See also: List of individual Europium isotopes (and general data sources).
General data
Name of the isotope:Europium-148; Eu-148Symbol:148Eu or 14863EuMass 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):22Isotopic mass:147.918089(11) u (atomic weight of Europium-148)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)Separation energy:SN = 6.826(10) MeV (first neutron) SP = 4.322(10) MeV (first proton)Half-life:54.5(5) dDecay constant λ:1.472025103125 × 10-7 s-1Specific activity α:5.993007639030 × 10+14 Bq g-1 16197.317943326 Ci g-1Spin and parity: (nuclear angular momentum)5-Magnetic dipole moment:μ(μN) = + 2.340(10)Quadrupole moment Q:+0.35(6) barn (100 fm2)Nuclear g-factor:gl = 0.468Charge radius:5.0045(97) femtometer fmYear of discovery:1951
Radioactive Decay
Half-life T½ = 54.5(5) d respectively 4.708800 × 106 seconds s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
EC/β+
148Sm
> 99 %
3.037(10) MeV
α
144Pm
<< 1 %
2.692(10) MeV
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 85) and isobaric (same nucleon number A = 148) with Europium-148. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
