Gallium-71 is a stable isotope of the chemical element gallium, comprising 39,9 % of terrestrial gallium deposits. The atomic nucleus of this nuclide contains 40 neutrons in its atomic nucleus in addition to the element-specific 31 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 71.
Gallium-71 was discovered - according to a report from 1923 [1] - during the mass spectrometric analysis of Gallium trifluoride.
See also: List of individual Gallium isotopes (and general data sources).
General data
Name of the isotope:Gallium-71; Ga-71Symbol:71Ga or 7131GaMass number A:71 (= number of nucleons)Atomic number Z:31 (= number of protons)Neutrons N:40Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.2903225806452 (= neutron-proton ratio)Neutron excess (N-Z):9Isotopic mass:70.9247026(9) u (atomic weight of Gallium-71)Nuclide mass:70.9076972 u (calculated nuclear mass without electrons)Mass excess:-70.13908 MeVMass defect:0.664470032 u (per nucleus)Nuclear binding energy:618.94984799 MeV (per nucleus) 8.71760349 MeV (average binding energy per nucleon)Separation energy:SN = 9.3003(14) MeV (first neutron) SP = 7.8633(21) MeV (first proton)Half-life:stableSpin and parity: (nuclear angular momentum)3/2-Magnetic dipole moment:μ(μN) = +2.56033(9)Charge radius:4.0118(18) femtometer fmYear of discovery:1923
Comparison of the natural Gallium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
Atomic Mass ma
Quantity
Half-life
Spin
Gallium Isotopic mixture
69.723 u
100 %
Isotope 69Ga
68.9255735(13) u
60.108(50) %
stable
3/2-
Isotope 71Ga
70.9247026(9) u
39.892(50) %
stable
3/2-
NMR data
Nuclear magnetic properties and parameters of the NMR active Nuclide71Ga
Isotope:71Ga-NMRQuantity:39.892(50) %Spin:3/2-Nuclearmagnetic moment μ/μN:+2.56033(9)Gyromagnetic ratio γ:8.181171 · 107 rad T-1 s-1 13.02074 MHz T-1Nuclear g-factor:gl = 1.7068866666667Quadrupole moment Q:+0.107(1) barn (100 fm2)Line width parameter (factor):l = 152.65 fm4Resonance frequency:v0 = 13.0208 MHz at 1 TRelative Sensitivity:[related to 1H = 1.000]: 0.14300 (H0 = const.) 1.5291 (v0 = const.) 0.0571 (at natural abundance) relative receptivity as compared to 13C: 335 (at natural abundance) 1087 (enriched)Reference compound: (conditions)IUPAC recommendation: 1.1 molar gallium nitrate solution Ga(NO3)3 in deuterium oxide D2O.Frequency ratio:Ξ(71Ga) = 30.496704 % [based on the reference substance]Chemical shift range:ca. 1440 ppm [-710 to 730]
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 40) and isobaric (same nucleon number A = 71) with Gallium-71. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
