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Europium-151

Properties and data of the isotope 151Eu.


Content

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-1
Spin 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 modeDaughterProbabilityDecay energyγ energy
(intensity)
α147Pm?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 maQuantityHalf-lifeSpin
Europium
Isotopic mixture
151.964 u100 %
Isotope 151Eu150.9198566(13) u47.81(6) %1.7 × 1018 a5/2+
Isotope 153Eu152.92124(2) u52.19(6) %stable5/2+

 

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 IsomerExcitation EnergyHalf-lifeSpin
151mEu196.245(10)58.9(5) ┬Ás11/2-

 

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.

 

OZIsotone N = 88Isobar A = 151
49137In
50138Sn
51139Sb
52140Te
53141I
54142Xe
55143Cs151Cs
56144Ba151Ba
57145La151La
58146Ce151Ce
59147Pr151Pr
60148Nd151Nd
61149Pm151Pm
62150Sm151Sm
63151Eu151Eu
64152Gd151Gd
65153Tb151Tb
66154Dy151Dy
67155Ho151Ho
68156Er151Er
69157Tm151Tm
70158Yb151Yb
71159Lu151Lu
72160Hf
73161Ta
74162W
75163Re
76164Os
77165Ir
78166Pt

 

External data and identifiers

Adopted Levels, Gammas:NuDat 151Eu

 


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Last update: 2023-01-09


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