Europium-146
Properties and data of the isotope 146Eu.
See also: list of Europium isotopes.
General data
Name of the isotope:Europium-146; Eu-146Symbol:146Eu or 14663EuMass number A:146 (= number of nucleons)Atomic number Z:63 (= number of protons)Neutrons N:83Isotopic mass:145.917211(6) u (atomic weight of Europium-146)Nuclide mass:145.8826532 u (calculated nuclear mass without electrons)Mass excess:-77.11746 MeVMass defect:1.294954044 u (per nucleus)Nuclear binding energy:1206.24192226 MeV (per nucleus)
8.26193097 MeV (average binding energy per nucleon)Separation energy:SN = 7.197(7) MeV (first neutron)
SP = 3.755(6) MeV (first proton)Half-life:4.61(3) dDecay constant λ:1.74024659697 × 10-6 s-1Specific activity α:7.227593198610 × 10+15 Bq g-1
195340.3567192 Ci g-1Spin and parity:
(nuclear angular momentum)4-Magnetic dipole moment:μ(μN) = + 1.422(6)Quadrupole moment Q:- 0.179(5) barn (100 fm2)Nuclear g-factor:gl = 0.3555Charge radius:4.9789(92) femtometer fmYear of discovery:1957
Radioactive Decay
Half-life T½ = 4.61(3) d respectively 3.98304 × 105 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC/β+ | 146Sm | 100 % | 3.879(7) MeV | |
Parent Nuclides
Direct parent isotopes are: 146Gd, 150Tb.
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 |
---|
146mEu | 666.33(11) keV | 235(3) μs | 9+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 83) and isobaric (same nucleon number A = 146) with Europium-146. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 83 | Isobar A = 146 |
46 | 129Pd | |
47 | 130Ag | |
48 | 131Cd | |
49 | 132In | |
50 | 133Sn | |
51 | 134Sb | |
52 | 135Te | |
53 | 136I | |
54 | 137Xe | 146Xe |
55 | 138Cs | 146Cs |
56 | 139Ba | 146Ba |
57 | 140La | 146La |
58 | 141Ce | 146Ce |
59 | 142Pr | 146Pr |
60 | 143Nd | 146Nd |
61 | 144Pm | 146Pm |
62 | 145Sm | 146Sm |
63 | 146Eu | 146Eu |
64 | 147Gd | 146Gd |
65 | 148Tb | 146Tb |
66 | 149Dy | 146Dy |
67 | 150Ho | 146Ho |
68 | 151Er | 146Er |
69 | 152Tm | 146Tm |
70 | 153Yb | |
71 | 154Lu | |
72 | 155Hf | |
73 | 156Ta | |
74 | 157W | |
External data and identifiers
Last update: 2023-05-08
Perma link: https://www.chemlin.org/isotope/europium-146
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