Isotopes of europium

Naturally occurring europium is composed of 2 isotopes, ¹⁵¹Eu and ¹⁵³Eu, with ¹⁵³Eu being the most abundant (52. Europium (jʊˈroʊpiəm is a Chemical element with the symbol Eu and Atomic number 63 Isotopes (Greek isos = "equal" tópos = "site place" are any of the different types of atoms ( Nuclides 2% natural abundance). In Chemistry, natural abundance (NA refers to the abundance Isotopes of a Chemical element as naturally found on a planet While ¹⁵³Eu is stable, ¹⁵¹Eu was recently found to be unstable to alpha decay with half-life of $5_{-3}^{+11}\times 10^{18}$ yr^[1]. Alpha decay is a type of radioactive decay in which an Atomic nucleus emits an Alpha particle (two protons and two neutrons bound together into a particle Half-Life (computer-game page here It's already listed in the disambiguation page Besides natural radioisotope ¹⁵¹Eu, 35 artificial radioisotopes have been characterized, with the most stable being ¹⁵⁰Eu with a half-life of 36. Half-Life (computer-game page here It's already listed in the disambiguation page 9 years, ¹⁵²Eu with a half-life of 13. 516 years, and ¹⁵⁴Eu with a half-life of 8. 593 years. All of the remaining radioactive isotopes have half-lives that are less than 4. Radioactive decay is the process in which an unstable Atomic nucleus loses energy by emitting ionizing particles and Radiation. 7612 years, and the majority of these have half-lives that are less than 12. 2 seconds. This element also has 8 meta states, with the most stable being ^150mEu (t_½ 12. A nuclear isomer is a Metastable state of an Atomic nucleus caused by the excitation of one or more of its Nucleons A nuclear isomer occupies 8 hours), ^152m1Eu (t_½ 9. 3116 hours) and ^152m2Eu (t_½ 96 minutes).

The primary decay mode before the most abundant stable isotope, ¹⁵³Eu, is electron capture, and the primary mode after is beta minus decay. Radioactive decay is the process in which an unstable Atomic nucleus loses energy by emitting ionizing particles and Radiation. Electron capture (sometimes called inverse beta decay) is a Decay mode for Isotopes that will occur when there are too many Protons in the In Nuclear physics, beta decay is a type of Radioactive decay in which a Beta particle (an Electron or a Positron) is emitted The primary decay products before ¹⁵³Eu are isotopes of samarium (Sm) and the primary products after are isotopes of gadolinium (Gd). In Nuclear physics, a decay product, also known as a daughter product, daughter isotope or daughter nuclide, is a Nuclide Samarium (səˈmɛəriəm is a Chemical element with the symbol Sm and Atomic number 62 Gadolinium (ˌgædəˈlɪniəm is a Chemical element that has the symbol Gd and Atomic number 64
Standard atomic mass: 151. 964(1) u

