Europium-151
Properties and data of the isotope 151Eu.
See also: list of Europium isotopes.
General data
Name of the isotope:Europium-151; Eu-151Symbol:151Eu or 15163EuMass number A:151 (= number of nucleons)Atomic number Z:63 (= number of protons)Neutrons N:88Isotopic mass:150.9198566(13) u (atomic weight of Europium-151)Nuclide mass:150.8852988 u (calculated nuclear mass without electrons)Mass excess:-74.6531 MeVMass defect:1.335633024 u (per nucleus)Nuclear binding energy:1244.13414806 MeV (per nucleus)
8.23929899 MeV (average binding energy per nucleon)Separation energy:SN = 7.932(6) MeV (first neutron)
SP = 4.8907(5) MeV (first proton)Half-life:1.7 × 1018 aDecay constant λ:1.292914877040 × 10-26 s-1Specific activity α:5.190743672963 × 10-5 Bq g-1
1.402903695395 × 10-15 Ci g-1Spin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μN) = + 3.4717(6)Charge radius:5.0522(46) femtometer fmYear of discovery:1933
Radioactive Decay
Half-life T½ = 1.7 × 1018 a respectively 5.36112 × 1025 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 147Pm | ? | 1.9640(11) MeV | |
Parent Nuclides
Direct parent isotopes are: 151Gd, 151Sm.
Occurrence
Comparison of the natural Europium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
| | Atomic Mass ma | Quantity | Half-life | Spin |
|---|
Europium
Isotopic mixture | 151.964 u | 100 % | | |
| Isotope 151Eu | 150.9198566(13) u | 47.81(6) % | 1.7 × 1018 a | 5/2+ |
| Isotope 153Eu | 152.92124(2) u | 52.19(6) % | stable | 5/2+ |
NMR data
Nuclear magnetic properties of the NMR active Nuclide 151Eu
Isotope:151Eu-NMRQuantity:47.81(6) %Spin:5/2+Nuclearmagnetic moment
μ/μN:+ 3.4717(6)Gyromagnetic ratio γ:6.5477 · 107 rad T-1 s-1Nuclear g-factor:gl = 1.38868Quadrupole moment Q:0.903(10) barn (100 fm2)Line width parameter (factor):l = 2609.31 fm4Resonance frequency:v0 = 10.5856 at 1 TRelative Sensitivity:0.17929 (H0 = const.)
2.9006 (v0 = const.)
[related to 1H = 1.000]
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 |
|---|
| 151mEu | 196.245(10) | 58.9(5) µs | 11/2- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 88) and isobaric (same nucleon number A = 151) with Europium-151. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 88 | Isobar A = 151 |
|---|
| 49 | 137In | |
| 50 | 138Sn | |
| 51 | 139Sb | |
| 52 | 140Te | |
| 53 | 141I | |
| 54 | 142Xe | |
| 55 | 143Cs | 151Cs |
| 56 | 144Ba | 151Ba |
| 57 | 145La | 151La |
| 58 | 146Ce | 151Ce |
| 59 | 147Pr | 151Pr |
| 60 | 148Nd | 151Nd |
| 61 | 149Pm | 151Pm |
| 62 | 150Sm | 151Sm |
| 63 | 151Eu | 151Eu |
| 64 | 152Gd | 151Gd |
| 65 | 153Tb | 151Tb |
| 66 | 154Dy | 151Dy |
| 67 | 155Ho | 151Ho |
| 68 | 156Er | 151Er |
| 69 | 157Tm | 151Tm |
| 70 | 158Yb | 151Yb |
| 71 | 159Lu | 151Lu |
| 72 | 160Hf | |
| 73 | 161Ta | |
| 74 | 162W | |
| 75 | 163Re | |
| 76 | 164Os | |
| 77 | 165Ir | |
| 78 | 166Pt | |
External data and identifiers
Last update: 2023-01-09
Perma link: https://www.chemlin.org/isotope/europium-151
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