Vanadium-45m is an excited nuclear state of the nuclide 45V, characterized by a defined excitation energy (56.8 keV). Its spin and parity quantum numbers differ from those of the ground state (gs). Simultaneously, this metastable nuclear isomer possesses an independent, experimentally measurable lifetime: decay occurs via an isomeric transition to V-45 in the ground state with a half-life of approximately 512 nanoseconds.
See also: List of individual Vanadium isotopes (and general data sources).
General data
Name of the isotope:Vanadium-45m; V-45mSymbol:45mV or 45m23VMass number A:45 (= number of nucleons)Atomic number Z:23 (= number of protons)Neutrons N:22Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):0.95652173913043 (= neutron-proton ratio)Neutron excess (N-Z):-1Excitation energy:56.8(6) keVIsotopic mass:44.9657685(9) u (atomic weight of Vanadium-45m)Nuclide mass:44.9531514 u (calculated nuclear mass without electrons)Mass excess:-31.88644 MeVMass defect:0.404835388 u (per nucleus)Nuclear binding energy:377.10173491 MeV (per nucleus) 8.38003855 MeV (average binding energy per nucleon)Half-life:512(13) nsDecay constant λ:1353803.0870311 s-1Specific activity α:1.813110956042 × 10+28 Bq g-1 4.90029988119 × 10+17 Ci g-1Spin and parity: (nuclear angular momentum)(3/2-)Year of discovery:1980
The following table shows the atomic nuclei that are isotonic (same neutron number N = 22) and isobaric (same nucleon number A = 45) with Vanadium-45m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
