Europium-152
Properties and data of the isotope 152Eu.
Eu-152 is a radioisotope of the chemical element Europium. The atomic nucleus of the nuclide is composed of 89 neutrons and 63 protons; this results in a mass number of 152.
See also: list of Europium isotopes.
General data
Name of the isotope:Europium-152; Eu-152Symbol:152Eu or 15263EuMass number A:152 (= number of nucleons)Atomic number Z:63 (= number of protons)Neutrons N:89Isotopic mass:151.9217510(13) u (atomic weight of Europium-152)Nuclide mass:151.8871932 u (calculated nuclear mass without electrons)Mass excess:-72.88847 MeVMass defect:1.34240354 u (per nucleus)Nuclear binding energy:1250.44084309 MeV (per nucleus)
8.22658449 MeV (average binding energy per nucleon)Separation energy:SN = 6.30672(10) MeV (first neutron)
SP = 5.6010(5) MeV (first proton)Half-life:13.517(9) aDecay constant λ:1.626067389930 × 10-9 s-1Specific activity α:6485037662192.3 Bq g-1
175.27128816736 Ci g-1Spin and parity:
(nuclear angular momentum)3-Magnetic dipole moment:μ(μN) = - 1.9401(8)Quadrupole moment Q:+ 2.71(3) barn (100 fm2)Nuclear g-factor:gl = -0.6467Charge radius:5.1064(66) femtometer fmYear of discovery:1938
Radioactive Decay
Half-life T½ = 13.517(9) a respectively 4.26272112 × 108 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC/β+ | 152Sm | 72.08(13) % | 1.8743(18) MeV | |
β- | 152Gd | 27.92(13) % | 1.8187(7) MeV | |
The diagram below shows a calculated spectrum with the most intense gamma emissions of the isotope europium-152:
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 |
---|
152m1Eu | 45.5998(4) keV | 9.3116(13) h | 0- |
152m2Eu | 65.2969(4) keV | 0.94(8) μs | 1- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 89) and isobaric (same nucleon number A = 152) with Europium-152. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 89 | Isobar A = 152 |
50 | 139Sn | |
51 | 140Sb | |
52 | 141Te | |
53 | 142I | |
54 | 143Xe | |
55 | 144Cs | |
56 | 145Ba | 152Ba |
57 | 146La | 152La |
58 | 147Ce | 152Ce |
59 | 148Pr | 152Pr |
60 | 149Nd | 152Nd |
61 | 150Pm | 152Pm |
62 | 151Sm | 152Sm |
63 | 152Eu | 152Eu |
64 | 153Gd | 152Gd |
65 | 154Tb | 152Tb |
66 | 155Dy | 152Dy |
67 | 156Ho | 152Ho |
68 | 157Er | 152Er |
69 | 158Tm | 152Tm |
70 | 159Yb | 152Yb |
71 | 160Lu | 152Lu |
72 | 161Hf | |
73 | 162Ta | |
74 | 163W | |
75 | 164Re | |
76 | 165Os | |
77 | 166Ir | |
78 | 167Pt | |
External data and identifiers
CAS:14683-23-9InChI Key:OGPBJKLSAFTDLK-IGMARMGPSA-NSMILES:[152Eu]PubChem:ID 104907Adopted Levels, Gammas:NuDat 152Eu
Last update: 2023-10-16
Perma link: https://www.chemlin.org/isotope/europium-152
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