See also: List of individual Germanium isotopes (and general data sources).
General data
Name of the isotope:Germanium-61; Ge-61Symbol:61Ge or 6132GeMass number A:61 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:29Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):0.90625 (= neutron-proton ratio)Neutron excess (N-Z):-3Isotopic mass:60.96419(32) u (atomic weight of Germanium-61)Nuclide mass:60.946636 u (calculated nuclear mass without electrons)Mass excess:-33.3568 MeVMass defect:0.537493588 u (per nucleus)Nuclear binding energy:500.67205226 MeV (per nucleus) 8.20773856 MeV (average binding energy per nucleon)Separation energy:SN = 14.34(42) MeV (first neutron) SP = 1.06(36) MeV (first proton)Half-life:44(6) msDecay constant λ:15.753345012726 s-1Specific activity α:1.556140762429 × 10+23 Bq g-1 4205785844403.2 Ci g-1Spin and parity: (nuclear angular momentum)(3/2-)Mirror nucleus:Copper-61Year of discovery:1987
Radioactive Decay
Half-life T½ = 44(6) ms respectively 4.4 × 10-2 seconds s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
EC/β+
61Ga
< 38 %
13.77(30) MeV
EC, p
60Zn
> 62 %
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 29) and isobaric (same nucleon number A = 61) with Germanium-61. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
