Isotopes of neodymium

Isotopes of neodymium: Naturally occurring neodymium (Nd) is composed of 5 stable isotopes, ¹⁴²Nd, ¹⁴³Nd, ¹⁴⁵Nd, ¹⁴⁶Nd and ¹⁴⁸Nd, with ¹⁴²Nd being the most abundant (27.2% natural abundance), and 2 radioisotopes, ¹⁴⁴Nd and ¹⁵⁰Nd. In all, 33 radioisotopes of Neodymium have been characterized up to now, with the most stable being naturally occurring isotopes ¹⁴⁴Nd (alpha decay, a half-life (T_½) of 2.29×10¹⁵ years) and ¹⁵⁰Nd (double beta decay, T_½ of 7×10¹⁸ years). All of the remaining radioactive isotopes have half-lives that are less than 11 days, and the majority of these have half-lives that are less than 70 seconds. This element also has 13 known meta states with the most stable being ^139mNd (T_½ 5.5 hours), ^135mNd (T_½ 5.5 minutes) and ^133m1Nd (T_½ ~70 seconds).

The primary decay modes before the most abundant stable isotope, ¹⁴²Nd, are electron capture and positron decay, and the primary mode after is beta minus decay. The primary decay products before ¹⁴²Nd are element Pr (praseodymium) isotopes and the primary products after are element Pm (promethium) isotopes.
Standard atomic mass: 144.242(3) u

Table

nuclide
symbol Z(p) N(n)
isotopic mass (u)
half-life^{[n 1]} decay
mode(s)^[1]^{[n 2]} daughter
isotope(s)^{[n 3]} nuclear
spin representative
isotopic
composition
(mole fraction) range of natural
variation
(mole fraction)

excitation energy

¹²⁴Nd 60 64 123.95223(64)# 500# ms 0+

¹²⁵Nd 60 65 124.94888(43)# 600(150) ms 5/2(+#)

¹²⁶Nd 60 66 125.94322(43)# 1# s [>200 ns] β⁺ ¹²⁶Pr 0+

¹²⁷Nd 60 67 126.94050(43)# 1.8(4) s β⁺ ¹²⁷Pr 5/2+#

β⁺, p (rare) ¹²⁶Ce

¹²⁸Nd 60 68 127.93539(21)# 5# s β⁺ ¹²⁸Pr 0+

β⁺, p (rare) ¹²⁷Ce

¹²⁹Nd 60 69 128.93319(22)# 4.9(2) s β⁺ ¹²⁹Pr 5/2+#

β⁺, p (rare) ¹²⁸Ce

¹³⁰Nd 60 70 129.92851(3) 21(3) s β⁺ ¹³⁰Pr 0+

¹³¹Nd 60 71 130.92725(3) 33(3) s β⁺ ¹³¹Pr (5/2)(+#)

β⁺, p (rare) ¹³⁰Ce

¹³²Nd 60 72 131.923321(26) 1.56(10) min β⁺ ¹³²Pr 0+

¹³³Nd 60 73 132.92235(5) 70(10) s β⁺ ¹³³Pr (7/2+)

^133m1Nd 127.97(11) keV ~70 s β⁺ ¹³³Pr (1/2)+

^133m2Nd 176.10(10) keV ~300 ns (9/2-)

¹³⁴Nd 60 74 133.918790(13) 8.5(15) min β⁺ ¹³⁴Pr 0+

^134mNd 2293.1(4) keV 410(30) µs (8)-

¹³⁵Nd 60 75 134.918181(21) 12.4(6) min β⁺ ¹³⁵Pr 9/2(-)

^135mNd 65.0(2) keV 5.5(5) min β⁺ ¹³⁵Pr (1/2+)

¹³⁶Nd 60 76 135.914976(13) 50.65(33) min β⁺ ¹³⁶Pr 0+

¹³⁷Nd 60 77 136.914567(12) 38.5(15) min β⁺ ¹³⁷Pr 1/2+

^137mNd 519.43(17) keV 1.60(15) s IT ¹³⁷Nd (11/2-)

¹³⁸Nd 60 78 137.911950(13) 5.04(9) h β⁺ ¹³⁸Pr 0+

^138mNd 3174.9(4) keV 410(50) ns (10+)

