Cobalt-64

Properties and data of the isotope ⁶⁴Co.

Contents

General data

Name of the isotope:Cobalt-64; Co-64Symbol:⁶⁴Co or 6427CoMass number A:64 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:37Isotopic mass:63.935810(21) u (atomic weight of Cobalt-64)Nuclide mass:63.9209987 u (calculated nuclear mass without electrons)Mass excess:-59.7926 MeVMass defect:0.596067756 u (per nucleus)Nuclear binding energy:555.23353831 MeV (per nucleus)
8.67552404 MeV (average binding energy per nucleon)Separation energy:S_N = 6.012(27) MeV (first neutron)
S_P = 11.446(20) MeV (first proton)Half-life:0.30(3) sDecay constant λ:2.3104906018665 s^-1Specific activity α:2.208587279365 × 10⁺²² Bq g^-1
596915480909.49 Ci g^-1Spin and parity:
(nuclear angular momentum)1+Year of discovery:1969

Radioactive Decay

Half-life T_½ = 0.30(3) s respectively 3.0 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁶⁴Ni	100 %	7.307(20) MeV

Parent Nuclides

Direct parent isotope is: ⁶⁴Fe.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 37) and isobaric (same nucleon number A = 64) with Cobalt-64. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 37	Isobar A = 64
19	⁵⁶K
20	⁵⁷Ca
21	⁵⁸Sc
22	⁵⁹Ti	⁶⁴Ti
23	⁶⁰V	⁶⁴V
24	⁶¹Cr	⁶⁴Cr
25	⁶²Mn	⁶⁴Mn
26	⁶³Fe	⁶⁴Fe
27	⁶⁴Co	⁶⁴Co
28	⁶⁵Ni	⁶⁴Ni
29	⁶⁶Cu	⁶⁴Cu
30	⁶⁷Zn	⁶⁴Zn
31	⁶⁸Ga	⁶⁴Ga
32	⁶⁹Ge	⁶⁴Ge
33	⁷⁰As	⁶⁴As
34	⁷¹Se	⁶⁴Se
35	⁷²Br
36	⁷³Kr
37	⁷⁴Rb
38	⁷⁵Sr
39	⁷⁶Y
40	⁷⁷Zr