2-He-8
Spin
Level energy(keV) Spin & Parity
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ground state 0+
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)
8.033934390 ± 0.000000095 (amu) [mass excess = 31609.681 ± 0.089 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
10663.878 ± 0.100 (keV)
Strong Gamma-rays from Decay of He- 8 (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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980. 84. 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(%). ]
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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He- 8 U-235 Thermal 5.084850e-07 1.261040e-07
He- 8 U-235 Fast 4.477390e-07 1.110390e-07
He- 8 U-235 High 3.480500e-07 8.631640e-08
He- 8 U-238 Fast 3.984740e-07 9.882150e-08
He- 8 U-238 High 3.007150e-07 7.457730e-08
He- 8 Pu-239 Thermal 5.560250e-07 1.378940e-07
He- 8 Pu-239 Fast 5.000680e-07 1.240170e-07
He- 8 Pu-239 High 6.119570e-07 1.517650e-07
He- 8 Pu-241 Thermal 5.433360e-07 1.347470e-07
He- 8 Pu-241 Fast 5.258840e-07 1.304190e-07
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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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He- 8 U-235 Thermal 5.084850e-07 1.261040e-07
He- 8 U-235 Fast 4.477390e-07 1.110390e-07
He- 8 U-235 High 3.480500e-07 8.631640e-08
He- 8 U-238 Fast 3.984740e-07 9.882150e-08
He- 8 U-238 High 3.007150e-07 7.457730e-08
He- 8 Pu-239 Thermal 5.560250e-07 1.378940e-07
He- 8 Pu-239 Fast 5.000680e-07 1.240170e-07
He- 8 Pu-239 High 6.119570e-07 1.517650e-07
He- 8 Pu-241 Thermal 5.433360e-07 1.347470e-07
He- 8 Pu-241 Fast 5.258840e-07 1.304190e-07
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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