Europium-148
Properties and data of the isotope 148Eu.
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:6.030437088698 × 10+14 Bq g-1
16298.478618105 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.
| Nuclear Isomer | Excitation Energy | Half-life | Spin |
|---|
| 148mEu | 720.4(3) keV | 162(8) ns | 9+ |
Isotones and Isobars
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.
| Z | Isotone N = 85 | Isobar A = 148 |
|---|
| 47 | 132Ag | |
| 48 | 133Cd | |
| 49 | 134In | |
| 50 | 135Sn | |
| 51 | 136Sb | |
| 52 | 137Te | |
| 53 | 138I | |
| 54 | 139Xe | 148Xe |
| 55 | 140Cs | 148Cs |
| 56 | 141Ba | 148Ba |
| 57 | 142La | 148La |
| 58 | 143Ce | 148Ce |
| 59 | 144Pr | 148Pr |
| 60 | 145Nd | 148Nd |
| 61 | 146Pm | 148Pm |
| 62 | 147Sm | 148Sm |
| 63 | 148Eu | 148Eu |
| 64 | 149Gd | 148Gd |
| 65 | 150Tb | 148Tb |
| 66 | 151Dy | 148Dy |
| 67 | 152Ho | 148Ho |
| 68 | 153Er | 148Er |
| 69 | 154Tm | 148Tm |
| 70 | 155Yb | 148Yb |
| 71 | 156Lu | |
| 72 | 157Hf | |
| 73 | 158Ta | |
| 74 | 159W | |
| 75 | 160Re | |
| 76 | 161Os | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/europium-148
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