Yttrium-89

Properties and data of the isotope ⁸⁹Y.

Contents

General data

Name of the isotope:Yttrium-89; Y-89Symbol:⁸⁹Y or 8939YMass number A:89 (= number of nucleons)Atomic number Z:39 (= number of protons)Neutrons N:50Isotopic mass:88.90584(2) u (atomic weight of Yttrium-89)Nuclide mass:88.8844463 u (calculated nuclear mass without electrons)Mass excess:-87.70948 MeVMass defect:0.83258204799999 u (per nucleus)Nuclear binding energy:775.54518222 MeV (per nucleus)
8.71399081 MeV (average binding energy per nucleon)Separation energy:S_N = 11.4835(15) MeV (first neutron)
S_P = 7.0783(3) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)1/2-Magnetic dipole moment:μ(μ_N) = -0.1374154(3)Charge radius:4.2430(21) femtometer fmYear of discovery:1923

Parent Nuclides

Direct parent isotopes are: ⁸⁹Zr, ⁸⁹Sr.

Occurrence

Comparison of the natural Yttrium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Yttrium Isotopic mixture	88.90584 u	100 %
Isotope ⁸⁹Y	88.90584(2) u	100 %	stable	1/2-

NMR data

Nuclear magnetic properties of the NMR active Nuclide ⁸⁹Y

Isotope:⁸⁹Y-NMRQuantity:100 %Spin:1/2-Nuclearmagnetic moment
μ/μ_N:-0.1374154(3)Gyromagnetic ratio γ:- 1.3155 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = -0.2748308Resonance frequency:v₀ = 2.0949 at 1 TRelative Sensitivity:0.00012 (H₀ = const.)
0.0492 (v₀ = const.)
[related to ¹H = 1.000]

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
^89mY	908.97(3) keV	15.663(5) s	9/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 50) and isobaric (same nucleon number A = 89) with Yttrium-89. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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