Cobalt-58
Properties and data of the isotope 58Co.
See also: list of Cobalt isotopes.
General data
Name of the isotope:Cobalt-58; Co-58Symbol:58Co or 5827CoMass number A:58 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:31Isotopic mass:57.9357513(12) u (atomic weight of Cobalt-58)Nuclide mass:57.92094 u (calculated nuclear mass without electrons)Mass excess:-59.84728 MeVMass defect:0.54413696 u (per nucleus)Nuclear binding energy:506.86031342 MeV (per nucleus)
8.73897092 MeV (average binding energy per nucleon)Separation energy:SN = 8.5730(12) MeV (first neutron)
SP = 6.9542(11) MeV (first proton)Half-life:70.86(6) dDecay constant λ:1.13216720463 × 10-7 s-1Specific activity α:1.196152698825 × 10+15 Bq g-1
32328.451319614 Ci g-1Spin and parity:
(nuclear angular momentum)2+Magnetic dipole moment:μ(μN) = +4.044(8)Quadrupole moment Q:+0.23(3) barn (100 fm2)Nuclear g-factor:gl = 2.022Mirror nucleus:Gallium-58Year of discovery:1941
Radioactive Decay
Half-life T½ = 70.86(6) d respectively 6.122304 × 106 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC β+ | 58Fe | 100 % | 2.3080(12) MeV | 0.8107593(20) MeV
99.45(1) % |
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
| Nuclear Isomer | Excitation Energy | Half-life | Spin |
|---|
| 58m1Co | 24.95(6) keV | 9.10(9) h | 5+ |
| 58m2Co | 53.15(7) keV | 10.5(3) μs | 4+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 31) and isobaric (same nucleon number A = 58) with Cobalt-58. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 31 | Isobar A = 58 |
|---|
| 15 | 46P | |
| 16 | 47S | |
| 17 | 48Cl | |
| 18 | 49Ar | |
| 19 | 50K | |
| 20 | 51Ca | 58Ca |
| 21 | 52Sc | 58Sc |
| 22 | 53Ti | 58Ti |
| 23 | 54V | 58V |
| 24 | 55Cr | 58Cr |
| 25 | 56Mn | 58Mn |
| 26 | 57Fe | 58Fe |
| 27 | 58Co | 58Co |
| 28 | 59Ni | 58Ni |
| 29 | 60Cu | 58Cu |
| 30 | 61Zn | 58Zn |
| 31 | 62Ga | 58Ga |
| 32 | 63Ge | |
| 33 | 64As | |
| 34 | 65Se | |
| 35 | 66Br | |
| 36 | 67Kr | |
External data and identifiers
Last update: 2023-10-04
Perma link: https://www.chemlin.org/isotope/cobalt-58
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