Niobium-91m1

Properties and data of the isotope ^91m1Nb.

Contents

General data

Name of the isotope:Niobium-91m1; Nb-91m1Symbol:^91m1Nb or 91m141NbMass number A:91 (= number of nucleons)Atomic number Z:41 (= number of protons)Neutrons N:50Isotopic mass:90.906990(3) u (atomic weight of Niobium-91m1)
Excitation energy: 104.60(5) keVNuclide mass:90.8844992 u (calculated nuclear mass without electrons)Mass excess:-86.63826 MeVMass defect:0.84708211200001 u (per nucleus)Nuclear binding energy:789.05190484 MeV (per nucleus)
8.67090005 MeV (average binding energy per nucleon)Half-life:60.86(22) dDecay constant λ:1.318195335530 × 10^-7 s^-1Specific activity α:8.820397768304 × 10⁺¹⁴ Bq g^-1
23838.912887309 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2-Magnetic dipole moment:μ(μ_N) = -0.101(2)Nuclear g-factor:g_l = -0.202

Radioactive Decay

Half-life T_½ = 60.86(22) d respectively 5.258304 × 10⁶ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁹¹Zr	3.4(5) %
Iso	⁹¹Nb	96.6(5) %

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
⁹¹Nb		680(130) a	9/2+
^91m2Nb	2034.42(20) keV	3.76(12) μs	(17/2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 50) and isobaric (same nucleon number A = 91) with Niobium-91m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 50	Isobar A = 91
28	⁷⁸Ni
29	⁷⁹Cu
30	⁸⁰Zn
31	⁸¹Ga
32	⁸²Ge
33	⁸³As	⁹¹As
34	⁸⁴Se	⁹¹Se
35	⁸⁵Br	⁹¹Br
36	⁸⁶Kr	⁹¹Kr
37	⁸⁷Rb	⁹¹Rb
38	⁸⁸Sr	⁹¹Sr
39	⁸⁹Y	⁹¹Y
40	⁹⁰Zr	⁹¹Zr
41	⁹¹Nb	⁹¹Nb
42	⁹²Mo	⁹¹Mo
43	⁹³Tc	⁹¹Tc
44	⁹⁴Ru	⁹¹Ru
45	⁹⁵Rh	⁹¹Rh
46	⁹⁶Pd	⁹¹Pd
47	⁹⁷Ag
48	⁹⁸Cd
49	⁹⁹In
50	¹⁰⁰Sn