Isotopes of europium

Isotopes of europium (₆₃Eu)
β−	152Gd
talk edit;

Naturally occurring

meta states

, with the most stable being ^150mEu (t_1/2 12.8 hours), ^152m1Eu (t_1/2 9.3116 hours) and ^152m2Eu (t_1/2 96 minutes).

The primary

decay mode before the most abundant stable isotope, ¹⁵³Eu, is electron capture, and the primary mode after is beta decay. The primary decay products before ¹⁵³Eu are isotopes of samarium and the primary products after are isotopes of gadolinium

.

List of isotopes

Nuclide ^{[n 1]}	Z	N	Isotopic mass (Da) ^{[n 2]}^{[n 3]}	Half-life ^{[n 4]}^{[n 5]}	Decay mode ^{[n 6]}	Daughter isotope ^{[n 7]}^{[n 8]}	Spin and parity ^{[n 9]}^{[n 5]}	Natural abundance (mole fraction)
Nuclide ^{[n 1]}	Excitation energy^{[n 5]}			Half-life ^{[n 4]}^{[n 5]}	Decay mode ^{[n 6]}	Daughter isotope ^{[n 7]}^{[n 8]}	Spin and parity ^{[n 9]}^{[n 5]}	Normal proportion	Range of variation
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
¹³²Eu	63	69	131.95437(43)#	100# ms	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
¹³⁴Eu	63	71	133.94651(21)#	0.5(2) s	β⁺, p (rare)	¹³³Pm
¹³⁵Eu	63	72	134.94182(32)#	1.5(2) s	β⁺	¹³⁵Sm	11/2−#
¹³⁵Eu	63	72	134.94182(32)#	1.5(2) s	β⁺, p	¹³⁴Pm	11/2−#
¹³⁶Eu	63	73	135.93960(21)#	3.3(3) s	β⁺ (99.91%)	¹³⁶Sm	(7+)
¹³⁶Eu	63	73	135.93960(21)#	3.3(3) s	β⁺, p (.09%)	¹³⁵Pm	(7+)
^136mEu	0(500)# keV			3.8(3) s	β⁺ (99.91%)	¹³⁶Sm	(3+)
^136mEu	0(500)# keV			3.8(3) s	β⁺, p (.09%)	¹³⁵Pm	(3+)
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⁺ (95.1(7)%)	¹⁴⁰Sm	1+
¹⁴⁰Eu	63	77	139.92809(6)	1.51(2) s	EC (4.9(7)%)	¹⁴⁰Sm	1+
^140mEu	210(15) keV			125(2) ms	IT (99%)	¹⁴⁰Eu	5−#
^140mEu	210(15) keV			125(2) ms	β⁺(1%)	¹⁴⁰Sm	5−#
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−
^141mEu	96.45(7) keV			2.7(3) s	β⁺ (14%)	¹⁴¹Sm	11/2−
¹⁴²Eu	63	79	141.92343(3)	2.36(10) s	β⁺ (89.9(16)%)	¹⁴²Sm	1+
¹⁴²Eu	63	79	141.92343(3)	2.36(10) s	EC (11.1(16)%)	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+
¹⁴⁷Eu	63	84	146.916746(3)	24.1(6) d	α (.0022%)	¹⁴³Pm	5/2+
¹⁴⁸Eu	63	85	147.918086(11)	54.5(5) d	β⁺ (100%)	¹⁴⁸Sm	5−
¹⁴⁸Eu	63	85	147.918086(11)	54.5(5) d	α (9.39×10⁻⁷%)	¹⁴⁴Pm	5−
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^{[n 10]}	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%)	¹⁵²Sm	3−
					β⁻ (27.9%)	¹⁵²Gd
					β⁺ (0.027%)	¹⁵²Sm
^152m1Eu	45.5998(4) keV			9.3116(13) h	β⁻ (72%)	¹⁵²Gd	0−
^152m1Eu	45.5998(4) keV			9.3116(13) h	β⁺ (28%)	¹⁵²Sm	0−
^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^{[n 11]}	63	90	152.9212303(26)	Observationally Stable^{[n 12]}^[6]			5/2+	0.5219(6)
¹⁵⁴Eu^{[n 11]}	63	91	153.9229792(26)	8.593(4) y	β⁻ (99.98%)	¹⁵⁴Gd	3−
¹⁵⁴Eu^{[n 11]}	63	91	153.9229792(26)	8.593(4) y	EC (.02%)	¹⁵⁴Sm	3−
^154m1Eu	68.1702(4) keV			2.2(1) µs	IT	¹⁵⁴Eu	2+
^154m2Eu	145.3(3) keV			46.3(4) min	IT	¹⁵⁴Eu	(8−)
¹⁵⁵Eu^{[n 11]}	63	92	154.9228933(27)	4.7611(13) y	β⁻	¹⁵⁵Gd	5/2+
¹⁵⁶Eu^{[n 11]}	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)#	7.7(4) s	β⁻	¹⁶³Gd	5/2+#
^163mEu	964.5(10) keV			911(24) ns			(13/2−)
¹⁶⁴Eu	63	101	163.94299(64)#	4.16(19) s	β⁻	¹⁶⁴Gd
¹⁶⁵Eu	63	102	164.94572(75)#	2.163+0.139 −0.120 s^[7]	β⁻	¹⁶⁵Gd	5/2+#
¹⁶⁶Eu	63	103	165.94997(86)#	1.277+0.100 −0.145 s^[7]	β⁻ (99.37%)	¹⁶⁶Gd
¹⁶⁶Eu	63	103	165.94997(86)#	1.277+0.100 −0.145 s^[7]	β⁻, n (0.63%)	¹⁶⁵Gd
¹⁶⁷Eu	63	104	166.95321(86)#	852+76 −54 s^[7]	β⁻ (98.05%)	¹⁶⁷Gd	5/2+#
¹⁶⁷Eu	63	104	166.95321(86)#	852+76 −54 s^[7]	β⁻, n (1.95%)	¹⁶⁶Gd	5/2+#
¹⁶⁸Eu	63	105		440+48 −47 s^[7]	β⁻ (96.05%)	¹⁶⁸Gd
¹⁶⁸Eu	63	105		440+48 −47 s^[7]	β⁻, n (3.95%)	¹⁶⁷Gd
¹⁶⁹Eu	63	106		389+92 −88 s^[7]	β⁻ (85.38%)	¹⁶⁹Gd
¹⁶⁹Eu	63	106		389+92 −88 s^[7]	β⁻, n (14.62%)	¹⁶⁸Gd
¹⁷⁰Eu	63	107		197+74 −71 s^[7]	β⁻	¹⁷⁰Gd
¹⁷⁰Eu	63	107		197+74 −71 s^[7]	β⁻, n	¹⁶⁹Gd
This table header & footer: view

