40-Zr-99
Spin
Level energy(keV) Spin & Parity
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ground state (1/2+)
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)
98.916666746 ± 0.000011358 (amu) [mass excess = -77624.426 ± 10.580 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
4707.369 ± 16.030 (keV)
Strong Gamma-rays from Decay of Zr- 99 (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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469.14 55. B-
546.13 48.29 B-
593.99 27.23 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- 2.1 S 1
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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Zr- 99 U-235 Thermal 3.578500e-02 8.230540e-03
Zr- 99 U-235 Fast 3.356460e-02 1.074070e-02
Zr- 99 U-235 High 2.902570e-02 9.288220e-03
Zr- 99 U-238 Fast 1.471290e-02 4.708120e-03
Zr- 99 U-238 High 2.172480e-02 6.951910e-03
Zr- 99 Pu-239 Thermal 3.762610e-02 1.204040e-02
Zr- 99 Pu-239 Fast 4.001160e-02 1.280380e-02
Zr- 99 Pu-239 High 2.590390e-02 8.289240e-03
Zr- 99 Pu-241 Thermal 3.350080e-02 1.072020e-02
Zr- 99 Pu-241 Fast 2.896880e-02 9.270030e-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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Zr- 99 U-235 Thermal 5.660060e-02 6.199910e-03
Zr- 99 U-235 Fast 5.822650e-02 9.267090e-03
Zr- 99 U-235 High 4.315520e-02 9.867830e-03
Zr- 99 U-238 Fast 6.226830e-02 6.810320e-03
Zr- 99 U-238 High 5.597360e-02 8.879120e-03
Zr- 99 Pu-239 Thermal 5.239100e-02 1.669830e-02
Zr- 99 Pu-239 Fast 5.310740e-02 1.216900e-02
Zr- 99 Pu-239 High 3.458150e-02 7.919460e-03
Zr- 99 Pu-241 Thermal 5.762650e-02 9.163490e-03
Zr- 99 Pu-241 Fast 5.398810e-02 8.582030e-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