Cobalt-58m1

Properties and data of the isotope ^58m1Co.

Contents

General data

Name of the isotope:Cobalt-58m1; Co-58m1Symbol:^58m1Co or 58m127CoMass number A:58 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:31Isotopic mass:57.9357513(12) u (atomic weight of Cobalt-58m1)
Excitation energy: 24.95(6) keVNuclide mass:57.92094 u (calculated nuclear mass without electrons)Mass excess:-59.84728 MeVMass defect:0.54413696 u (per nucleus)Nuclear binding energy:506.86031342 MeV (per nucleus)
8.73897092 MeV (average binding energy per nucleon)Half-life:9.10(9) hDecay constant λ:2.115833884493 × 10^-5 s^-1Specific activity α:2.23541222607 × 10⁺¹⁷ Bq g^-1
6041654.6650757 Ci g^-1Spin and parity:
(nuclear angular momentum)5+

Radioactive Decay

Half-life T_½ = 9.10(9) h (hours) respectively 3.2760 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	⁵⁸Co	100 %

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
⁵⁸Co		70.86(6) d	2+
^58m2Co	53.15(7) keV	10.5(3) μs	4+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 31) and isobaric (same nucleon number A = 58) with Cobalt-58m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 31	Isobar A = 58
15	⁴⁶P
16	⁴⁷S
17	⁴⁸Cl
18	⁴⁹Ar
19	⁵⁰K
20	⁵¹Ca	⁵⁸Ca
21	⁵²Sc	⁵⁸Sc
22	⁵³Ti	⁵⁸Ti
23	⁵⁴V	⁵⁸V
24	⁵⁵Cr	⁵⁸Cr
25	⁵⁶Mn	⁵⁸Mn
26	⁵⁷Fe	⁵⁸Fe
27	⁵⁸Co	⁵⁸Co
28	⁵⁹Ni	⁵⁸Ni
29	⁶⁰Cu	⁵⁸Cu
30	⁶¹Zn	⁵⁸Zn
31	⁶²Ga	⁵⁸Ga
32	⁶³Ge
33	⁶⁴As
34	⁶⁵Se
35	⁶⁶Br
36	⁶⁷Kr