^ ^mEu – Excited nuclear isomer.
^ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
^ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
age of universe
.

^ ^a ^b ^c # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

^ Modes of decay:

EC: Electron capture

IT:
Isomeric transition

p: Proton emission

^ Bold italics symbol as daughter – Daughter product is nearly stable.

^ Bold symbol as daughter – Daughter product is stable.

^ ( ) spin value – Indicates spin with weak assignment arguments.

^ primordial radionuclide

^
Fission product

^ Believed to undergo α decay to ¹⁴⁹Pm with a half-life over 5.5×10¹⁷ years

Europium-155

Medium-lived
fission products ^{[further explanation needed]}

t_½
(year
) Yield
(%)
keV
)
βγ

¹⁵⁵Eu
4.76 0.0803 252 βγ

⁸⁵Kr 10.76 0.2180 687 βγ

^113mCd
14.1 0.0008 316 β

⁹⁰Sr 28.9 4.505 2826 β

¹³⁷Cs 30.23 6.337 1176 βγ

^121mSn
43.9 0.00005 390 βγ

¹⁵¹Sm
88.8 0.5314 77 β

Europium-155 is a
thermal reactor (almost all current nuclear power plants), it has a low fission product yield
, about half of one percent as much as the most abundant fission products.
¹⁵⁵Eu's large
nuclear waste
.
Some ¹⁵⁵Eu is also produced by successive neutron capture on ¹⁵³Eu (nonradioactive, 350 barns thermal, 1500 resonance integral, yield is about 5 times as great as ¹⁵⁵Eu) and ¹⁵⁴Eu (half-life 8.6 years, 1400 barns thermal, 1600 resonance integral, fission yield is extremely small because beta decay stops at ¹⁵⁴Sm). However, the differing cross sections mean that both ¹⁵⁵Eu and ¹⁵⁴Eu are destroyed faster than they are produced.
¹⁵⁴Eu is a prolific emitter of
gamma radiation.^[8]

