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Isotopes of Europium (Z=63)
Isotope	Half-life	Spin Parity	Decay Mode(s) or Abundance
¹³¹Eu	26 ms	(3/2+,5/2+)	%P=100
¹³²Eu			%EC+%B+=100
¹³³Eu
¹³⁴Eu	0.5 s		%EC+%B+=100, %ECP > 0
¹³⁵Eu	1.5 s		%EC+%B+=100, %ECP=?
¹³⁶Eu	3.3 s	(7+)	%EC+%B+=100, %ECP=0.09
^136m1Eu	3.7 s	(3+)	%EC+%B+=100, %ECP=0.09
¹³⁷Eu	11 s	(11/2-)	%EC+%B+=100
¹³⁸Eu	12.1 s	(6-)	%EC+%B+=100
¹³⁹Eu	17.9 s	(11/2)-	%EC+%B+=100
¹⁴⁰Eu	1.51 s	1+	%EC+%B+=100
^140m1Eu	125 ms	(5-)	%IT=100 , %EC+%B+ < 1
¹⁴¹Eu	40.7 s	5/2+	%EC+%B+=100
^141m1Eu	2.7 s	11/2-	%EC+%B+=13 +4-2 , %IT=87 +2-4
¹⁴²Eu	2.34 s	1+	%EC+%B+=100
^142m1Eu	1.22 m	8-	%EC+%B+=100
¹⁴³Eu	2.63 m	5/2+	%EC+%B+=100
¹⁴⁴Eu	10.2 s	1+	%EC+%B+=100
¹⁴⁵Eu	5.93 d	5/2+	%EC+%B+=100
¹⁴⁶Eu	4.61 d	4-	%EC+%B+=100
¹⁴⁷Eu	24.1 d	5/2+	%EC+B+=100, %A=0.0022 6
¹⁴⁸Eu	54.5 d	5-	%EC+%B+=100, %A=9.4E-7 28
¹⁴⁹Eu	93.1 d	5/2+	%EC=100
¹⁵⁰Eu	36.9 y	5(-)	%EC+%B+=100
^150m1Eu	12.8 h	0-	%EC+%B+=11 2, %B-=89 2 , %IT < 5E-8
¹⁵¹Eu	stable	5/2+	%Abundance=47.8 15
¹⁵²Eu	13.537 y	3-	%EC=72.1 3 , %B-=27.9 3
^152m1Eu	9.3116 h	0-	%EC+%B+=28 4 , %B-=72 4
^152m2Eu	96 m	8-	%IT=100
¹⁵³Eu	stable	5/2+	%Abundance=52.2 15
¹⁵⁴Eu	8.593 y	3-	%B-=99.98 1, %EC+%B+=0.02 1
^154m1Eu	46.3 m	(8-)	%IT=100
¹⁵⁵Eu	4.7611 y	5/2+	%B-=100
¹⁵⁶Eu	15.19 d	0+	%B-=100
¹⁵⁷Eu	15.18 h	5/2+	%B-=100
¹⁵⁸Eu	45.9 m	(1-)	%B-=100
¹⁵⁹Eu	18.1 m	5/2+	%B-=100
¹⁶⁰Eu	38 s	1(-)	%B-=100
¹⁶¹Eu	26 s		%B-=100
¹⁶²Eu	10.6 s		%B-=100
¹⁶³Eu
¹⁶⁴Eu
¹⁶⁵Eu
¹⁶⁶Eu
¹⁶⁷Eu

Isotopes of Europium (Z=63)