See also: List of individual Europium isotopes (and general data sources).
General data
Name of the isotope:Europium-148m; Eu-148mSymbol:148mEu or 148m63EuMass number A:148 (= number of nucleons)Atomic number Z:63 (= number of protons)Neutrons N:85Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3492063492063 (= neutron-proton ratio)Neutron excess (N-Z):22Excitation energy:720.4(3) keVIsotopic mass:147.918089(11) u (atomic weight of Europium-148m)Nuclide mass:147.8835312 u (calculated nuclear mass without electrons)Mass excess:-76.29961 MeVMass defect:1.311405876 u (per nucleus)Nuclear binding energy:1221.56670506 MeV (per nucleus) 8.25382909 MeV (average binding energy per nucleon)Half-life:162(8) nsDecay constant λ:4278686.2997527 s-1Specific activity α:1.741967553744 × 10+28 Bq g-1 4.708020415526 × 10+17 Ci g-1Spin and parity: (nuclear angular momentum)9+Magnetic dipole moment:μ(μN) = + 6.120(45)Nuclear g-factor:gl = 0.68
The following table shows the atomic nuclei that are isotonic (same neutron number N = 85) and isobaric (same nucleon number A = 148) with Europium-148m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
