Information about Niobium-99:


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Mass-Energy Data:

Atomic Mass:	98.911618	±	0.000014	amu
Excess Mass (Δ):	-82.327417	±	0.013320	MeV
Binding Energy:	849.311886	±	0.013320	MeV
β^- Decay Energy:	3.638662	±	0.013290	MeV

"The 1995 update to the atomic mass evaluation" by G.Audi and A.H.Wapstra, Nuclear Physics A595 vol. 4 p.409-480, December 25, 1995.

Radioactive Decay Data:

Spin: 9/2+
Half life: 15.0 s ( 15 sec., λ = 0.0462098 s^-1)
Mode of decay:
β^-
to
99
42
Mo
(Q = 3.639 MeV)
Meta state at 0.365 Mev
Spin: 1/2- 15.0
Half life: 2.6 min ( 156 sec., λ = 0.00444325 s^-1)
Mode of decay:
β^-
to
99
42
Mo
(Q = 4.004 MeV) Branch ratio: >96.20 %
Mode of decay: γ (IT) (Q = 0.365 MeV) Branch ratio: <3.80 %
Possible parent nuclides:
β^- from
99
40
Zr

R.R.Kinsey, et al.,The NUDAT/PCNUDAT Program for Nuclear Data,paper submitted to the 9 th International Symposium of Capture-Gamma_raySpectroscopy and Related Topics, Budapest, Hungary, Octover 1996.Data extracted from NUDAT database (Jan. 14/1999)