Zinc-78

Properties and data of the isotope ⁷⁸Zn.

Contents

General data

Name of the isotope:Zinc-78; Zn-78Symbol:⁷⁸Zn or 7830ZnMass number A:78 (= number of nucleons)Atomic number Z:30 (= number of protons)Neutrons N:48Isotopic mass:77.9382892(21) u (atomic weight of Zinc-78)Nuclide mass:77.9218323 u (calculated nuclear mass without electrons)Mass excess:-57.48324 MeVMass defect:0.71237772800001 u (per nucleus)Nuclear binding energy:663.57557937 MeV (per nucleus)
8.50737922 MeV (average binding energy per nucleon)Separation energy:S_N = 6.7654(28) MeV (first neutron)
S_P = 16.15(15) MeV (first proton)Half-life:1.47(15) sDecay constant λ:0.47152869425847 s^-1Specific activity α:3.687808073151 × 10⁺²¹ Bq g^-1
99670488463.549 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1977

Radioactive Decay

Half-life T_½ = 1.47(15) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁷⁸Ga	100 %	6.2227(27) MeV

Parent Nuclides

Direct parent isotope is: ⁷⁹Cu.

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
^78mZn	2673.7(10) keV	319(9) ns	(8+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 48) and isobaric (same nucleon number A = 78) with Zinc-78. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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