Isotopes of dysprosium

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Dysprosium (Dy)
Standard atomic mass: 162.500(1) u

[edit] 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)
	excitation energy
138Dy	66	72	137.96249(64)#	200# ms	0+
139Dy	66	73	138.95954(54)#	600(200) ms	7/2+#
140Dy	66	74	139.95401(54)#	700# ms	0+
140mDy	2166.1(5) keV			7.0(5) µs	(8-)
141Dy	66	75	140.95135(32)#	0.9(2) s	(9/2-)
142Dy	66	76	141.94637(39)#	2.3(3) s	0+
143Dy	66	77	142.94383(21)#	5.6(10) s	(1/2+)
143mDy	310.7(6) keV			3.0(3) s	(11/2-)
144Dy	66	78	143.93925(3)	9.1(4) s	0+
145Dy	66	79	144.93743(5)	9.5(10) s	(1/2+)
145mDy	118.2(2) keV			14.1(7) s	(11/2-)
146Dy	66	80	145.932845(29)	33.2(7) s	0+
146mDy	2935.7(6) keV			150(20) ms	(10+)#
147Dy	66	81	146.931092(21)	40(10) s	1/2+
147m1Dy	750.5(4) keV			55(1) s	11/2-
147m2Dy	3407.2(8) keV			0.40(1) µs	(27/2-)
148Dy	66	82	147.927150(11)	3.3(2) min	0+
149Dy	66	83	148.927305(9)	4.20(14) min	7/2(-)
149mDy	2661.1(4) keV			490(15) ms	(27/2-)
150Dy	66	84	149.925585(5)	7.17(5) min	0+
151Dy	66	85	150.926185(4)	17.9(3) min	7/2(-)
152Dy	66	86	151.924718(6)	2.38(2) h	0+
153Dy	66	87	152.925765(5)	6.4(1) h	7/2(-)
154Dy	66	88	153.924424(8)	3.0(15)E+6 a	0+
155Dy	66	89	154.925754(13)	9.9(2) h	3/2-
155mDy	234.33(3) keV			6(1) µs	11/2-
156Dy	66	90	155.924283(7)	STABLE [>1E+18 a]	0+	0.00056(3)
157Dy	66	91	156.925466(7)	8.14(4) h	3/2-
157m1Dy	161.99(3) keV			1.3(2) µs	9/2+
157m2Dy	199.38(7) keV			21.6(16) ms	11/2-
158Dy	66	92	157.924409(4)	STABLE	0+	0.00095(3)
159Dy	66	93	158.9257392(29)	144.4(2) d	3/2-
159mDy	352.77(14) keV			122(3) µs	11/2-
160Dy	66	94	159.9251975(27)	STABLE	0+	0.02329(18)
161Dy	66	95	160.9269334(27)	STABLE	5/2+	0.18889(42)
162Dy	66	96	161.9267984(27)	STABLE	0+	0.25475(36)
163Dy	66	97	162.9287312(27)	STABLE	5/2-	0.24896(42)
164Dy	66	98	163.9291748(27)	STABLE	0+	0.28260(54)
165Dy	66	99	164.9317033(27)	2.334(1) h	7/2+
165mDy	108.160(3) keV			1.257(6) min	1/2-
166Dy	66	100	165.9328067(28)	81.6(1) h	0+
167Dy	66	101	166.93566(6)	6.20(8) min	(1/2-)
168Dy	66	102	167.93713(15)	8.7(3) min	0+
169Dy	66	103	168.94031(32)	39(8) s	(5/2-)
170Dy	66	104	169.94239(21)#	30# s	0+
171Dy	66	105	170.94620(32)#	6# s	7/2-#
172Dy	66	106	171.94876(43)#	3# s	0+
173Dy	66	107	172.95300(54)#	2# s	9/2+#

[edit] 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.

[edit] 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 terbium	Isotopes of dysprosium	Isotopes of holmium
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