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 long-lived 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 (t1/2) of 2.29×1015 years) and 150Nd (double beta decay, t1/2 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 (t1/2 5.5 hours), 135mNd (t1/2 5.5 minutes) and 133m1Nd (t1/2 ~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 decay. The primary decay products before 142Nd are element Pr (praseodymium) isotopes and the primary products after are element Pm (promethium) isotopes.
Relative atomic mass: 144.242(3).
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) | 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 5][n 8] | 60 | 84 | 143.9100873(25) | 2.29(16)×1015 y | 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− | 149Pm | 5/2− | ||
150Nd[n 5][n 8] | 60 | 90 | 149.920891(3) | 6.7(7)×1018 y | 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
- 1 2 3 4 5 6 7 8 Fission product
- ↑ Used in Samarium-neodymium dating
- ↑ Theorized to undergo α decay to 139Ce
- 1 2 Primordial radionuclide
- ↑ Theorized to undergo α decay to 141Ce with a half-life over 6×1016 years
- ↑ 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.
- 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
- ↑ "Universal Nuclide Chart". nucleonica. (registration required (help)).
- Isotope masses from:
- G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001.
- 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; 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.
- 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. 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; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001.
- National Nuclear Data Center. "NuDat 2.1 database". Brookhaven National Laboratory. Retrieved September 2005. Check date values in:
|access-date=
(help) - 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 978-0-8493-0485-9.
Isotopes of praseodymium | Isotopes of neodymium | Isotopes of promethium |
Table of nuclides |
Isotopes of the chemical elements | |||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 H |
2 He | ||||||||||||||||
3 Li |
4 Be |
5 B |
6 C |
7 N |
8 O |
9 F |
10 Ne | ||||||||||
11 Na |
12 Mg |
13 Al |
14 Si |
15 P |
16 S |
17 Cl |
18 Ar | ||||||||||
19 K |
20 Ca |
21 Sc |
22 Ti |
23 V |
24 Cr |
25 Mn |
26 Fe |
27 Co |
28 Ni |
29 Cu |
30 Zn |
31 Ga |
32 Ge |
33 As |
34 Se |
35 Br |
36 Kr |
37 Rb |
38 Sr |
39 Y |
40 Zr |
41 Nb |
42 Mo |
43 Tc |
44 Ru |
45 Rh |
46 Pd |
47 Ag |
48 Cd |
49 In |
50 Sn |
51 Sb |
52 Te |
53 I |
54 Xe |
55 Cs |
56 Ba |
72 Hf |
73 Ta |
74 W |
75 Re |
76 Os |
77 Ir |
78 Pt |
79 Au |
80 Hg |
81 Tl |
82 Pb |
83 Bi |
84 Po |
85 At |
86 Rn | |
87 Fr |
88 Ra |
104 Rf |
105 Db |
106 Sg |
107 Bh |
108 Hs |
109 Mt |
110 Ds |
111 Rg |
112 Cn |
113 Nh |
114 Fl |
115 Mc |
116 Lv |
117 Ts |
118 Og | |
57 La |
58 Ce |
59 Pr |
60 Nd |
61 Pm |
62 Sm |
63 Eu |
64 Gd |
65 Tb |
66 Dy |
67 Ho |
68 Er |
69 Tm |
70 Yb |
71 Lu | |||
89 Ac |
90 Th |
91 Pa |
92 U |
93 Np |
94 Pu |
95 Am |
96 Cm |
97 Bk |
98 Cf |
99 Es |
100 Fm |
101 Md |
102 No |
103 Lr | |||
|