Cobalt-53m

Properties and data of the isotope ⁵³Co.

Content

General data

Name of the isotope:Cobalt-53m; Co-53mSymbol:⁵³Co or 5327CoMass number A:53 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:26Isotopic mass:52.9542032(18) u (atomic weight of Cobalt-53m)
Excitation energy: 3197(29) keVNuclide mass:52.9393919 u (calculated nuclear mass without electrons)Mass excess:-42.65944 MeVMass defect:0.48236048 u (per nucleus)Nuclear binding energy:449.31589296 MeV (per nucleus)
8.47765836 MeV (average binding energy per nucleon)Half-life:247(12) msDecay constant λ:2.8062638889067 s^-1Specific activity α:3.249945467144 × 10⁺²² Bq g^-1
878363639768.7 Ci g^-1Spin and parity:
(nuclear angular momentum)(19/2-)

Radioactive Decay

Half-life T_½ = 247(12) ms respectively 2.47 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE β⁺	⁵³Fe	98.5 %
p	⁵²Fe	1.5 %

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
⁵³Co		240(9) ms	(7/2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 26) and isobaric (same nucleon number A = 53) with Cobalt-53m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 26	Isobar A = 53
11	³⁷Na
12	³⁸Mg
13	³⁹Al
14	⁴⁰Si
15	⁴¹P
16	⁴²S
17	⁴³Cl
18	⁴⁴Ar	⁵³Ar
19	⁴⁵K	⁵³K
20	⁴⁶Ca	⁵³Ca
21	⁴⁷Sc	⁵³Sc
22	⁴⁸Ti	⁵³Ti
23	⁴⁹V	⁵³V
24	⁵⁰Cr	⁵³Cr
25	⁵¹Mn	⁵³Mn
26	⁵²Fe	⁵³Fe
27	⁵³Co	⁵³Co
28	⁵⁴Ni	⁵³Ni
29	⁵⁵Cu	⁵³Cu
30	⁵⁶Zn