, A=136), MT=102 (n,γ)
Cs-137 (Z= 55, A=137), MT= 2 (Elastic scattering)
Cs-137 (Z= 55, A=137), MT= 4 (Inelastic scattering)
Ba-137 (Z= 56, A=137), MT=103 (n,p)
Ba-138 (Z= 56, A=138), MT= 28 (n,np)
Ba-138 (Z= 56, A=138), MT=104 (n,d)
Ba-140 (Z= 56, A=140), MT= 33 (n,nt)
La-139 (Z= 57, A=139), MT=106 (n,3He)
La-140 (Z= 57, A=140), MT=107 (n,α)
Fission Yields for Fission Products in JENDL-4.0 Fission Yield Data
- Neutron-induced Fission Yields (from main actinide nuclides) - Independent Fission Yield -
Product Nuclide Energy Fission Yield Uncertainty(1σ)
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Cs-137 U-235 Thermal 5.990760e-04 6.589830e-05
Cs-137 U-235 Fast 2.278840e-03 7.292270e-04
Cs-137 U-235 High 9.489290e-03 3.036580e-03
Cs-137 U-238 Fast 1.121620e-04 7.178360e-05
Cs-137 U-238 High 4.216020e-03 1.897210e-03
Cs-137 Pu-239 Thermal 5.972290e-03 9.555660e-04
Cs-137 Pu-239 Fast 1.004280e-02 1.606860e-03
Cs-137 Pu-239 High 1.613370e-02 3.710740e-03
Cs-137 Pu-241 Thermal 9.238090e-04 5.912380e-04
Cs-137 Pu-241 Fast 8.695460e-04 5.565100e-04
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Thermal=0.0253eV, Fast=500keV(Fast reactor spectrum), High=14MeV
- Neutron-induced Fission Yields (from main actinide nuclides) - Cumulative Fission Yield -
Product Nuclide Energy Fission Yield Uncertainty(1σ)
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Cs-137 U-235 Thermal 6.175280e-02 3.357540e-04
Cs-137 U-235 Fast 6.206820e-02 3.436130e-04
Cs-137 U-235 High 4.932800e-02 2.956630e-03
Cs-137 U-238 Fast 6.050970e-02 6.054580e-04
Cs-137 U-238 High 5.150220e-02 1.441500e-03
Cs-137 Pu-239 Thermal 6.604780e-02 3.313970e-04
Cs-137 Pu-239 Fast 6.582260e-02 4.615150e-04
Cs-137 Pu-239 High 4.454610e-02 3.562060e-03
Cs-137 Pu-241 Thermal 6.648990e-02 4.658530e-04
Cs-137 Pu-241 Fast 6.378670e-02 3.832770e-03
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Thermal=0.0253eV, Fast=500keV(Fast reactor spectrum), High=14MeV
→ Neutron-induced and Spontaneous Fission Yields of all nuclides in JENDL-4.0 Fission Yield Data