Isotopes of gadolinium

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Gadolinium (Gd)
Standard atomic mass: 157.25(3) 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
134Gd	64	70	133.95537(43)#	0.4# s	0+
135Gd	64	71	134.95257(54)#	1.1(2) s	3/2-
136Gd	64	72	135.94734(43)#	1# s [>200 ns]
137Gd	64	73	136.94502(43)#	2.2(2) s	7/2+#
138Gd	64	74	137.94012(21)#	4.7(9) s	0+
138mGd	2232.7(11) keV			6(1) µs	(8-)
139Gd	64	75	138.93824(21)#	5.7(3) s	9/2-#
139mGd	250(150)# keV			4.8(9) s	1/2+#
140Gd	64	76	139.93367(3)	15.8(4) s	0+
141Gd	64	77	140.932126(21)	14(4) s	(1/2+)
141mGd	377.8(2) keV			24.5(5) s	(11/2-)
142Gd	64	78	141.92812(3)	70.2(6) s	0+
143Gd	64	79	142.92675(22)	39(2) s	(1/2)+
143mGd	152.6(5) keV			110.0(14) s	(11/2-)
144Gd	64	80	143.92296(3)	4.47(6) min	0+
145Gd	64	81	144.921709(20)	23.0(4) min	1/2+
145mGd	749.1(2) keV			85(3) s	11/2-
146Gd	64	82	145.918311(5)	48.27(10) d	0+
147Gd	64	83	146.919094(3)	38.06(12) h	7/2-
147mGd	8587.8(4) keV			510(20) ns	(49/2+)
148Gd	64	84	147.918115(3)	74.6(30) a	0+
149Gd	64	85	148.919341(4)	9.28(10) d	7/2-
150Gd	64	86	149.918659(7)	1.79(8)E+6 a	0+
151Gd	64	87	150.920348(4)	124(1) d	7/2-
152Gd	64	88	151.9197910(27)	1.08(8)E+14 a	0+	0.0020(1)
153Gd	64	89	152.9217495(27)	240.4(10) d	3/2-
153m1Gd	95.1737(12) keV			3.5(4) µs	(9/2+)
153m2Gd	171.189(5) keV			76.0(14) µs	(11/2-)
154Gd	64	90	153.9208656(27)	STABLE	0+	0.0218(3)
155Gd	64	91	154.9226220(27)	STABLE	3/2-	0.1480(12)
155mGd	121.05(19) keV			31.97(27) ms	11/2-
156Gd	64	92	155.9221227(27)	STABLE	0+	0.2047(9)
156mGd	2137.60(5) keV			1.3(1) µs	7-
157Gd	64	93	156.9239601(27)	STABLE	3/2-	0.1565(2)
158Gd	64	94	157.9241039(27)	STABLE	0+	0.2484(7)
159Gd	64	95	158.9263887(27)	18.479(4) h	3/2-
160Gd	64	96	159.9270541(27)	STABLE [>31E+18 a]	0+	0.2186(19)
161Gd	64	97	160.9296692(29)	3.646(3) min	5/2-
162Gd	64	98	161.930985(5)	8.4(2) min	0+
163Gd	64	99	162.93399(32)#	68(3) s	7/2+#
164Gd	64	100	163.93586(43)#	45(3) s	0+
165Gd	64	101	164.93938(54)#	10.3(16) s	1/2-#
166Gd	64	102	165.94160(64)#	4.8(10) s	0+
167Gd	64	103	166.94557(64)#	3# s	5/2-#
168Gd	64	104	167.94836(75)#	300# ms	0+
169Gd	64	105	168.95287(86)#	1# s	7/2-#

[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 europium	Isotopes of gadolinium	Isotopes of terbium
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