Cobalt-73

Properties and data of the isotope ⁷³Co.

Contents

General data

Name of the isotope:Cobalt-73; Co-73Symbol:⁷³Co or 7327CoMass number A:73 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:46Isotopic mass:72.95983(43) u (atomic weight of Cobalt-73)Nuclide mass:72.9450187 u (calculated nuclear mass without electrons)Mass excess:-37.41811 MeVMass defect:0.65003200000001 u (per nucleus)Nuclear binding energy:605.50090781 MeV (per nucleus)
8.29453298 MeV (average binding energy per nucleon)Separation energy:S_N = 5.29(56) MeV (first neutron)
S_P = 16.28(64) MeV (first proton)Half-life:40.7(13) msDecay constant λ:17.242467178108 s^-1Specific activity α:1.442174529436 × 10⁺²³ Bq g^-1
3897768998476.2 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2-)~Year of discovery:1995

Radioactive Decay

Half-life T_½ = 40.7(13) ms respectively 4.02 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	⁷³Ni		12.69(40) MeV
β^-, n	⁷²Ni	22(8) %	8.74(40) MeV
β^-, 2n	⁷¹Ni	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 46) and isobaric (same nucleon number A = 73) with Cobalt-73. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 46	Isobar A = 73
25	⁷¹Mn
26	⁷²Fe	⁷³Fe
27	⁷³Co	⁷³Co
28	⁷⁴Ni	⁷³Ni
29	⁷⁵Cu	⁷³Cu
30	⁷⁶Zn	⁷³Zn
31	⁷⁷Ga	⁷³Ga
32	⁷⁸Ge	⁷³Ge
33	⁷⁹As	⁷³As
34	⁸⁰Se	⁷³Se
35	⁸¹Br	⁷³Br
36	⁸²Kr	⁷³Kr
37	⁸³Rb	⁷³Rb
38	⁸⁴Sr	⁷³Sr
39	⁸⁵Y
40	⁸⁶Zr
41	⁸⁷Nb
42	⁸⁸Mo
43	⁸⁹Tc
44	⁹⁰Ru
45	⁹¹Rh
46	⁹²Pd
47	⁹³Ag
48	⁹⁴Cd