Zinc-78m

Properties and data of the isotope ^78mZn.

Contents

See also: List of individual Zinc isotopes (and general data sources).

General data

Name of the isotope:Zinc-78m; Zn-78mSymbol:^78mZn or 78m30ZnMass number A:78 (= number of nucleons)Atomic number Z:30 (= number of protons)Neutrons N:48Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.6 (= neutron-proton ratio)Neutron excess (N-Z):18Excitation energy:2673.7(10) keVIsotopic mass:77.9382892(21) u (atomic weight of Zinc-78m)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)Half-life:319(9) nsDecay constant λ:2172875.1741691 s^-1Specific activity α:1.699397450637 × 10⁺²⁸ Bq g^-1
4.59296608280 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)(8+)

Radioactive Decay

Half-life T_½ = 319(9) ns respectively 3.19 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	⁷⁸Zn	100 %

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
⁷⁸Zn		1.47(15) s	0+

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-78m. 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
50	⁹⁸Sn