¹³⁹Nd 60 79 138.911978(28) 29.7(5) min β⁺ ¹³⁹Pr 3/2+

^139m1Nd 231.15(5) keV 5.50(20) h β⁺ (88.2%) ¹³⁹Pr 11/2-

IT (11.8%) ¹³⁹Nd

^139m2Nd 2570.9+X keV >=141 ns

¹⁴⁰Nd 60 80 139.90955(3) 3.37(2) d EC ¹⁴⁰Pr 0+

^140mNd 2221.4(1) keV 600(50) µs 7-

¹⁴¹Nd 60 81 140.909610(4) 2.49(3) h β⁺ ¹⁴¹Pr 3/2+

^141mNd 756.51(5) keV 62.0(8) s IT (99.95%) ¹⁴¹Nd 11/2-

β⁺ (.05%) ¹⁴¹Pr

¹⁴²Nd 60 82 141.9077233(25) Observationally Stable^{[n 4]} 0+ 0.272(5) 0.2680-0.2730

¹⁴³Nd^{[n 5]}^{[n 6]} 60 83 142.9098143(25) Observationally Stable^{[n 7]} 7/2- 0.122(2) 0.1212-0.1232

¹⁴⁴Nd^{[n 8]}^{[n 5]} 60 84 143.9100873(25) 2.29(16)×10¹⁵ a α ¹⁴⁰Ce 0+ 0.238(3) 0.2379-0.2397

¹⁴⁵Nd^{[n 5]} 60 85 144.9125736(25) Observationally Stable^{[n 9]} 7/2- 0.083(1) 0.0823-0.0835

¹⁴⁶Nd^{[n 5]} 60 86 145.9131169(25) Observationally Stable^{[n 10]} 0+ 0.172(3) 0.1706-0.1735

¹⁴⁷Nd^{[n 5]} 60 87 146.9161004(25) 10.98(1) d β^- ¹⁴⁷Pm 5/2-

¹⁴⁸Nd^{[n 5]} 60 88 147.916893(3) Observationally Stable^{[n 11]} 0+ 0.057(1) 0.0566-0.0578

¹⁴⁹Nd^{[n 5]} 60 89 148.920149(3) 1.728(1) h β^- ¹⁴⁸Pm 5/2-

¹⁵⁰Nd^{[n 8]}^{[n 5]} 60 90 149.920891(3) 6.7(7)×10¹⁸ a β^-β^- ¹⁵⁰Sm 0+ 0.056(2) 0.0553-0.0569

¹⁵¹Nd 60 91 150.923829(3) 12.44(7) min β^- ¹⁵¹Pm 3/2+

¹⁵²Nd 60 92 151.924682(26) 11.4(2) min β^- ¹⁵²Pm 0+

¹⁵³Nd 60 93 152.927698(29) 31.6(10) s β^- ¹⁵³Pm (3/2)-

¹⁵⁴Nd 60 94 153.92948(12) 25.9(2) s β^- ¹⁵⁴Pm 0+

^154m1Nd 480(150)# keV 1.3(5) µs

^154m2Nd 1349(10) keV >1 µs (5-)

¹⁵⁵Nd 60 95 154.93293(16)# 8.9(2) s β^- ¹⁵⁵Pm 3/2-#

¹⁵⁶Nd 60 96 155.93502(22) 5.49(7) s β^- ¹⁵⁶Pm 0+

^156mNd 1432(5) keV 135 ns 5-

¹⁵⁷Nd 60 97 156.93903(21)# 2# s [>300 ns] β^- ¹⁵⁷Pm 5/2-#

¹⁵⁸Nd 60 98 157.94160(43)# 700# ms [>300 ns] β^- ¹⁵⁸Pm 0+

¹⁵⁹Nd 60 99 158.94609(54)# 500# ms β^- ¹⁵⁹Pm 7/2+#

¹⁶⁰Nd 60 100 159.94909(64)# 300# ms β^- ¹⁶⁰Pm 0+

¹⁶¹Nd 60 101 160.95388(75)# 200# ms β^- ¹⁶¹Pm 1/2-#

^ 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

^ Theoretically capable of Spontaneous fission

^ ^a ^b ^c ^d ^e ^f ^g ^h Fission product

^ Used in Samarium-neodymium dating

^ Theorized to undergo α decay to ¹³⁹Ce

^ ^a ^b Primordial radionuclide

^ Theorized to undergo α decay to ¹⁴¹Ce

^ Theorized to undergo α decay to ¹⁴²Ce

^ Theorized to undergo α decay to ¹⁴⁴Ce with a half-life over 3.0×10¹⁸ years

Notes

Evaluation of isotopic composition is for most but not all commercial samples.

