Copper-72

Properties and data of the isotope ⁷²Cu.

Contents

General data

Name of the isotope:Copper-72; Cu-72Symbol:⁷²Cu or 7229CuMass number A:72 (= number of nucleons)Atomic number Z:29 (= number of protons)Neutrons N:43Isotopic mass:71.9358203(15) u (atomic weight of Copper-72)Nuclide mass:71.9199119 u (calculated nuclear mass without electrons)Mass excess:-59.78301 MeVMass defect:0.663697016 u (per nucleus)Nuclear binding energy:618.22978822 MeV (per nucleus)
8.58652484 MeV (average binding energy per nucleon)Separation energy:S_N = 5.1432(20) MeV (first neutron)
S_P = 1.6657(26) MeV (first proton)Half-life:6.63(3) sDecay constant λ:0.10454708605731 s^-1Specific activity α:8.86756730609 × 10⁺²⁰ Bq g^-1
23966398124.592 Ci g^-1Spin and parity:
(nuclear angular momentum)2-Magnetic dipole moment:μ(μ_N) = -1.3487(10)Nuclear g-factor:g_l = -0.67435Year of discovery:1983

Radioactive Decay

Half-life T_½ = 6.63(3) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁷²Zn	100 %	8.3625(26) MeV

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
⁷²Cu	270.3 keV	176(3) μs	(6-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 43) and isobaric (same nucleon number A = 72) with Copper-72. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 43	Isobar A = 72
23	⁶⁶V
24	⁶⁷Cr
25	⁶⁸Mn
26	⁶⁹Fe	⁷²Fe
27	⁷⁰Co	⁷²Co
28	⁷¹Ni	⁷²Ni
29	⁷²Cu	⁷²Cu
30	⁷³Zn	⁷²Zn
31	⁷⁴Ga	⁷²Ga
32	⁷⁵Ge	⁷²Ge
33	⁷⁶As	⁷²As
34	⁷⁷Se	⁷²Se
35	⁷⁸Br	⁷²Br
36	⁷⁹Kr	⁷²Kr
37	⁸⁰Rb	⁷²Rb
38	⁸¹Sr
39	⁸²Y
40	⁸³Zr
41	⁸⁴Nb
42	⁸⁵Mo
43	⁸⁶Tc
44	⁸⁷Ru