See also: List of individual Germanium isotopes (and general data sources).
General data
Name of the isotope:Germanium-65; Ge-65Symbol:65Ge or 6532GeMass number A:65 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:33Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.03125 (= neutron-proton ratio)Neutron excess (N-Z):1Isotopic mass:64.9393681(23) u (atomic weight of Germanium-65)Nuclide mass:64.9218141 u (calculated nuclear mass without electrons)Mass excess:-56.47825 MeVMass defect:0.596975152 u (per nucleus)Nuclear binding energy:556.07877224 MeV (per nucleus) 8.55505803 MeV (average binding energy per nucleon)Separation energy:SN = 10.234(4) MeV (first neutron) SP = 4.9344(26) MeV (first proton)Half-life:30.9(5) sDecay constant λ:0.022431947590937 s-1Specific activity α:2.080222673333 × 10+20 Bq g-1 5622223441.4416 Ci g-1Spin and parity: (nuclear angular momentum)3/2-Mirror nucleus:Arsenic-65Year of discovery:1972
Radioactive Decay
Half-life T½ = 30.9(5) s respectively 3.09 × 101 seconds s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
EC/β+
65Ga
99.9 %
6.1793(23) MeV
EC, p
65Zn
0.011(3) %
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 33) and isobaric (same nucleon number A = 65) with Germanium-65. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
