Cobalt-53

Properties and data of the isotope ⁵³Co.

Content

General data

Name of the isotope:Cobalt-53; Co-53Symbol: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-53)Nuclide 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)Separation energy:S_N = 16.370(9) MeV (first neutron)
S_P = 1.618(5) MeV (first proton)Half-life:240(9) msDecay constant λ:2.8881132523331 s^-1Specific activity α:3.344735543269 × 10⁺²² Bq g^-1
903982579261.95 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2-)Mirror nucleus:Iron-53Year of discovery:1970

Radioactive Decay

Half-life T_½ = 240(9) ms respectively 2.40 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE β⁺	⁵³Fe	100 %	8.2881(24) MeV

Parent Nuclides

Direct parent isotope is: ⁵³Ni.

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
^53mCo	3197(29) keV	247(12) ms	(19/2-)

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-53. 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