Geologicallyy 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

^ http://www.nucleonica.net/unc.aspx

Isotope masses from:

G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties". Nuclear Physics A 729: 3–128. Bibcode 2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001. http://www.nndc.bnl.gov/amdc/nubase/Nubase2003.pdf.

Isotopic compositions and standard atomic masses from:

J. R. de Laeter, J. K. Böhlke, P. De Bièvre, H. Hidaka, H. S. Peiser, K. J. R. Rosman and P. D. P. Taylor (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry 75 (6): 683–800. doi:10.1351/pac200375060683. http://www.iupac.org/publications/pac/75/6/0683/pdf/.

M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry 78 (11): 2051–2066. doi:10.1351/pac200678112051. http://iupac.org/publications/pac/78/11/2051/pdf/. Lay summary.

Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.

G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties". Nuclear Physics A 729: 3–128. Bibcode 2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001. http://www.nndc.bnl.gov/amdc/nubase/Nubase2003.pdf.

National Nuclear Data Center. "NuDat 2.1 database". Brookhaven National Laboratory. http://www.nndc.bnl.gov/nudat2/. Retrieved September 2005.

N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide. CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. Section 11. ISBN 978-0849304859.

Isotopes of praseodymium Isotopes of neodymium Isotopes of promethium

Index to isotope pages · Table of nuclides

Categories:
Neodymium
Isotopes of neodymium
Lists of isotopes by element

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life^{[n 1]}	decay mode(s)^[1]^{[n 2]}	daughter isotope(s)^{[n 3]}	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
excitation energy
¹²⁴Nd	60	64	123.95223(64)#	500# ms			0+
¹²⁵Nd	60	65	124.94888(43)#	600(150) ms			5/2(+#)
¹²⁶Nd	60	66	125.94322(43)#	1# s [>200 ns]	β⁺	¹²⁶Pr	0+
¹²⁷Nd	60	67	126.94050(43)#	1.8(4) s	β⁺	¹²⁷Pr	5/2+#
β⁺, p (rare)	¹²⁶Ce
¹²⁸Nd	60	68	127.93539(21)#	5# s	β⁺	¹²⁸Pr	0+
β⁺, p (rare)	¹²⁷Ce
¹²⁹Nd	60	69	128.93319(22)#	4.9(2) s	β⁺	¹²⁹Pr	5/2+#
β⁺, p (rare)	¹²⁸Ce
¹³⁰Nd	60	70	129.92851(3)	21(3) s	β⁺	¹³⁰Pr	0+
¹³¹Nd	60	71	130.92725(3)	33(3) s	β⁺	¹³¹Pr	(5/2)(+#)
β⁺, p (rare)	¹³⁰Ce
¹³²Nd	60	72	131.923321(26)	1.56(10) min	β⁺	¹³²Pr	0+
¹³³Nd	60	73	132.92235(5)	70(10) s	β⁺	¹³³Pr	(7/2+)
^133m1Nd	127.97(11) keV	~70 s	β⁺	¹³³Pr	(1/2)+
^133m2Nd	176.10(10) keV	~300 ns			(9/2-)
