Cobalt-54

Properties and data of the isotope ⁵⁴Co.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Cobalt isotopes (and general data sources).

General data

Name of the isotope:Cobalt-54; Co-54Symbol:⁵⁴Co or 5427CoMass number A:54 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:27Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1 (= neutron-proton ratio)Neutron excess (N-Z):0Isotopic mass:53.9484592(4) u (atomic weight of Cobalt-54)Nuclide mass:53.9336479 u (calculated nuclear mass without electrons)Mass excess:-48.00995 MeVMass defect:0.496769396 u (per nucleus)Nuclear binding energy:462.73771176 MeV (per nucleus)
8.56921688 MeV (average binding energy per nucleon)Separation energy:S_N = 13.4218(17) MeV (first neutron)
S_P = 4.3514(16) MeV (first proton)Half-life:193.28(7) msDecay constant λ:3.5862333431289 s^-1Specific activity α:4.074868367721 × 10⁺²² Bq g^-1
1101315775059.9 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Isobaric spin: 1Year of discovery:1952

Radioactive Decay

Half-life T_½ = 193.28(7) ms respectively 1.9328 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC β⁺	⁵⁴Fe	100 %	8.2445(5) MeV

Parent Nuclides

Direct parent isotope is: ⁵⁴Ni.

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
^54mCo	197.1(4) keV	1.48(2) min	7+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 27) and isobaric (same nucleon number A = 54) with Cobalt-54. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 27	Isobar A = 54
11	³⁸Na
12	³⁹Mg
13	⁴⁰Al
14	⁴¹Si
15	⁴²P
16	⁴³S
17	⁴⁴Cl
18	⁴⁵Ar	⁵⁴Ar
19	⁴⁶K	⁵⁴K
20	⁴⁷Ca	⁵⁴Ca
21	⁴⁸Sc	⁵⁴Sc
22	⁴⁹Ti	⁵⁴Ti
23	⁵⁰V	⁵⁴V
24	⁵¹Cr	⁵⁴Cr
25	⁵²Mn	⁵⁴Mn
26	⁵³Fe	⁵⁴Fe
27	⁵⁴Co	⁵⁴Co
28	⁵⁵Ni	⁵⁴Ni
29	⁵⁶Cu	⁵⁴Cu
30	⁵⁷Zn	⁵⁴Zn
31	⁵⁸Ga
32	⁵⁹Ge