57-La-149
Spin
Level energy(keV) Spin & Parity
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ground state
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)
148.935351260 ± 0.000214990 (amu) [mass excess = -60219.913 ± 200.262 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
6450.000 ± 200.000 (keV)
Strong Gamma-rays from Decay of La-149 (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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133.5 13.5 B-
142.6 6.78 B-
245.4 5.67 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- 1.05 S 3
Evaluated Data Libraries
Links to the libraries.
Parent Nuclides by Reactions in JENDL-4.0
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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La-149 U-235 Thermal 7.975400e-04 5.104250e-04
La-149 U-235 Fast 1.257030e-03 8.044960e-04
La-149 U-235 High 2.892160e-04 1.850990e-04
La-149 U-238 Fast 6.643070e-03 4.251570e-03
La-149 U-238 High 3.368040e-03 2.155550e-03
La-149 Pu-239 Thermal 3.632830e-04 2.325010e-04
La-149 Pu-239 Fast 3.897170e-04 2.494190e-04
La-149 Pu-239 High 1.147640e-04 7.344920e-05
La-149 Pu-241 Thermal 2.448350e-03 1.566940e-03
La-149 Pu-241 Fast 1.787380e-03 1.143920e-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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La-149 U-235 Thermal 8.078100e-04 5.169980e-04
La-149 U-235 Fast 1.282500e-03 8.208020e-04
La-149 U-235 High 2.921770e-04 1.867240e-04
La-149 U-238 Fast 7.114040e-03 3.202510e-03
La-149 U-238 High 3.504010e-03 2.241030e-03
La-149 Pu-239 Thermal 3.654440e-04 2.338840e-04
La-149 Pu-239 Fast 3.921160e-04 2.509540e-04
La-149 Pu-239 High 1.155290e-04 7.389440e-05
La-149 Pu-241 Thermal 2.501040e-03 1.600610e-03
La-149 Pu-241 Fast 1.819690e-03 1.164600e-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