Cobalt-69

Properties and data of the isotope ⁶⁹Co.

Contents

General data

Name of the isotope:Cobalt-69; Co-69Symbol:⁶⁹Co or 6927CoMass number A:69 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:42Isotopic mass:68.94602(15) u (atomic weight of Cobalt-69)Nuclide mass:68.9312087 u (calculated nuclear mass without electrons)Mass excess:-50.28205 MeVMass defect:0.629182336 u (per nucleus)Nuclear binding energy:586.07957089 MeV (per nucleus)
8.49390682 MeV (average binding energy per nucleon)Separation energy:S_N = 6.42(24) MeV (first neutron)
S_P = 14.08(39) MeV (first proton)Half-life:227(11) msDecay constant λ:3.0535118086341 s^-1Specific activity α:2.704217386628 × 10⁺²² Bq g^-1
730869563953.7 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2-)Year of discovery:1985

Radioactive Decay

Half-life T_½ = 227(11) ms respectively 2.27 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁶⁹Ni	100 %	9.70(14) MeV

Parent Nuclides

Direct parent isotope is: ⁶⁹Fe.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 42) and isobaric (same nucleon number A = 69) with Cobalt-69. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 42	Isobar A = 69
23	⁶⁵V
24	⁶⁶Cr
25	⁶⁷Mn	⁶⁹Mn
26	⁶⁸Fe	⁶⁹Fe
27	⁶⁹Co	⁶⁹Co
28	⁷⁰Ni	⁶⁹Ni
29	⁷¹Cu	⁶⁹Cu
30	⁷²Zn	⁶⁹Zn
31	⁷³Ga	⁶⁹Ga
32	⁷⁴Ge	⁶⁹Ge
33	⁷⁵As	⁶⁹As
34	⁷⁶Se	⁶⁹Se
35	⁷⁷Br	⁶⁹Br
36	⁷⁸Kr	⁶⁹Kr
37	⁷⁹Rb
38	⁸⁰Sr
39	⁸¹Y
40	⁸²Zr
41	⁸³Nb
42	⁸⁴Mo
43	⁸⁵Tc
44	⁸⁶Ru