1 Table
- 1.1 Notes
2 References
3 See also

Table

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
nuclide symbol	excitation energy			half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
¹³⁰Eu	63	67	129. The unified atomic mass unit ( u) or Dalton ( Da) or sometimes universal mass unit, is an unit of Mass used to express The proton ( Greek πρῶτον / proton "first" is a Subatomic particle with an Electric charge of one positive This article is a discussion of neutrons in general For the specific case of a neutron found outside the nucleus see Free neutron. 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
¹³³Eu	63	70	132. 94924(32)#	200# ms	11/2-#
¹³⁴Eu	63	71	133. 94651(21)#	0. 5(2) s
¹³⁵Eu	63	72	134. 94182(32)#	1. 5(2) s	11/2-#
¹³⁶Eu	63	73	135. 93960(21)#	3. 3(3) s	(7+)
^136mEu	0(500)# keV			3. 8(3) s	(3+)
¹³⁷Eu	63	74	136. 93557(21)#	8. 4(5) s	11/2-#
¹³⁸Eu	63	75	137. 93371(3)	12. 1(6) s	(6-)
¹³⁹Eu	63	76	138. 929792(14)	17. 9(6) s	(11/2)-
¹⁴⁰Eu	63	77	139. 92809(6)	1. 51(2) s	1+
^140mEu	210(15) keV			125(2) ms	5-#
¹⁴¹Eu	63	78	140. 924931(14)	40. 7(7) s	5/2+
^141mEu	96. 45(7) keV			2. 7(3) s	11/2-
¹⁴²Eu	63	79	141. 92343(3)	2. 36(10) s	1+
^142mEu	460(30) keV			1. 223(8) min	8-
¹⁴³Eu	63	80	142. 920298(12)	2. 59(2) min	5/2+
^143mEu	389. 51(4) keV			50. 0(5) µs	11/2-
¹⁴⁴Eu	63	81	143. 918817(12)	10. 2(1) s	1+
^144mEu	1127. 6(6) keV			1. 0(1) µs	(8-)
¹⁴⁵Eu	63	82	144. 916265(4)	5. 93(4) d	5/2+
^145mEu	716. 0(3) keV			490 ns	11/2-
¹⁴⁶Eu	63	83	145. 917206(7)	4. 61(3) d	4-
^146mEu	666. 37(16) keV			235(3) µs	9+
¹⁴⁷Eu	63	84	146. 916746(3)	24. 1(6) d	5/2+
¹⁴⁸Eu	63	85	147. 918086(11)	54. 5(5) d	5-
¹⁴⁹Eu	63	86	148. 917931(5)	93. 1(4) d	5/2+
¹⁵⁰Eu	63	87	149. 919702(7)	36. 9(9) a	5(-)
^150mEu	42. 1(5) keV			12. 8(1) h	0-
¹⁵¹Eu	63	88	150. 9198502(26)	5×10¹⁸ a	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) a	3-
^152m1Eu	45. 5998(4) keV			9. 3116(13) h	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	63	90	152. 9212303(26)	STABLE	5/2+	0. 5219(6)
¹⁵⁴Eu	63	91	153. 9229792(26)	8. 593(4) a	3-
^154m1Eu	145. 3(3) keV			46. 3(4) min	(8-)
^154m2Eu	68. 1702(4) keV			2. 2(1) µs	2+
¹⁵⁵Eu	63	92	154. 9228933(27)	4. 7611(13) a	5/2+
¹⁵⁶Eu	63	93	155. 924752(6)	15. 19(8) d	0+
¹⁵⁷Eu	63	94	156. 925424(6)	15. 18(3) h	5/2+
¹⁵⁸Eu	63	95	157. 92785(8)	45. 9(2) min	(1-)
¹⁵⁹Eu	63	96	158. 929089(8)	18. 1(1) min	5/2+
¹⁶⁰Eu	63	97	159. 93197(22)#	38(4) s	1(-)
¹⁶¹Eu	63	98	160. 93368(32)#	26(3) s	5/2+#
¹⁶²Eu	63	99	161. 93704(32)#	10. 6(10) s
¹⁶³Eu	63	100	162. 93921(54)#	6# s	5/2+#
¹⁶⁴Eu	63	101	163. 94299(64)#	2# s
¹⁶⁵Eu	63	102	164. 94572(75)#	1# s	5/2+#
¹⁶⁶Eu	63	103	165. 94997(86)#	400# ms
¹⁶⁷Eu	63	104	166. 95321(86)#	200# ms	5/2+#

Notes

Geologically exceptional samples are known in which the isotopic composition lies outside the reported range. The uncertainty in the atomic mass may exceed the stated value for such specimens.
Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
- Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
- David R. Lide (ed. ), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.

Isotopes of samarium	Isotopes of europium	Isotopes of gadolinium
Index to isotope pages · Table of nuclides

Contents

Table

Notes

References

See also