Information about Niobium-91:


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Mass-Energy Data:

Atomic Mass:	90.906991	±	0.000003	amu
Excess Mass (Δ):	-86.637743	±	0.003210	MeV
Binding Energy:	789.051629	±	0.003212	MeV
β^- Decay Energy:	-4.434112	±	0.011403	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: 680 years ( 2.14472×10⁺¹⁰ sec., λ = 3.23188×10^-11 s^-1)
Mode of decay:
E.C.
to
91
40
Zr
(Q = 1.253 MeV)
Meta state at 0.104 Mev
Spin: 1/2- 680
Half life: 60.86 days ( 5.2583×10⁺⁰⁶ sec., λ = 1.3182×10^-07 s^-1)
Mode of decay: γ (IT) (Q = 0.105 MeV) Branch ratio: 93.00 %
Mode of decay:
E.C.
to
91
40
Zr
(Q = 1.358 MeV) Branch ratio: 7.00 %
Meta state at 2.034 Mev
Spin: 17/2-) 60.86
Half life: 3.76 µs ( 3.76×10^-06 sec., λ = 184348 s^-1)
Mode of decay: γ (IT) (Q = 2.034 MeV)
Possible parent nuclides:
E.C. from
91
42
Mo

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)

Magnetic Dipole Moments and Electric Quadrupole Moments
Ex(kev)	T_1/2	Spin	m(nm)	Q(b)	Ref. Std.	Method	Reference
1985	10 ns	13/2-	+9.14(13)			TDPAD	Cf77Tash 374 (77)
2037	3.4 ms	17/2-	+10.82(14)			TDPAD	NP A293 248 (77)
			+10.81(15)			TDPAD	RRou 24 661 (79)
3467	0.9 ns	21/2+	+12(2)			IPAD	APPo B8 147 (77)

N. J. Stone, Table of Nuclear Magnetic Dipole and Electric Quadrupole Moments, to be published. 2000 Courtesy of T. Burrows at BNL/NNDC.