Cobalt-74

Properties and data of the isotope ⁷⁴Co.

Content

General data

Name of the isotope:Cobalt-74; Co-74Symbol:⁷⁴Co or 7427CoMass number A:74 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:47Isotopic mass:73.96477(54) u (atomic weight of Cobalt-74)Nuclide mass:73.9499587 u (calculated nuclear mass without electrons)Mass excess:-32.81653 MeVMass defect:0.65375691600001 u (per nucleus)Nuclear binding energy:608.97064471 MeV (per nucleus)
8.22933304 MeV (average binding energy per nucleon)Separation energy:S_N = 3.47(64) MeV (first neutron)
S_P = 17.21(71) MeV (first proton)Half-life:31.3(15) msDecay constant λ:22.145277334184 s^-1Specific activity α:1.826876431353 × 10⁺²³ Bq g^-1
4937503868523.5 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1995

Radioactive Decay

Half-life T_½ = 31.3(15) ms respectively 3.13 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	⁷⁴Ni		15.64(54) MeV
β^-, n	⁷³Ni	18(15) %	9.22(50) MeV
β^-, 2n	⁷²Ni	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 47) and isobaric (same nucleon number A = 74) with Cobalt-74. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 47	Isobar A = 74
26	⁷³Fe	⁷⁴Fe
27	⁷⁴Co	⁷⁴Co
28	⁷⁵Ni	⁷⁴Ni
29	⁷⁶Cu	⁷⁴Cu
30	⁷⁷Zn	⁷⁴Zn
31	⁷⁸Ga	⁷⁴Ga
32	⁷⁹Ge	⁷⁴Ge
33	⁸⁰As	⁷⁴As
34	⁸¹Se	⁷⁴Se
35	⁸²Br	⁷⁴Br
36	⁸³Kr	⁷⁴Kr
37	⁸⁴Rb	⁷⁴Rb
38	⁸⁵Sr	⁷⁴Sr
39	⁸⁶Y
40	⁸⁷Zr
41	⁸⁸Nb
42	⁸⁹Mo
43	⁹⁰Tc
44	⁹¹Ru
45	⁹²Rh
46	⁹³Pd
47	⁹⁴Ag
48	⁹⁵Cd
49	⁹⁶In