Cobalt-60
Properties and data of the isotope 60Co.
See also: list of Cobalt isotopes.
General data
Name of the isotope:Cobalt-60; Co-60Symbol:60Co or 6027CoMass number A:60 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:33Isotopic mass:59.9338157(5) u (atomic weight of Cobalt-60)Nuclide mass:59.9190044 u (calculated nuclear mass without electrons)Mass excess:-61.65028 MeVMass defect:0.563402392 u (per nucleus)Nuclear binding energy:524.80594773 MeV (per nucleus)
8.7467658 MeV (average binding energy per nucleon)Separation energy:SN = 7.49192(7) MeV (first neutron)
SP = 8.2745(4) MeV (first proton)Half-life:5.2713(8) aDecay constant λ:4.169664576716 × 10-9 s-1Specific activity α:42559843084194 Bq g-1
1150.2660293025 Ci g-1Spin and parity:
(nuclear angular momentum)5+Magnetic dipole moment:μ(μN) = + 3.799(8)Quadrupole moment Q:+0.44(5) barn (100 fm2)Nuclear g-factor:gl = 0.7598Year of discovery:1941
Radioactive Decay
Half-life T½ = 5.2713(8) a respectively 1.66235717 × 108 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 60Ni | 100 % | 2.82281(21) MeV | |
Parent Nuclides
Direct parent isotope is: 60Fe.
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 |
---|
60mCo | 58.59(1) keV | 10.467(6) min | 2+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 33) and isobaric (same nucleon number A = 60) with Cobalt-60. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 33 | Isobar A = 60 |
16 | 49S | |
17 | 50Cl | |
18 | 51Ar | |
19 | 52K | |
20 | 53Ca | |
21 | 54Sc | 60Sc |
22 | 55Ti | 60Ti |
23 | 56V | 60V |
24 | 57Cr | 60Cr |
25 | 58Mn | 60Mn |
26 | 59Fe | 60Fe |
27 | 60Co | 60Co |
28 | 61Ni | 60Ni |
29 | 62Cu | 60Cu |
30 | 63Zn | 60Zn |
31 | 64Ga | 60Ga |
32 | 65Ge | 60Ge |
33 | 66As | |
34 | 67Se | |
35 | 68Br | |
36 | 69Kr | |
External data and identifiers
Last update: 2023-10-04
Perma link: https://www.chemlin.org/isotope/cobalt-60
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