93-Np-240
Spin
Level energy(keV) Spin & Parity
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ground state (5+)
ground state(+X) (1+)
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)
240.056165427 ± 0.000018428 (amu) [mass excess = 52317.758 ± 17.166 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
2190.573 ± 17.075 (keV)
Strong Gamma-rays from Decay of Np-240 (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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554.60 20.87 B-
597.40 11.69 B-
1496.9 1.33 B-
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566.34 27.6 B-
600.57 20. B-
973.9 25.9 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- 61.9 M 2
B- 7.22 M 2
Evaluated Data Libraries
Links to the libraries.
Parent Nuclides by Reactions in JENDL-4.0
Np-239 (Z= 93, A=239), MT=102 (n,γ)