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
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 61Ni
60.9310548(4) u
1.1399(13) %
stable
3/2-
Isotope 62Ni
61.928345(4) u
3.6345(40) %
stable
0+
Isotope 64Ni
63.927967(4) u
0.9256(19) %
stable
0+
NMR data
Nuclear magnetic properties and parameters of the NMR active Nuclide61Ni
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.
