Nickel-61
Properties and data of the isotope 61Ni.
Nickel-61 is a stable, naturally occuring isotope of the chemical element nickel, which has 33 neutrons in its atomic nucleus in addition to the element-specific 28 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 61.
The first mass spectrographic detection and thus the discovery of Ni-61 was reported in 1934 [1].
See also: List of individual Nickel isotopes (and general data sources).
General data
Name of the isotope:Nickel-61; Ni-61Symbol:61Ni or 6128NiMass number A:61 (= number of nucleons)Atomic number Z:28 (= number of protons)Neutrons N:33Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.1785714285714 (= neutron-proton ratio)Neutron excess (N-Z):5Isotopic mass:60.9310548(4) u (atomic weight of Nickel-61)Nuclide mass:60.915695 u (calculated nuclear mass without electrons)Mass excess:-64.22204 MeVMass defect:0.57398832400001 u (per nucleus)Nuclear binding energy:534.66667988 MeV (per nucleus)
8.76502754 MeV (average binding energy per nucleon)Separation energy:SN = 7.82010(5) MeV (first neutron)
SP = 9.86056(22) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)3/2-Magnetic dipole moment:μ(μN) = -0.74965(5)Charge radius:3.8225(19) femtometer fmYear of discovery:1934
Parent Nuclides
Direct parent isotopes are: 61Cu, 61Co.
Occurrence
Comparison of the natural Nickel isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
| | Atomic Mass ma | Quantity | Half-life | Spin |
|---|
Nickel
Isotopic mixture | 58.6934 u | 100 % | | |
| Isotope 58Ni | 57.935342(3) u | 68.0769(190) % | stable | 0+ |
| Isotope 60Ni | 59.930786(3) u | 26.2231(150) % | stable | 0+ |
| Isotope 64Ni | 63.927967(4) u | 0.9256(19) % | stable | 0+ |
| Isotope 62Ni | 61.928345(4) u | 3.6345(40) % | stable | 0+ |
| Isotope 61Ni | 60.9310548(4) u | 1.1399(13) % | stable | 3/2- |
NMR data
Nuclear magnetic properties and parameters of the NMR active Nuclide 61Ni
Isotope:61Ni-NMRQuantity:1.1399(13) %Spin:3/2-Nuclearmagnetic moment
μ/μN:-0.74965(5)Gyromagnetic ratio γ:-2.3948 · 107 rad T-1 s-1
-3.81144 MHz T-1Nuclear g-factor:gl = -0.49976666666667Quadrupole moment Q:+0.162(15) barn (100 fm2)Line width parameter (factor):l = 349.92 fm4Resonance frequency:v0 = 3.8114 MHz at 1 TRelative Sensitivity:[related to 1H = 1.000]:
0.00359 (H0 = const.)
0.4476 (v0 = const.)
0.0000409 (at natural abundance)
relative receptivity as compared to 13C:
0.240 (at natural abundance)
21.1 (enriched)Reference compound:
(conditions)Pure Nickel tetracarbonyl Ni(CO)4 mixed with 20% Benzene-d6 C6D6.Frequency ratio:Ξ(61Ni) = 8.936051 % [based on the reference substance]Chemical shift range:ca. 1200 ppm [-930 to 270]
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 33) and isobaric (same nucleon number A = 61) with Nickel-61. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 33 | Isobar A = 61 |
|---|
| 16 | 49S | |
| 17 | 50Cl | |
| 18 | 51Ar | |
| 19 | 52K | |
| 20 | 53Ca | |
| 21 | 54Sc | 61Sc |
| 22 | 55Ti | 61Ti |
| 23 | 56V | 61V |
| 24 | 57Cr | 61Cr |
| 25 | 58Mn | 61Mn |
| 26 | 59Fe | 61Fe |
| 27 | 60Co | 61Co |
| 28 | 61Ni | 61Ni |
| 29 | 62Cu | 61Cu |
| 30 | 63Zn | 61Zn |
| 31 | 64Ga | 61Ga |
| 32 | 65Ge | 61Ge |
| 33 | 66As | |
| 34 | 67Se | |
| 35 | 68Br | |
| 36 | 69Kr | |
External data and identifiers
Literature and References
[1] - F. W. Aston:
Constitution of Carbon, Nickel and Cadmium.
In: Nature, 134, 178, (1934), DOI 10.1038/134178a0.
Last update: 2026-01-16
Perma link: https://www.chemlin.org/isotope/nickel-61
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