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Cobalt-57

Properties and data of the isotope 57Co.


Content

See also: list of Cobalt isotopes.

 

General data

Name of the isotope:Cobalt-57; Co-57Symbol:57Co or 5727CoMass number A:57 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:30Isotopic mass:56.9362898(6) u (atomic weight of Cobalt-57)Nuclide mass:56.9214785 u (calculated nuclear mass without electrons)Mass excess:-59.34567 MeVMass defect:0.534933544 u (per nucleus)Nuclear binding energy:498.28738663 MeV (per nucleus)
8.74188398 MeV (average binding energy per nucleon)
Separation energy:SN = 11.3765(6) MeV (first neutron)
SP = 6.0275(4) MeV (first proton)
Half-life:271.74(6) dDecay constant λ:2.952284099520 × 10-8 s-1Specific activity α:3.174834054618 × 10+14 Bq g-1
8580.6325800495 Ci g-1
Spin and parity:
(nuclear angular momentum)
7/2-Isobaric spin: 3/2Magnetic dipole moment:μ(μN) = +4.720(10)Quadrupole moment Q:+0.52(9) barn (100 fm2)Nuclear g-factor:gl = 1.3485714285714Mirror nucleus:Zinc-57Year of discovery:1941

 

Radioactive Decay

Half-life T½ = 271.74(6) d respectively 2.3478336 × 107 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
EE57Fe100 %0.8364(6) MeV0.12206065(12) MeV
85.60(17) %

 

Parent Nuclides

Direct parent isotope is: 57Ni.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 30) and isobaric (same nucleon number A = 57) with Cobalt-57. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 30Isobar A = 57
1343Al
1444Si
1545P
1646S
1747Cl
1848Ar
1949K
2050Ca57Ca
2151Sc57Sc
2252Ti57Ti
2353V57V
2454Cr57Cr
2555Mn57Mn
2656Fe57Fe
2757Co57Co
2858Ni57Ni
2959Cu57Cu
3060Zn57Zn
3161Ga
3262Ge
3363As
3464Se

 

External data and identifiers

CAS:13981-50-5InChI Key:GUTLYIVDDKVIGB-YPZZEJLDSA-NSMILES:[57Co]PubChem:ID 104851Adopted Levels, Gammas:NuDat 57Co

 


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Last update: 2023-10-04


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