Isotope Half-life Relative yield
Thermal neutron

Resonance integral

Eu-153 Stable 5 350 1500

Eu-154 8.6 years Nearly 0 1500 1600

Eu-155 4.76 years 1 3900 16000

References

doi:10.1088/1674-1137/abddae
.

^ "Standard Atomic Weights: Europium". CIAAW. 1995.

ISSN 1365-3075
.

doi:10.1016/j.nuclphysa.2007.03.001
.

^ Casali, N.; Nagorny, S. S.; Orio, F.; Pattavina, L.; et al. (2014). "Discovery of the ¹⁵¹Eu α decay". S2CID 116920467
.

S2CID 118657922
.

^
hdl:2117/375253
.

^ "Archived copy" (PDF). Archived from the original (PDF) on 2011-07-06. Retrieved 2011-04-02.{{cite web}}: CS1 maint: archived copy as title (link)

Isotope masses from:
Audi, Georges; Bersillon, Olivier; Blachot, Jean;
doi:10.1016/j.nuclphysa.2003.11.001

Isotopic compositions and standard atomic masses from:
doi:10.1351/pac200375060683
.

Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". doi:10.1351/pac200678112051
.

"News & Notices: Standard Atomic Weights Revised". International Union of Pure and Applied Chemistry. 19 October 2005.

Half-life, spin, and isomer data selected from the following sources.
Audi, Georges; Bersillon, Olivier; Blachot, Jean;
doi:10.1016/j.nuclphysa.2003.11.001

National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory.

Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). ISBN 978-0-8493-0485-9
.

v
t
e
Isotopes of the chemical elements

Group 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Period Hydrogen and
alkali metals Alkaline
earth metals Pnictogens Chalcogens Halogens Noble gases

①
Isotopes § List
H
1
Isotopes § List
He
2

②
Isotopes § List
Li
3
Isotopes § List
Be
4
Isotopes § List
B
5
Isotopes § List
C
6
Isotopes § List
N
7
Isotopes § List
O
8
Isotopes § List
F
9
Isotopes § List
Ne
10

③
Isotopes § List
Na
11
Isotopes § List
Mg
12
Isotopes § List
Al
13
Isotopes § List
Si
14
Isotopes § List
P
15
Isotopes § List
S
16
Isotopes § List
Cl
17
Isotopes § List
Ar
18

④
Isotopes § List
K
19
Isotopes § List
Ca
20
Isotopes § List
Sc
21
Isotopes § List
Ti
22
Isotopes § List
V
23
Isotopes § List
Cr
24
Isotopes § List
Mn
25
Isotopes § List
Fe
26
Isotopes § List
Co
27
Isotopes § List
Ni
28
Isotopes § List
Cu
29
Isotopes § List
Zn
30
Isotopes § List
Ga
31
Isotopes § List
Ge
32
Isotopes § List
As
33
Isotopes § List
Se
34
Isotopes § List
Br
35
Isotopes § List
Kr
36

⑤
Isotopes § List
Rb
37
Isotopes § List
Sr
38
Isotopes § List
Y
39
Isotopes § List
Zr
40
Isotopes § List
Nb
41
Isotopes § List
Mo
42
Isotopes § List
Tc
43
Isotopes § List
Ru
44
Isotopes § List
Rh
45
Isotopes § List
Pd
46
Isotopes § List
Ag
47
Isotopes § List
Cd
48
Isotopes § List
In
49
Isotopes § List
Sn
50
Isotopes § List
Sb
51
Isotopes § List
Te
52
Isotopes § List
I
53
Isotopes § List
Xe
54

