Europium-142
Properties and data of the isotope 142Eu.
See also: List of individual Europium isotopes (and general data sources).
General data
Name of the isotope:Europium-142; Eu-142Symbol:142Eu or 14263EuMass number A:142 (= number of nucleons)Atomic number Z:63 (= number of protons)Neutrons N:79Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.2539682539683 (= neutron-proton ratio)Neutron excess (N-Z):16Isotopic mass:141.92344(3) u (atomic weight of Europium-142)Nuclide mass:141.8888822 u (calculated nuclear mass without electrons)Mass excess:-71.31518 MeVMass defect:1.25406538 u (per nucleus)Nuclear binding energy:1168.15437708 MeV (per nucleus)
8.22643928 MeV (average binding energy per nucleon)Separation energy:SN = 9.46(4) MeV (first neutron)
SP = 2.67(3) MeV (first proton)Half-life:2.34(12) sDecay constant λ:0.29621674382904 s-1Specific activity α:1.265148196035 × 10+21 Bq g-1
34193194487.449 Ci g-1Spin and parity:
(nuclear angular momentum)1+Magnetic dipole moment:μ(μN) = + 1.536(19)Quadrupole moment Q:0.12(5) barn (100 fm2)Nuclear g-factor:gl = 1.536Charge radius:4.9607(91) femtometer fmYear of discovery:1966
Radioactive Decay
Half-life T½ = 2.34(12) s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 142Sm | 100 % | 4.35 MeV | |
Parent Nuclides
Direct parent isotope is: 142Gd.
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 |
|---|
| 142mEu | 460 keV | 1.223(8) min | 8- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 79) and isobaric (same nucleon number A = 142) with Europium-142. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 79 | Isobar A = 142 |
|---|
| 44 | 123Ru | |
| 45 | 124Rh | |
| 46 | 125Pd | |
| 47 | 126Ag | |
| 48 | 127Cd | |
| 49 | 128In | |
| 50 | 129Sn | |
| 51 | 130Sb | |
| 52 | 131Te | 142Te |
| 53 | 132I | 142I |
| 54 | 133Xe | 142Xe |
| 55 | 134Cs | 142Cs |
| 56 | 135Ba | 142Ba |
| 57 | 136La | 142La |
| 58 | 137Ce | 142Ce |
| 59 | 138Pr | 142Pr |
| 60 | 139Nd | 142Nd |
| 61 | 140Pm | 142Pm |
| 62 | 141Sm | 142Sm |
| 63 | 142Eu | 142Eu |
| 64 | 143Gd | 142Gd |
| 65 | 144Tb | 142Tb |
| 66 | 145Dy | 142Dy |
| 67 | 146Ho | 142Ho |
| 68 | 147Er | |
| 69 | 148Tm | |
| 70 | 149Yb | |
| 71 | 150Lu | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/europium-142
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