Gallium-71
Properties and data of the isotope 71Ga.
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
Parent Nuclides
Direct parent isotopes are: 71Ge, 71Zn.
Occurrence
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 Nuclide 71Ga
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.
| Z | Isotone N = 40 | Isobar A = 71 |
|---|
| 19 | 59K | |
| 21 | 61Sc | |
| 22 | 62Ti | |
| 23 | 63V | |
| 24 | 64Cr | |
| 25 | 65Mn | 71Mn |
| 26 | 66Fe | 71Fe |
| 27 | 67Co | 71Co |
| 28 | 68Ni | 71Ni |
| 29 | 69Cu | 71Cu |
| 30 | 70Zn | 71Zn |
| 31 | 71Ga | 71Ga |
| 32 | 72Ge | 71Ge |
| 33 | 73As | 71As |
| 34 | 74Se | 71Se |
| 35 | 75Br | 71Br |
| 36 | 76Kr | 71Kr |
| 37 | 77Rb | 71Rb |
| 38 | 78Sr | |
| 39 | 79Y | |
| 40 | 80Zr | |
| 41 | 81Nb | |
| 42 | 82Mo | |
External data and identifiers
Literature and References
[1] - F. W. Aston:
Further Determinations of the Constitution of the Elements by the Method of Accelerated Anode Rays.
In: Nature, 112, (1923), DOI 10.1038/112449a0.
Last update: 2026-01-21
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