⑥
Isotopes § List
Cs
55
Isotopes § List
Ba
56
Isotopes § List
Lu
71
Isotopes § List
Hf
72
Isotopes § List
Ta
73
Isotopes § List
W
74
Isotopes § List
Re
75
Isotopes § List
Os
76
Isotopes § List
Ir
77
Isotopes § List
Pt
78
Isotopes § List
Au
79
Isotopes § List
Hg
80
Isotopes § List
Tl
81
Isotopes § List
Pb
82
Isotopes § List
Bi
83
Isotopes § List
Po
84
Isotopes § List
At
85
Isotopes § List
Rn
86

⑦
Isotopes § List
Fr
87
Isotopes § List
Ra
88
Isotopes § List
Lr
103
Isotopes § List
Rf
104
Isotopes § List
Db
105
Isotopes § List
Sg
106
Isotopes § List
Bh
107
Isotopes § List
Hs
108
Isotopes § List
Mt
109
Isotopes § List
Ds
110
Isotopes § List
Rg
111
Isotopes § List
Cn
112
Isotopes § List
Nh
113
Isotopes § List
Fl
114
Isotopes § List
Mc
115
Isotopes § List
Lv
116
Isotopes § List
Ts
117
Isotopes § List
Og
118

⑧

Isotopes § List
Uue
119
Isotopes § List
Ubn
120

Isotopes § List
La
57
Isotopes § List
Ce
58
Isotopes § List
Pr
59
Isotopes § List
Nd
60
Isotopes § List
Pm
61
Isotopes § List
Sm
62
Isotopes § List
Eu
63
Isotopes § List
Gd
64
Isotopes § List
Tb
65
Isotopes § List
Dy
66
Isotopes § List
Ho
67
Isotopes § List
Er
68
Isotopes § List
Tm
69
Isotopes § List
Yb
70

Isotopes § List
Ac
89
Isotopes § List
Th
90
Isotopes § List
Pa
91
Isotopes § List
U
92
Isotopes § List
Np
93
Isotopes § List
Pu
94
Isotopes § List
Am
95
Isotopes § List
Cm
96
Isotopes § List
Bk
97
Isotopes § List
Cf
98
Isotopes § List
Es
99
Isotopes § List
Fm
100
Isotopes § List
Md
101
Isotopes § List
No
102

Table of nuclides

Categories: Isotopes

Tables of nuclides

Metastable isotopes

Isotopes by element

Retrieved from "https://en.wikipedia.org/w/index.php?title=Isotopes_of_europium&oldid=1218296241"

[6] Eu – Excited nuclear isomer.

[7] ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.

[TMS-8] # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).

[9] universe
.

[TNN-10] # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

[11] Modes of decay:

EC: Electron capture

IT:
Isomeric transition

p: Proton emission

[12] Bold italics symbol as daughter – Daughter product is nearly stable.

[13] Bold symbol as daughter – Daughter product is stable.

[14] ( ) spin value – Indicates spin with weak assignment arguments.

[15] rimordial radionuclide

[FP-16] 
Fission product

[n12-17] Believed to undergo α decay to ¹⁴⁹Pm with a half-life over 5.5×10¹⁷ years

[NUBASE2020-1] :10.1088/1674-1137/abddae
.

[2] "Standard Atomic Weights: Europium". CIAAW. 1995.

[CIAAW2021-3] ISSN 1365-3075
.

[151Eu-Belli-4] :10.1016/j.nuclphysa.2007.03.001
.

[154Eu--5] Casali, N.; Nagorny, S. S.; Orio, F.; Pattavina, L.; et al. (2014). "Discovery of the ¹⁵¹Eu α decay". S2CID 116920467
.

[18] S2CID 118657922
.

[Ln922-19] 
hdl:2117/375253
.

[154Eu-nds.ipen.br2011-20] "Archived copy" (PDF). Archived from the original (PDF) on 2011-07-06. Retrieved 2011-04-02.{{cite web}}: CS1 maint: archived copy as title (link)

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[n 1]

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[n 3]

[n 4]

[n 5]

[n 6]

[n 7]

[n 8]

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[n 12]

[6]

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