Cobalt-54m

Properties and data of the isotope ^54mCo.

Contents

General data

Name of the isotope:Cobalt-54m; Co-54mSymbol:^54mCo or 54m27CoMass number A:54 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:27Isotopic mass:53.9484592(4) u (atomic weight of Cobalt-54m)
Excitation energy: 197.1(4) keVNuclide 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)Half-life:1.48(2) minDecay constant λ:0.0078057114927922 s^-1Specific activity α:8.869263041815 × 10⁺¹⁹ Bq g^-1
2397098119.4096 Ci g^-1Spin and parity:
(nuclear angular momentum)7+Isobaric spin: 0

Radioactive Decay

Half-life T_½ = 1.48(2) min (minutes) respectively 8.88 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC β⁺	⁵⁴Fe	100 %	8.445(5) MeV

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
⁵⁴Co		193.28(7) ms	0+

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-54m. 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
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