Europium-143m

Properties and data of the isotope ¹⁴³Eu.

Content

General data

Name of the isotope:Europium-143m; Eu-143mSymbol:¹⁴³Eu or 14363EuMass number A:143 (= number of nucleons)Atomic number Z:63 (= number of protons)Neutrons N:80Isotopic mass:142.920299(12) u (atomic weight of Europium-143m)
Excitation energy: 389.51(4) keVNuclide mass:142.8857412 u (calculated nuclear mass without electrons)Mass excess:-74.241 MeVMass defect:1.265871296 u (per nucleus)Nuclear binding energy:1179.151517 MeV (per nucleus)
8.2458148 MeV (average binding energy per nucleon)Half-life:50.0(5) μsDecay constant λ:13862.943611199 s^-1Specific activity α:5.879197123943 × 10⁺²⁵ Bq g^-1
1.588972195660 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)11/2-

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
¹⁴³Eu		2.59(2) min	5/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 80) and isobaric (same nucleon number A = 143) with Europium-143m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 80	Isobar A = 143
44	¹²⁴Ru
45	¹²⁵Rh
46	¹²⁶Pd
47	¹²⁷Ag
48	¹²⁸Cd
49	¹²⁹In
50	¹³⁰Sn
51	¹³¹Sb
52	¹³²Te	¹⁴³Te
53	¹³³I	¹⁴³I
54	¹³⁴Xe	¹⁴³Xe
55	¹³⁵Cs	¹⁴³Cs
56	¹³⁶Ba	¹⁴³Ba
57	¹³⁷La	¹⁴³La
58	¹³⁸Ce	¹⁴³Ce
59	¹³⁹Pr	¹⁴³Pr
60	¹⁴⁰Nd	¹⁴³Nd
61	¹⁴¹Pm	¹⁴³Pm
62	¹⁴²Sm	¹⁴³Sm
63	¹⁴³Eu	¹⁴³Eu
64	¹⁴⁴Gd	¹⁴³Gd
65	¹⁴⁵Tb	¹⁴³Tb
66	¹⁴⁶Dy	¹⁴³Dy
67	¹⁴⁷Ho	¹⁴³Ho
68	¹⁴⁸Er	¹⁴³Er
69	¹⁴⁹Tm
70	¹⁵⁰Yb
71	¹⁵¹Lu