Europium-140
Properties and data of the isotope 140Eu.
See also: List of individual Europium isotopes (and general data sources).
General data
Name of the isotope:Europium-140; Eu-140Symbol:140Eu or 14063EuMass number A:140 (= number of nucleons)Atomic number Z:63 (= number of protons)Neutrons N:77Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.2222222222222 (= neutron-proton ratio)Neutron excess (N-Z):14Isotopic mass:139.92809(6) u (atomic weight of Europium-140)Nuclide mass:139.8935322 u (calculated nuclear mass without electrons)Mass excess:-66.98373 MeVMass defect:1.232085548 u (per nucleus)Nuclear binding energy:1147.68029545 MeV (per nucleus)
8.1977164 MeV (average binding energy per nucleon)Separation energy:SN = 9.66(5) MeV (first neutron)
SP = 1.89(5) MeV (first proton)Half-life:1.51(2) sDecay constant λ:0.45903786792049 s-1Specific activity α:1.988770288246 × 10+21 Bq g-1
53750548330.978 Ci g-1Spin and parity:
(nuclear angular momentum)1+Magnetic dipole moment:μ(μN) = + 1.365(13)Quadrupole moment Q:0.31(4) barn (100 fm2)Nuclear g-factor:gl = 1.365Charge radius:4.9695(91) femtometer fmYear of discovery:1982
Radioactive Decay
Half-life T½ = 1.51(2) s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 140Sm | 100 % | 8.47(5) MeV | |
Parent Nuclides
Direct parent isotope is: 140Gd.
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 |
|---|
| 140mEu | 210(15) keV | 125(2) ms | (5-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 77) and isobaric (same nucleon number A = 140) with Europium-140. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 77 | Isobar A = 140 |
|---|
| 43 | 120Tc | |
| 44 | 121Ru | |
| 45 | 122Rh | |
| 46 | 123Pd | |
| 47 | 124Ag | |
| 48 | 125Cd | |
| 49 | 126In | |
| 50 | 127Sn | 140Sn |
| 51 | 128Sb | 140Sb |
| 52 | 129Te | 140Te |
| 53 | 130I | 140I |
| 54 | 131Xe | 140Xe |
| 55 | 132Cs | 140Cs |
| 56 | 133Ba | 140Ba |
| 57 | 134La | 140La |
| 58 | 135Ce | 140Ce |
| 59 | 136Pr | 140Pr |
| 60 | 137Nd | 140Nd |
| 61 | 138Pm | 140Pm |
| 62 | 139Sm | 140Sm |
| 63 | 140Eu | 140Eu |
| 64 | 141Gd | 140Gd |
| 65 | 142Tb | 140Tb |
| 66 | 143Dy | 140Dy |
| 67 | 144Ho | 140Ho |
| 68 | 145Er | |
| 69 | 146Tm | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/europium-140
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