Niobium-92

Properties and data of the isotope ⁹²Nb.

Contents

General data

Name of the isotope:Niobium-92; Nb-92Symbol:⁹²Nb or 9241NbMass number A:92 (= number of nucleons)Atomic number Z:41 (= number of protons)Neutrons N:51Isotopic mass:91.9071886(19) u (atomic weight of Niobium-92)Nuclide mass:91.8846978 u (calculated nuclear mass without electrons)Mass excess:-86.45326 MeVMass defect:0.85554842800001 u (per nucleus)Nuclear binding energy:796.93822739 MeV (per nucleus)
8.66237204 MeV (average binding energy per nucleon)Separation energy:S_N = 7.887(3) MeV (first neutron)
S_P = 5.8467(18) MeV (first proton)Half-life:3.47(24) × 10⁷ aDecay constant λ:6.334165103656 × 10^-16 s^-1Specific activity α:4191784.0092656 Bq g^-1
0.00011329145970988 Ci g^-1Spin and parity:
(nuclear angular momentum)(7)+Magnetic dipole moment:μ(μ_N) = +5.130(4)Quadrupole moment Q:-0.35(3) barn (100 fm²)Nuclear g-factor:g_l = 0.73285714285714Charge radius:4.3026(43) femtometer fmYear of discovery:1938

Radioactive Decay

Half-life T_½ = 3.47(24) × 10⁷ a respectively 1.0942992 × 10¹⁵ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	⁹²Zr	> 99.95 %	2.0057(18) MeV
β^-	⁹²Mo	< 0.05 %	0.3553(18) MeV

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^92m1Nb	135.5(4) keV	10.15(2) d	(2)+
^92m2Nb	225.8(4) keV	5.9(2) μs	(2)-
^92m3Nb	2203.3(4) keV	167(4) ns	(11-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 51) and isobaric (same nucleon number A = 92) with Niobium-92. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 51	Isobar A = 92
28	⁷⁹Ni
29	⁸⁰Cu
30	⁸¹Zn
31	⁸²Ga
32	⁸³Ge
33	⁸⁴As	⁹²As
34	⁸⁵Se	⁹²Se
35	⁸⁶Br	⁹²Br
36	⁸⁷Kr	⁹²Kr
37	⁸⁸Rb	⁹²Rb
38	⁸⁹Sr	⁹²Sr
39	⁹⁰Y	⁹²Y
40	⁹¹Zr	⁹²Zr
41	⁹²Nb	⁹²Nb
42	⁹³Mo	⁹²Mo
43	⁹⁴Tc	⁹²Tc
44	⁹⁵Ru	⁹²Ru
45	⁹⁶Rh	⁹²Rh
46	⁹⁷Pd	⁹²Pd
47	⁹⁸Ag	⁹²Ag
48	⁹⁹Cd
49	¹⁰⁰In
50	¹⁰¹Sn

External data and identifiers

CAS:13982-37-1InChI Key:GUCVJGMIXFAOAE-BJUDXGSMSA-NSMILES:[92Nb]PubChem:ID 44148211Adopted Levels, Gammas:NuDat 92Nb

Literature and References

[1] - Maria Schönbächler, Mark Rehkämper, Alex N. Halliday, Der-Chuen Lee, Michèle Bourot-Denise, Brigitte Zanda, Bodo Hattendorf, Detlef Günther:
Niobium-Zirconium Chronometry and Early Solar System Development.
In: Science, (2002), DOI 10.1126/science.1067400.

[2] - Makiko K. Haba, Yi-Jen Lai, Jörn-Frederik Wotzlaw, Akira Yamaguchi, Maria Lugaro, Maria Schönbächler:
Precise initial abundance of Niobium-92 in the Solar System and implications for p-process nucleosynthesis.
In: Proceedings of the National Academy of Sciences of the USA, PNAS, (2021), DOI 10.1073/pnas.2017750118.