55-Cs-138
Spin
Level energy(keV) Spin & Parity
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ground state 3-
7.99000E+01 6-
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)
137.911017089 ± 0.000009832 (amu) [mass excess = -82887.048 ± 9.159 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
5374.808 ± 9.159 (keV)
Strong Gamma-rays from Decay of Cs-138 (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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462.80 30.75 B-
1009.78 29.83 B-
1435.86 76.3 B-
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79.9 0.37 IT
191.7 15.39 B-
463.0 18.62 B-
1436.0 19. 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- 2.91 M 8
B- 33.41 M 18
IT 2.91 M 10
Evaluated Data Libraries
Links to the libraries.
Parent Nuclides by Reactions in JENDL-4.0
Cs-137 (Z= 55, A=137), MT=102 (n,γ)
Ba-138 (Z= 56, A=138), MT=103 (n,p)
Ba-140 (Z= 56, A=140), MT= 32 (n,nd)
Ba-140 (Z= 56, A=140), MT=105 (n,t)
La-140 (Z= 57, A=140), MT=106 (n,3He)
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-138 U-235 Thermal 1.924000e-03 2.116400e-04
Cs-138 U-235 Fast 2.496930e-03 5.742920e-04
Cs-138 U-235 High 3.451280e-03 2.208820e-03
Cs-138 U-238 Fast 2.257260e-04 1.444650e-04
Cs-138 U-238 High 9.037660e-04 9.941410e-05
Cs-138 Pu-239 Thermal 3.720840e-03 5.953350e-04
Cs-138 Pu-239 Fast 5.106260e-03 8.169970e-04
Cs-138 Pu-239 High 5.222860e-03 2.350280e-03
Cs-138 Pu-241 Thermal 1.419880e-03 3.265720e-04
Cs-138 Pu-241 Fast 1.221350e-03 7.816670e-04
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Cs-138m U-235 Thermal 2.734600e-03 3.008070e-04
Cs-138m U-235 Fast 4.179350e-03 2.674780e-03
Cs-138m U-235 High 9.874130e-03 6.319440e-03
Cs-138m U-238 Fast 3.778190e-04 2.418050e-04
Cs-138m U-238 High 2.585680e-03 1.654830e-03
Cs-138m Pu-239 Thermal 5.288450e-03 3.384610e-03
Cs-138m Pu-239 Fast 8.546830e-03 5.469970e-03
Cs-138m Pu-239 High 1.494260e-02 4.781620e-03
Cs-138m Pu-241 Thermal 2.018090e-03 1.291580e-03
Cs-138m Pu-241 Fast 2.044290e-03 1.308350e-03
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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-138 U-235 Thermal 6.700010e-02 6.336930e-04
Cs-138 U-235 Fast 6.583760e-02 2.541740e-03
Cs-138 U-235 High 4.312090e-02 7.101420e-03
Cs-138 U-238 Fast 5.751180e-02 1.609710e-03
Cs-138 U-238 High 4.832510e-02 2.064830e-03
Cs-138 Pu-239 Thermal 5.969180e-02 3.597250e-03
Cs-138 Pu-239 Fast 5.913190e-02 4.922410e-03
Cs-138 Pu-239 High 3.549110e-02 5.689970e-03
Cs-138 Pu-241 Thermal 6.562140e-02 2.628820e-03
Cs-138 Pu-241 Fast 6.098470e-02 6.678130e-03
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Cs-138m U-235 Thermal 2.734600e-03 3.012930e-04
Cs-138m U-235 Fast 4.179350e-03 2.674780e-03
Cs-138m U-235 High 9.874130e-03 6.310080e-03
Cs-138m U-238 Fast 3.778190e-04 2.417160e-04
Cs-138m U-238 High 2.585680e-03 1.653040e-03
Cs-138m Pu-239 Thermal 5.288450e-03 3.384610e-03
Cs-138m Pu-239 Fast 8.546830e-03 5.469970e-03
Cs-138m Pu-239 High 1.494260e-02 4.778530e-03
Cs-138m Pu-241 Thermal 2.018090e-03 1.291370e-03
Cs-138m Pu-241 Fast 2.044290e-03 1.308350e-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