Germanium-79m

Properties and data of the isotope ^79mGe.

Contents

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

General data

Name of the isotope:Germanium-79m; Ge-79mSymbol:^79mGe or 79m32GeMass number A:79 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:47Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.46875 (= neutron-proton ratio)Neutron excess (N-Z):15Excitation energy:185.95(4) keVIsotopic mass:78.92536(4) u (atomic weight of Germanium-79m)Nuclide mass:78.907806 u (calculated nuclear mass without electrons)Mass excess:-69.52671 MeVMass defect:0.73229207600001 u (per nucleus)Nuclear binding energy:682.12567504 MeV (per nucleus)
8.63450222 MeV (average binding energy per nucleon)Half-life:39.0(10) sDecay constant λ:0.017773004629742 s^-1Specific activity α:1.356110831910 × 10⁺²⁰ Bq g^-1
3665164410.5689 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2+)

Radioactive Decay

Half-life T_½ = 39.0(10) s respectively 3.90 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁷⁹As	96(1) %
Iso	⁷⁹Ge	4(1) %

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
⁷⁹Ge		18.98(3) s	(1/2)-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 47) and isobaric (same nucleon number A = 79) with Germanium-79m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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