Cobalt-75

Properties and data of the isotope ⁷⁵Co.

Content

General data

Name of the isotope:Cobalt-75; Co-75Symbol:⁷⁵Co or 7527CoMass number A:75 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:48Isotopic mass:74.96817(54) u (atomic weight of Cobalt-75)Nuclide mass:74.9533587 u (calculated nuclear mass without electrons)Mass excess:-29.64945 MeVMass defect:0.65902183200001 u (per nucleus)Nuclear binding energy:613.87488238 MeV (per nucleus)
8.18499843 MeV (average binding energy per nucleon)Separation energy:S_N = 4.90(71) MeV (first neutron)
S_P = 17.35(78) MeV (first proton)Half-life:30(11) msDecay constant λ:23.104906018665 s^-1Specific activity α:1.880283764864 × 10⁺²³ Bq g^-1
5081848013148.4 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2-)~Year of discovery:1995

Radioactive Decay

Half-life T_½ = 30(11) ms respectively 3.0 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	⁷⁵Ni		14.38(58) MeV
β^-, n	⁷⁴Ni	< 16 %	10.74(54) MeV
β^-, 2n	⁷³Ni	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 48) and isobaric (same nucleon number A = 75) with Cobalt-75. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 48	Isobar A = 75
26	⁷⁴Fe
27	⁷⁵Co	⁷⁵Co
28	⁷⁶Ni	⁷⁵Ni
29	⁷⁷Cu	⁷⁵Cu
30	⁷⁸Zn	⁷⁵Zn
31	⁷⁹Ga	⁷⁵Ga
32	⁸⁰Ge	⁷⁵Ge
33	⁸¹As	⁷⁵As
34	⁸²Se	⁷⁵Se
35	⁸³Br	⁷⁵Br
36	⁸⁴Kr	⁷⁵Kr
37	⁸⁵Rb	⁷⁵Rb
38	⁸⁶Sr	⁷⁵Sr
39	⁸⁷Y
40	⁸⁸Zr
41	⁸⁹Nb
42	⁹⁰Mo
43	⁹¹Tc
44	⁹²Ru
45	⁹³Rh
46	⁹⁴Pd
47	⁹⁵Ag
48	⁹⁶Cd
49	⁹⁷In