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Cobalt-72

Properties and data of the isotope 72Co.


Content

See also: list of Cobalt isotopes.

 

General data

Name of the isotope:Cobalt-72; Co-72Symbol:72Co or 7227CoMass number A:72 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:45Isotopic mass:71.95684(43) u (atomic weight of Cobalt-72)Nuclide mass:71.9420287 u (calculated nuclear mass without electrons)Mass excess:-40.20328 MeVMass defect:0.64435708400001 u (per nucleus)Nuclear binding energy:600.2147576 MeV (per nucleus)
8.33631608 MeV (average binding energy per nucleon)
Separation energy:SN = 7.13(40) MeV (first neutron)
SP = 16.06(56) MeV (first proton)
Half-life:59.9(17) msDecay constant λ:11.571739241401 s-1Specific activity α:9.815020240306 × 10+22 Bq g-1
2652708173055.8 Ci g-1
Spin and parity:
(nuclear angular momentum)
(6-.7-)Year of discovery:1992

 

Radioactive Decay

Half-life T½ = 59.9(17) ms respectively 5.99 × 10-2 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-72Ni94 %14.04(40) MeV
β-, n71Ni6 %7.13(40) MeV

 

Parent Nuclides

Direct parent isotope is: 72Fe.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 45) and isobaric (same nucleon number A = 72) with Cobalt-72. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 45Isobar A = 72
2570Mn
2671Fe72Fe
2772Co72Co
2873Ni72Ni
2974Cu72Cu
3075Zn72Zn
3176Ga72Ga
3277Ge72Ge
3378As72As
3479Se72Se
3580Br72Br
3681Kr72Kr
3782Rb72Rb
3883Sr
3984Y
4085Zr
4186Nb
4287Mo
4388Tc
4489Ru
4590Rh
4691Pd
4792Ag

 

External data and identifiers

Adopted Levels, Gammas:NuDat 72Co

 


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Last update: 2020-10-14


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