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Cobalt-56

Properties and data of the isotope 56Co.


Content

See also: list of Cobalt isotopes.

 

General data

Name of the isotope:Cobalt-56; Co-56Symbol:56Co or 5627CoMass number A:56 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:29Isotopic mass:55.9398380(5) u (atomic weight of Cobalt-56)Nuclide mass:55.9250267 u (calculated nuclear mass without electrons)Mass excess:-56.04054 MeVMass defect:0.522720428 u (per nucleus)Nuclear binding energy:486.91094236 MeV (per nucleus)
8.69483826 MeV (average binding energy per nucleon)
Separation energy:SN = 10.0818(5) MeV (first neutron)
SP = 5.8481(4) MeV (first proton)
Half-life:77.236(26) dDecay constant λ:1.038704336324 × 10-7 s-1Specific activity α:1.137313422758 × 10+15 Bq g-1
30738.200615103 Ci g-1
Spin and parity:
(nuclear angular momentum)
4+Magnetic dipole moment:μ(μN) = 3.85(1)Quadrupole moment Q:+0.25(9) barn (100 fm2)Nuclear g-factor:gl = 0.9625Mirror nucleus:Copper-56Year of discovery:1941

 

Radioactive Decay

Half-life T½ = 77.236(26) d respectively 6.6731904 × 106 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
EE β+56Fe100 %4.5666(5) MeV

 

Parent Nuclides

Direct parent isotope is: 56Ni.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 29) and isobaric (same nucleon number A = 56) with Cobalt-56. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 29Isobar A = 56
1342Al
1443Si
1544P
1645S
1746Cl
1847Ar
1948K56K
2049Ca56Ca
2150Sc56Sc
2251Ti56Ti
2352V56V
2453Cr56Cr
2554Mn56Mn
2655Fe56Fe
2756Co56Co
2857Ni56Ni
2958Cu56Cu
3059Zn56Zn
3160Ga
3261Ge
3362As
3463Se

 

External data and identifiers

Adopted Levels, Gammas:NuDat 56Co

 


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Last update: 2023-10-12


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