Europium-154m2

Properties and data of the isotope ^154m2Eu.

Contents

See also: List of individual Europium isotopes (and general data sources).

General data

Name of the isotope:Europium-154m2; Eu-154m2Symbol:^154m2Eu or 154m263EuMass number A:154 (= number of nucleons)Atomic number Z:63 (= number of protons)Neutrons N:91Isotopic mass:153.9229860(14) u (atomic weight of Europium-154m2)
Excitation energy: 145.3(3) keVNuclide mass:153.8884282 u (calculated nuclear mass without electrons)Mass excess:-71.73808 MeVMass defect:1.358498372 u (per nucleus)Nuclear binding energy:1265.43308253 MeV (per nucleus)
8.21709794 MeV (average binding energy per nucleon)Half-life:46.3(4) minDecay constant λ:0.00024951302395966 s^-1Specific activity α:9.820931873685 × 10⁺¹⁷ Bq g^-1
26543059.118069 Ci g^-1Spin and parity:
(nuclear angular momentum)8-

Radioactive Decay

Half-life T_½ = 46.3(4) min (minutes) respectively 2.778 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁵⁴Eu	100 %

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
¹⁵⁴Eu		8.601(10) a	3-
^154m1Eu	68.1702(4) keV	2.2(1) μs	2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 91) and isobaric (same nucleon number A = 154) with Europium-154m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 91	Isobar A = 154
52	¹⁴³Te
53	¹⁴⁴I
54	¹⁴⁵Xe
55	¹⁴⁶Cs
56	¹⁴⁷Ba
57	¹⁴⁸La	¹⁵⁴La
58	¹⁴⁹Ce	¹⁵⁴Ce
59	¹⁵⁰Pr	¹⁵⁴Pr
60	¹⁵¹Nd	¹⁵⁴Nd
61	¹⁵²Pm	¹⁵⁴Pm
62	¹⁵³Sm	¹⁵⁴Sm
63	¹⁵⁴Eu	¹⁵⁴Eu
64	¹⁵⁵Gd	¹⁵⁴Gd
65	¹⁵⁶Tb	¹⁵⁴Tb
66	¹⁵⁷Dy	¹⁵⁴Dy
67	¹⁵⁸Ho	¹⁵⁴Ho
68	¹⁵⁹Er	¹⁵⁴Er
69	¹⁶⁰Tm	¹⁵⁴Tm
70	¹⁶¹Yb	¹⁵⁴Yb
71	¹⁶²Lu	¹⁵⁴Lu
72	¹⁶³Hf	¹⁵⁴Hf
73	¹⁶⁴Ta
74	¹⁶⁵W
75	¹⁶⁶Re
76	¹⁶⁷Os
77	¹⁶⁸Ir
78	¹⁶⁹Pt
79	¹⁷⁰Au
80	¹⁷¹Hg