Cobalt-52

Properties and data of the isotope ⁵²Co.

Contents

General data

Name of the isotope:Cobalt-52; Co-52Symbol:⁵²Co or 5227CoMass number A:52 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:25Isotopic mass:51.963112(9) u (atomic weight of Cobalt-52)Nuclide mass:51.9483007 u (calculated nuclear mass without electrons)Mass excess:-34.36095 MeVMass defect:0.464786764 u (per nucleus)Nuclear binding energy:432.94608195 MeV (per nucleus)
8.32588619 MeV (average binding energy per nucleon)Separation energy:S_N = 15.09(5) MeV (first neutron)
S_P = 1.447(12) MeV (first proton)Half-life:104(7) msDecay constant λ:6.6648767361533 s^-1Specific activity α:7.869965984162 × 10⁺²² Bq g^-1
2127017833557.5 Ci g^-1Spin and parity:
(nuclear angular momentum)(6+)Mirror nucleus:Manganese-52Year of discovery:1987

Radioactive Decay

Half-life T_½ = 104(7) ms respectively 1.04 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC β⁺	⁵²Fe	100 %	13.696(19) MeV
β⁺, p	⁵¹Mn	?

Parent Nuclides

Direct parent isotope is: ⁵²Ni.

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
^52mCo	380(100) keV	104 ms	2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 25) and isobaric (same nucleon number A = 52) with Cobalt-52. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 25	Isobar A = 52
11	³⁶Na
12	³⁷Mg
13	³⁸Al
14	³⁹Si
15	⁴⁰P
16	⁴¹S
17	⁴²Cl
18	⁴³Ar	⁵²Ar
19	⁴⁴K	⁵²K
20	⁴⁵Ca	⁵²Ca
21	⁴⁶Sc	⁵²Sc
22	⁴⁷Ti	⁵²Ti
23	⁴⁸V	⁵²V
24	⁴⁹Cr	⁵²Cr
25	⁵⁰Mn	⁵²Mn
26	⁵¹Fe	⁵²Fe
27	⁵²Co	⁵²Co
28	⁵³Ni	⁵²Ni
29	⁵⁴Cu
30	⁵⁵Zn