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Europium-146

Properties and data of the isotope 146Eu.


Contents

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-1
Spin 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
DaughterProbabilityDecay energyγ energy
(intensity)
EC/β+146Sm100 %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 IsomerExcitation EnergyHalf-lifeSpin
146mEu666.33(11) keV235(3) μs9+

 

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.

 

ZIsotone N = 83Isobar A = 146
46129Pd
47130Ag
48131Cd
49132In
50133Sn
51134Sb
52135Te
53136I
54137Xe146Xe
55138Cs146Cs
56139Ba146Ba
57140La146La
58141Ce146Ce
59142Pr146Pr
60143Nd146Nd
61144Pm146Pm
62145Sm146Sm
63146Eu146Eu
64147Gd146Gd
65148Tb146Tb
66149Dy146Dy
67150Ho146Ho
68151Er146Er
69152Tm146Tm
70153Yb
71154Lu
72155Hf
73156Ta
74157W

 

External data and identifiers

Adopted Levels, Gammas:NuDat 146Eu

 


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Last update: 2023-05-08


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