Isotopes of europium
List of isotopes
Bold for isotopes with half-lives longer than the age of the universe (nearly stable) Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe) primordial radionuclide Fission product Believed to undergo α decay to ¹⁴⁹Pm

Isotopes of europium

Section Title: List of isotopes
Table Section Text: Bold for isotopes with half-lives longer than the age of the universe (nearly stable) Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe) primordial radionuclide Fission product Believed to undergo α decay to ¹⁴⁹Pm

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)	daughter isotope(s)	nuclear spin and parity	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)

excitation energy

130Eu	63	67	129.96357(54)#	1.1(5) ms [0.9(+5−3) ms]	2+#

131Eu	63	68	130.95775(43)#	17.8(19) ms	3/2+

132Eu	63	69	131.95437(43)#	100# ms	β+	132Sm

p	131Sm

133Eu	63	70	132.94924(32)#	200# ms	β+	133Sm	11/2−#

134Eu	63	71	133.94651(21)#	0.5(2) s	β+	134Sm

β+, p (rare)	133Pm

135Eu	63	72	134.94182(32)#	1.5(2) s	β+	135Sm	11/2−#

β+, p	134Pm

136Eu	63	73	135.93960(21)#	3.3(3) s	β+ (99.91%)	136Sm	(7+)

β+, p (.09%)	135Pm

136mEu	0(500)# keV	3.8(3) s	β+ (99.91%)	136Sm	(3+)

β+, p (.09%)	135Pm

137Eu	63	74	136.93557(21)#	8.4(5) s	β+	137Sm	11/2−#

138Eu	63	75	137.93371(3)	12.1(6) s	β+	138Sm	(6−)

139Eu	63	76	138.929792(14)	17.9(6) s	β+	139Sm	(11/2)−

140Eu	63	77	139.92809(6)	1.51(2) s	β+	140Sm	1+

140mEu	210(15) keV	125(2) ms	IT (99%)	140Eu	5−#

β+(1%)	140Sm

141Eu	63	78	140.924931(14)	40.7(7) s	β+	141Sm	5/2+

141mEu	96.45(7) keV	2.7(3) s	IT (86%)	141Eu	11/2−

β+ (14%)	141Sm

142Eu	63	79	141.92343(3)	2.36(10) s	β+	142Sm	1+

142mEu	460(30) keV	1.223(8) min	β+	142Sm	8−

143Eu	63	80	142.920298(12)	2.59(2) min	β+	143Sm	5/2+

143mEu	389.51(4) keV	50.0(5) µs	11/2−

144Eu	63	81	143.918817(12)	10.2(1) s	β+	144Sm	1+

144mEu	1127.6(6) keV	1.0(1) µs	(8−)

145Eu	63	82	144.916265(4)	5.93(4) d	β+	145Sm	5/2+

145mEu	716.0(3) keV	490 ns	11/2−

146Eu	63	83	145.917206(7)	4.61(3) d	β+	146Sm	4−

146mEu	666.37(16) keV	235(3) µs	9+

147Eu	63	84	146.916746(3)	24.1(6) d	β+ (99.99%)	147Sm	5/2+

α (.0022%)	143Pm

148Eu	63	85	147.918086(11)	54.5(5) d	β+ (100%)	148Sm	5−

α (9.39×10−7%)	144Pm

149Eu	63	86	148.917931(5)	93.1(4) d	EC	149Sm	5/2+

150Eu	63	87	149.919702(7)	36.9(9) y	β+	150Sm	5(−)

150mEu	42.1(5) keV	12.8(1) h	β− (89%)	150Gd	0−

β+ (11%)	150Sm

IT (5×10−8%)	150Eu

151Eu	63	88	150.9198502(26)	4.62×1018 y	α	147Pm	5/2+	0.4781(6)

151mEu	196.245(10) keV	58.9(5) µs	11/2−

152Eu	63	89	151.9217445(26)	13.537(6) y	EC (72.09%), β+ (0.027%)	152Sm	3−

β− (27.9%)	152Gd

152m1Eu	45.5998(4) keV	9.3116(13) h	β− (72%)	152Gd	0−

β+ (28%)	152Sm

152m2Eu	65.2969(4) keV	0.94(8) µs	1−

152m3Eu	78.2331(4) keV	165(10) ns	1+

152m4Eu	89.8496(4) keV	384(10) ns	4+

152m5Eu	147.86(10) keV	96(1) min	8−

153Eu	63	90	152.9212303(26)	Observationally Stable	5/2+	0.5219(6)

154Eu	63	91	153.9229792(26)	8.593(4) y	β− (99.98%)	154Gd	3−

EC (.02%)	154Sm

154m1Eu	145.3(3) keV	46.3(4) min	IT	154Eu	(8−)

154m2Eu	68.1702(4) keV	2.2(1) µs	2+

155Eu	63	92	154.9228933(27)	4.7611(13) y	β−	155Gd	5/2+

156Eu	63	93	155.924752(6)	15.19(8) d	β−	156Gd	0+

157Eu	63	94	156.925424(6)	15.18(3) h	β−	157Gd	5/2+

158Eu	63	95	157.92785(8)	45.9(2) min	β−	158Gd	(1−)

159Eu	63	96	158.929089(8)	18.1(1) min	β−	159Gd	5/2+

160Eu	63	97	159.93197(22)#	38(4) s	β−	160Gd	1(−)

161Eu	63	98	160.93368(32)#	26(3) s	β−	161Gd	5/2+#

162Eu	63	99	161.93704(32)#	10.6(10) s	β−	162Gd

163Eu	63	100	162.93921(54)#	6# s	β−	163Gd	5/2+#

164Eu	63	101	163.94299(64)#	2# s	β−	164Gd

165Eu	63	102	164.94572(75)#	1# s	β−	165Gd	5/2+#

166Eu	63	103	165.94997(86)#	400# ms	β−	166Gd

167Eu	63	104	166.95321(86)#	200# ms	β−	167Gd	5/2+#

Sentence(s)

¹⁵⁰ᵐEu has a half life of 12.8 hours and ¹⁵²ᵐ¹Eu has a half life of 9.3116 hours.

final_sentence: ¹⁵⁰ᵐEu has a half life of 12.8 hours and ¹⁵²ᵐ¹Eu has a half life of 9.3116 hours.