Germanium-77m

Properties and data of the isotope ^77mGe.

Contents

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

General data

Name of the isotope:Germanium-77m; Ge-77mSymbol:^77mGe or 77m32GeMass number A:77 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:45Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.40625 (= neutron-proton ratio)Neutron excess (N-Z):13Excitation energy:159.71(6)Isotopic mass:76.92354984(6) u (atomic weight of Germanium-77m)Nuclide mass:76.9059959 u (calculated nuclear mass without electrons)Mass excess:-71.21287 MeVMass defect:0.716772404 u (per nucleus)Nuclear binding energy:667.66919369 MeV (per nucleus)
8.67102849 MeV (average binding energy per nucleon)Half-life:53.7(6) sDecay constant λ:0.012907768725511 s^-1Specific activity α:1.010514989547 × 10⁺²⁰ Bq g^-1
2731121593.3727 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2-Year of discovery:1939

Radioactive Decay

Half-life T_½ = 53.7(6) s respectively 5.37 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁷⁷As	81(2) %
Iso	⁷⁷Ge	19(2) %

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
⁷⁷Ge		11.211(3) h	7/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 45) and isobaric (same nucleon number A = 77) with Germanium-77m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 45	Isobar A = 77
23	⁶⁸V
25	⁷⁰Mn
26	⁷¹Fe
27	⁷²Co
28	⁷³Ni	⁷⁷Ni
29	⁷⁴Cu	⁷⁷Cu
30	⁷⁵Zn	⁷⁷Zn
31	⁷⁶Ga	⁷⁷Ga
32	⁷⁷Ge	⁷⁷Ge
33	⁷⁸As	⁷⁷As
34	⁷⁹Se	⁷⁷Se
35	⁸⁰Br	⁷⁷Br
36	⁸¹Kr	⁷⁷Kr
37	⁸²Rb	⁷⁷Rb
38	⁸³Sr	⁷⁷Sr
39	⁸⁴Y	⁷⁷Y
40	⁸⁵Zr	⁷⁷Zr
41	⁸⁶Nb
42	⁸⁷Mo
43	⁸⁸Tc
44	⁸⁹Ru
45	⁹⁰Rh
46	⁹¹Pd
47	⁹²Ag