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Periodic Table of Elements

Eu - Europium

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Nuclides / Isotopes

Nuc- lide	Atomic Mass	NN	Abun %	Spin	Half Life	DM	DT	BR %	Decay Energy (MeV)
Eu131		68	Syn	3/2+, 5/2+	26ms	P
Eu132	131.954	69	Syn
Eu133	132.949	70	Syn
Eu134	133.946	71	Syn		0.5s	ε + P	Pm133	>0
					0.5s	ε	Sm134
Eu135	134.942	72	Syn		1.5s	ε	Sm135		8.700
					1.5s	ε + P	Pm134		5.00
Eu136	135.94	73	Syn	7+	3.3s	ε + P	Pm135	0.09	6.500
					3.3s	ε	Sm136		10.400
meta state 0.000MeV			Syn	3+	3.7s	ε + P	Pm135	0.09	6.500
					3.7s	ε	Sm136		10.400
Eu137	136.935	74	Syn	11/2-	11s	ε	Sm137		7.500
Eu138	137.933	75	Syn	6-	12.1s	ε	Sm138		9.200
Eu139	138.93	76	Syn	11/2-	17.9s	ε	Sm139		6.700
Eu140	139.9281	77	Syn	1+	1.51s	ε	Sm140		8.400
meta state 0.185MeV			Syn	5-	125ms	ε	Sm140	<1	8.585
					125ms	IT			0.185
Eu141	140.9249	78	Syn	5/2+	40.7s	ε	Sm141		5.550
meta state 0.096MeV			Syn	11/2-	2.7s	IT		87	0.096
					2.7s	ε	Sm141	13	5.646
Eu142	141.9234	79	Syn	1+	2.34s	ε	Sm142		7.640
meta state 0.000MeV			Syn	8-	1.22m	ε	Sm142		7.640
Eu143	142.9203	80	Syn	5/2+	2.63m	ε	Sm143		5.275
Eu144	143.9188	81	Syn	1+	10.2s	ε	Sm144		6.315
Eu145	144.9163	82	Syn	5/2+	5.93d	ε	Sm145		2.660
Eu146	145.9172	83	Syn	4-	4.61d	ε	Sm146		3.878
Eu147	146.9167	84	Syn	5/2+	24.1d	α	Pm143	0.0022	2.990
					24.1d	ε	Sm147		1.722
Eu148	147.9182	85	Syn	5-	54.5d	α	Pm144	9.4E^-7	2.761
					54.5d	ε	Sm148		3.107
Eu149	148.9179	86	Syn	5/2+	93.1d	ε	Sm149		0.692
Eu150	149.9197	87	Syn	5-	36.9y	ε	Sm150		2.261
meta state 0.042MeV			Syn	0-	12.8h	β^-	Gd150	89	1.013
					12.8h	ε	Sm150	11	2.303
					12.8h	IT	Eu150		0.042
Eu151	150.9199	88	47.8	5/2+	Stable
Eu152	151.9217	89	Syn	3-	13.537y	ε	Sm152	72.1	1.874
					13.537y	β^-	Gd152	27.9	1.819
meta state 0.045MeV			Syn	0-	9.3116h	β^-	Gd152	72	1.865
					9.3116h	ε	Sm152	28	1.920
meta state 0.147MeV			Syn	8-	96m	IT			0.148
Eu153	152.9212	90	52.2	5/2+	Stable
Eu154	153.923	91	Syn	3-	8.593y	β^-	Gd154	99.98	1.969
					8.593y	ε	Sm154	0.02	0.717
meta state 0.145MeV			Syn	8-	46.3m	IT			0.145
Eu155	154.9229	92	Syn	5/2+	4.7611y	β^-	Gd155		0.252
Eu156	155.9248	93	Syn	0+	15.19d	β^-	Gd156		2.451
Eu157	156.9254	94	Syn	5/2+	15.18h	β^-	Gd157		1.363
Eu158	157.9278	95	Syn	1-	45.9m	β^-	Gd158		3.490
Eu159	158.9291	96	Syn	5/2+	18.1m	β^-	Gd159		2.514
Eu160	159.932	97	Syn	1-	38s	β^-	Gd160		4.580
Eu161	160.934	98	Syn		26s	β^-	Gd161		3.700
Eu162	161.937	99	Syn		10.6s	β^-	Gd162		5.600
Eu163	162.939	100	Syn
Eu164	163.943	101	Syn
Eu165	164.946	102	Syn
Eu166	165.95	103	Syn
Eu167	166.953	104	Syn

Nuclide	Potential Parent Nuclides
Eu131	None known
Eu132	None known
Eu133	None known
Eu134	None known
Eu135	None known
Eu136	None known
meta state 0.000MeV	None known
Eu137	Gd137 (Syn)
Eu138	None known
Eu139	Gd139 (Syn) Tb140 (Syn)
Eu140	Gd140 (Syn)
meta state 0.185MeV	None known
Eu141	Gd141 (Syn) Gd141m (Syn) Tb142 (Syn) Tb142m (Syn)
meta state 0.096MeV	None known
Eu142	Gd142 (Syn)
meta state 0.000MeV	None known
Eu143	Gd143 (Syn) Gd143m (Syn)
Eu144	Gd144 (Syn)
Eu145	Gd145 (Syn) Gd145m (Syn) Tb149 (Syn) Tb149m (Syn)
Eu146	Gd146 (Syn) Tb150 (Syn)
Eu147	Gd147 (Syn) Tb151 (Syn)
Eu148	Tb152 (Syn)
Eu149	Gd149 (Syn)
Eu150	Eu150m (Syn)
meta state 0.042MeV	None known
Eu151	Gd151 (Syn) Sm151 (Syn)
Eu152	None known
meta state 0.045MeV	None known
meta state 0.147MeV	None known
Eu153	Gd153 (Syn) Sm153 (Syn)
Eu154	None known
meta state 0.145MeV	None known
Eu155	Sm155 (Syn)
Eu156	Sm156 (Syn)
Eu157	Sm157 (Syn)
Eu158	Sm158 (Syn)
Eu159	Sm159 (Syn)
Eu160	Sm160 (Syn)
Eu161	None known
Eu162	None known
Eu163	None known
Eu164	None known
Eu165	None known
Eu166	None known
Eu167	None known
Key: NN = Number of Neutrons Abun % = Natural Abundance (as a percentage) Syn = Synthetic Nuclide (does not occur in nature) DM = Decay Mode α = Alpha emission β^- = Beta emission β^- β^- = Double beta decay β⁺ = Positron emission ε = Electron Capture IT = Isomeric Transition N = Neutron emission P = Proton emission SF = Spontaneous Fission DT = Decays To BR % = Branch Ratio (as a percentage)

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Periodic Table of Elements

Eu - Europium

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