Niobium-90

Properties and data of the isotope ⁹⁰Nb.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Niobium isotopes (and general data sources).

General data

Name of the isotope:Niobium-90; Nb-90Symbol:⁹⁰Nb or 9041NbMass number A:90 (= number of nucleons)Atomic number Z:41 (= number of protons)Neutrons N:49Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.1951219512195 (= neutron-proton ratio)Neutron excess (N-Z):8Isotopic mass:89.911259(4) u (atomic weight of Niobium-90)Nuclide mass:89.8887682 u (calculated nuclear mass without electrons)Mass excess:-82.66171 MeVMass defect:0.834148196 u (per nucleus)Nuclear binding energy:777.00403968 MeV (per nucleus)
8.63337822 MeV (average binding energy per nucleon)Separation energy:S_N = 10.108(24) MeV (first neutron)
S_P = 5.075(5) MeV (first proton)Half-life:14.60(5) hDecay constant λ:1.318773174581 × 10^-5 s^-1Specific activity α:8.923413280488 × 10⁺¹⁶ Bq g^-1
2411733.3190509 Ci g^-1Spin and parity:
(nuclear angular momentum)8+Magnetic dipole moment:μ(μ_N) = 4.946(4)Nuclear g-factor:g_l = 0.61825Charge radius:4.2891(40) femtometer fmYear of discovery:1951

Radioactive Decay

Half-life T_½ = 14.60(5) h (hours) respectively 5.2560 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁹⁰Zr	100 %	6.111(3) MeV

Parent Nuclides

Direct parent isotope is: ⁹⁰Mo.

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
^90m1Nb	122.370(22) keV	63(2) μs	6+
^90m2Nb	124.67(25) keV	18.81(6) s	4-
^90m3Nb	171.10(10) keV	1 μs	7+
^90m4Nb	382.01(25) keV	6.19(8) ms	1+
^90m5Nb	1880.21(20) keV	472(13) ns	(11-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 49) and isobaric (same nucleon number A = 90) with Niobium-90. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 49	Isobar A = 90
27	⁷⁶Co
28	⁷⁷Ni
29	⁷⁸Cu
30	⁷⁹Zn
31	⁸⁰Ga
32	⁸¹Ge	⁹⁰Ge
33	⁸²As	⁹⁰As
34	⁸³Se	⁹⁰Se
35	⁸⁴Br	⁹⁰Br
36	⁸⁵Kr	⁹⁰Kr
37	⁸⁶Rb	⁹⁰Rb
38	⁸⁷Sr	⁹⁰Sr
39	⁸⁸Y	⁹⁰Y
40	⁸⁹Zr	⁹⁰Zr
41	⁹⁰Nb	⁹⁰Nb
42	⁹¹Mo	⁹⁰Mo
43	⁹²Tc	⁹⁰Tc
44	⁹³Ru	⁹⁰Ru
45	⁹⁴Rh	⁹⁰Rh
46	⁹⁵Pd	⁹⁰Pd
47	⁹⁶Ag
48	⁹⁷Cd
49	⁹⁸In
50	⁹⁹Sn