Cobalt-52m

Properties and data of the isotope ⁵²Co.

Content

General data

Name of the isotope:Cobalt-52m; Co-52mSymbol: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-52m)
Excitation energy: 380(100) keVNuclide 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)Half-life:104 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)2+

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
⁵²Co		104(7) ms	(6+)

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-52m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	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