Zinc-77m

Properties and data of the isotope ⁷⁷Zn.

Content

General data

Name of the isotope:Zinc-77m; Zn-77mSymbol:⁷⁷Zn or 7730ZnMass number A:77 (= number of nucleons)Atomic number Z:30 (= number of protons)Neutrons N:47Isotopic mass:76.9368872(21) u (atomic weight of Zinc-77m)
Excitation energy: 772.440(15) keVNuclide mass:76.9204303 u (calculated nuclear mass without electrons)Mass excess:-58.78919 MeVMass defect:0.70511481200001 u (per nucleus)Nuclear binding energy:656.81021669 MeV (per nucleus)
8.53000281 MeV (average binding energy per nucleon)Half-life:1.05(10) sDecay constant λ:0.66014017196185 s^-1Specific activity α:5.230864609022 × 10⁺²¹ Bq g^-1
141374719162.77 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2-)Magnetic dipole moment:μ(μ_N) = +0.562(2)Nuclear g-factor:g_l = 1.124

Radioactive Decay

Half-life T_½ = 1.05(10) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁷⁷Ga	66(7) %
Iso	⁷⁷Zn	34(7) %

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
⁷⁷Zn		2.08(5) s	(7/2+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 47) and isobaric (same nucleon number A = 77) with Zinc-77m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 47	Isobar A = 77
26	⁷³Fe
27	⁷⁴Co
28	⁷⁵Ni	⁷⁷Ni
29	⁷⁶Cu	⁷⁷Cu
30	⁷⁷Zn	⁷⁷Zn
31	⁷⁸Ga	⁷⁷Ga
32	⁷⁹Ge	⁷⁷Ge
33	⁸⁰As	⁷⁷As
34	⁸¹Se	⁷⁷Se
35	⁸²Br	⁷⁷Br
36	⁸³Kr	⁷⁷Kr
37	⁸⁴Rb	⁷⁷Rb
38	⁸⁵Sr	⁷⁷Sr
39	⁸⁶Y	⁷⁷Y
40	⁸⁷Zr	⁷⁷Zr
41	⁸⁸Nb
42	⁸⁹Mo
43	⁹⁰Tc
44	⁹¹Ru
45	⁹²Rh
46	⁹³Pd
47	⁹⁴Ag
48	⁹⁵Cd
49	⁹⁶In