Copper-78

Properties and data of the isotope ⁷⁸Cu.

Contents

General data

Name of the isotope:Copper-78; Cu-78Symbol:⁷⁸Cu or 7829CuMass number A:78 (= number of nucleons)Atomic number Z:29 (= number of protons)Neutrons N:49Isotopic mass:77.95223(54) u (atomic weight of Copper-78)Nuclide mass:77.9363216 u (calculated nuclear mass without electrons)Mass excess:-44.49747 MeVMass defect:0.69927681200001 u (per nucleus)Nuclear binding energy:651.37215472 MeV (per nucleus)
8.35092506 MeV (average binding energy per nucleon)Separation energy:S_N = 3.94(52) MeV (first neutron)
S_P = 14.99(71) MeV (first proton)Half-life:335(11) msDecay constant λ:2.069096061373 s^-1Specific activity α:1.618232199263 × 10⁺²² Bq g^-1
437360053854.97 Ci g^-1Spin and parity:
(nuclear angular momentum)(4-.5-.6-)Magnetic dipole moment:μ(μ_N) = +0.238(3)Year of discovery:1991

Radioactive Decay

Half-life T_½ = 335(11) ms respectively 3.35 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁷⁸Zn	35	12.99(50) MeV
β^-, n	⁷⁷Zn	65(8) %	6.22(50) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 49) and isobaric (same nucleon number A = 78) with Copper-78. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 49	Isobar A = 78
27	⁷⁶Co
28	⁷⁷Ni	⁷⁸Ni
29	⁷⁸Cu	⁷⁸Cu
30	⁷⁹Zn	⁷⁸Zn
31	⁸⁰Ga	⁷⁸Ga
32	⁸¹Ge	⁷⁸Ge
33	⁸²As	⁷⁸As
34	⁸³Se	⁷⁸Se
35	⁸⁴Br	⁷⁸Br
36	⁸⁵Kr	⁷⁸Kr
37	⁸⁶Rb	⁷⁸Rb
38	⁸⁷Sr	⁷⁸Sr
39	⁸⁸Y	⁷⁸Y
40	⁸⁹Zr	⁷⁸Zr
41	⁹⁰Nb
42	⁹¹Mo
43	⁹²Tc
44	⁹³Ru
45	⁹⁴Rh
46	⁹⁵Pd
47	⁹⁶Ag
48	⁹⁷Cd
49	⁹⁸In
50	⁹⁹Sn