Copper-65
Properties and data of the isotope 65Cu.
Copper-65 is a stable, naturally occurring isotope of the chemical element copper, which has 36 neutrons in its atomic nucleus in addition to the element-specific 29 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 65.
According to a report from 1923, Cu-65 was discovered by evaluating the mass spectra recorded from Copper(I) chloride using the accelerated anode ray method [1].
See also: List of individual Copper isotopes (and general data sources).
General data
Name of the isotope:Copper-65; Cu-65Symbol:65Cu or 6529CuMass number A:65 (= number of nucleons)Atomic number Z:29 (= number of protons)Neutrons N:36Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.2413793103448 (= neutron-proton ratio)Neutron excess (N-Z):7Isotopic mass:64.9277895(7) u (atomic weight of Copper-65)Nuclide mass:64.9118811 u (calculated nuclear mass without electrons)Mass excess:-67.26365 MeVMass defect:0.61107340400001 u (per nucleus)Nuclear binding energy:569.21120939 MeV (per nucleus)
8.75709553 MeV (average binding energy per nucleon)Separation energy:SN = 9.9106(7) MeV (first neutron)
SP = 7.4536(7) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)3/2-Magnetic dipole moment:μ(μN) = 2.3844(4)Charge radius:3.9022(14) femtometer fmYear of discovery:1923
Parent Nuclides
Direct parent isotopes are: 65Zn, 65Ni.
Occurrence
Comparison of the natural Copper isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
| | Atomic Mass ma | Quantity | Half-life | Spin |
|---|
Copper
Isotopic mixture | 63.546 u | 100 % | | |
| Isotope 63Cu | 62.9295971(5) u | 69.15(15) % | stable | 3/2- |
| Isotope 65Cu | 64.9277895(7) u | 30.85(15) % | stable | 3/2- |
NMR data
Nuclear magnetic properties and parameters of the NMR active Nuclide 65Cu
Isotope:65Cu-NMRQuantity:30.85(15) %Spin:3/2-Nuclearmagnetic moment
μ/μN:2.3844(4)Gyromagnetic ratio γ:7.60435 · 107 rad T-1 s-1
12.10270 MHz T-1Nuclear g-factor:gl = 1.5896Quadrupole moment Q:-0.204(14) barn (100 fm2)Line width parameter (factor):l = 554.88 fm4Resonance frequency:v0 = 12.1027 MHz at 1 TRelative Sensitivity:[related to 1H = 1.000]:
0.11484 (H0 = const.)
1.4213 (v0 = const.)
0.0354 (at natural abundance)
relative receptivity as compared to 13C:
208 (at natural abundance)
675 (enriched)Reference compound:
(conditions)IUPAC: Pure tetrakis(acetonitrile)copper(I) perchlorate [Cu(CH3CN)4][ClO4] mixed with a small amount (< 10 %) of benzene-d6 C6D6.Frequency ratio:Ξ(65Cu) = 28.403693 % [based on the reference substance]Chemical shift range:ca. 1100 ppm [-300 to 800]
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 36) and isobaric (same nucleon number A = 65) with Copper-65. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 36 | Isobar A = 65 |
|---|
| 18 | 54Ar | |
| 19 | 55K | |
| 20 | 56Ca | |
| 21 | 57Sc | |
| 22 | 58Ti | 65Ti |
| 23 | 59V | 65V |
| 24 | 60Cr | 65Cr |
| 25 | 61Mn | 65Mn |
| 26 | 62Fe | 65Fe |
| 27 | 63Co | 65Co |
| 28 | 64Ni | 65Ni |
| 29 | 65Cu | 65Cu |
| 30 | 66Zn | 65Zn |
| 31 | 67Ga | 65Ga |
| 32 | 68Ge | 65Ge |
| 33 | 69As | 65As |
| 34 | 70Se | 65Se |
| 35 | 71Br | |
| 36 | 72Kr | |
| 37 | 73Rb | |
| 38 | 74Sr | |
External data and identifiers
Literature and References
[1] - F. W. Aston:
The Mass-Spectrum of Copper.
In: Nature, 112, 162, (1923), DOI 10.1038/112162a0.
Last update: 2026-01-19
Perma link: https://www.chemlin.org/isotope/copper-65
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