¹³⁴Nd	60	74	133.918790(13)	8.5(15) min	β⁺	¹³⁴Pr	0+
^134mNd	2293.1(4) keV	410(30) µs			(8)-
¹³⁵Nd	60	75	134.918181(21)	12.4(6) min	β⁺	¹³⁵Pr	9/2(-)
^135mNd	65.0(2) keV	5.5(5) min	β⁺	¹³⁵Pr	(1/2+)
¹³⁶Nd	60	76	135.914976(13)	50.65(33) min	β⁺	¹³⁶Pr	0+
¹³⁷Nd	60	77	136.914567(12)	38.5(15) min	β⁺	¹³⁷Pr	1/2+
^137mNd	519.43(17) keV	1.60(15) s	IT	¹³⁷Nd	(11/2-)
¹³⁸Nd	60	78	137.911950(13)	5.04(9) h	β⁺	¹³⁸Pr	0+
^138mNd	3174.9(4) keV	410(50) ns			(10+)
¹³⁹Nd	60	79	138.911978(28)	29.7(5) min	β⁺	¹³⁹Pr	3/2+
^139m1Nd	231.15(5) keV	5.50(20) h	β⁺ (88.2%)	¹³⁹Pr	11/2-
IT (11.8%)	¹³⁹Nd
^139m2Nd	2570.9+X keV	>=141 ns
¹⁴⁰Nd	60	80	139.90955(3)	3.37(2) d	EC	¹⁴⁰Pr	0+
^140mNd	2221.4(1) keV	600(50) µs			7-
¹⁴¹Nd	60	81	140.909610(4)	2.49(3) h	β⁺	¹⁴¹Pr	3/2+
^141mNd	756.51(5) keV	62.0(8) s	IT (99.95%)	¹⁴¹Nd	11/2-
β⁺ (.05%)	¹⁴¹Pr
¹⁴²Nd	60	82	141.9077233(25)	Observationally Stable^{[n 4]}	0+	0.272(5)	0.2680-0.2730
¹⁴³Nd^{[n 5]}^{[n 6]}	60	83	142.9098143(25)	Observationally Stable^{[n 7]}	7/2-	0.122(2)	0.1212-0.1232
¹⁴⁴Nd^{[n 8]}^{[n 5]}	60	84	143.9100873(25)	2.29(16)×10¹⁵ a	α	¹⁴⁰Ce	0+	0.238(3)	0.2379-0.2397
¹⁴⁵Nd^{[n 5]}	60	85	144.9125736(25)	Observationally Stable^{[n 9]}	7/2-	0.083(1)	0.0823-0.0835
¹⁴⁶Nd^{[n 5]}	60	86	145.9131169(25)	Observationally Stable^{[n 10]}	0+	0.172(3)	0.1706-0.1735
¹⁴⁷Nd^{[n 5]}	60	87	146.9161004(25)	10.98(1) d	β^-	¹⁴⁷Pm	5/2-
¹⁴⁸Nd^{[n 5]}	60	88	147.916893(3)	Observationally Stable^{[n 11]}	0+	0.057(1)	0.0566-0.0578
¹⁴⁹Nd^{[n 5]}	60	89	148.920149(3)	1.728(1) h	β^-	¹⁴⁸Pm	5/2-
¹⁵⁰Nd^{[n 8]}^{[n 5]}	60	90	149.920891(3)	6.7(7)×10¹⁸ a	β^-β^-	¹⁵⁰Sm	0+	0.056(2)	0.0553-0.0569
¹⁵¹Nd	60	91	150.923829(3)	12.44(7) min	β^-	¹⁵¹Pm	3/2+
¹⁵²Nd	60	92	151.924682(26)	11.4(2) min	β^-	¹⁵²Pm	0+
¹⁵³Nd	60	93	152.927698(29)	31.6(10) s	β^-	¹⁵³Pm	(3/2)-
¹⁵⁴Nd	60	94	153.92948(12)	25.9(2) s	β^-	¹⁵⁴Pm	0+
^154m1Nd	480(150)# keV	1.3(5) µs
^154m2Nd	1349(10) keV	>1 µs			(5-)
¹⁵⁵Nd	60	95	154.93293(16)#	8.9(2) s	β^-	¹⁵⁵Pm	3/2-#
¹⁵⁶Nd	60	96	155.93502(22)	5.49(7) s	β^-	¹⁵⁶Pm	0+
^156mNd	1432(5) keV	135 ns			5-
¹⁵⁷Nd	60	97	156.93903(21)#	2# s [>300 ns]	β^-	¹⁵⁷Pm	5/2-#
¹⁵⁸Nd	60	98	157.94160(43)#	700# ms [>300 ns]	β^-	¹⁵⁸Pm	0+
¹⁵⁹Nd	60	99	158.94609(54)#	500# ms	β^-	¹⁵⁹Pm	7/2+#
¹⁶⁰Nd	60	100	159.94909(64)#	300# ms	β^-	¹⁶⁰Pm	0+
¹⁶¹Nd	60	101	160.95388(75)#	200# ms	β^-	¹⁶¹Pm	1/2-#

Isotopes of praseodymium	Isotopes of neodymium	Isotopes of promethium
Index to isotope pages · Table of nuclides

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