Isotopes of neodymium

Isotopes of neodymium (60Nd) | Main isotopes[1] | Decay

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| abun­dance | half-life (t1/2) | mode | pro­duct
142Nd  | 27.2%  | stable
143Nd  | 12.2%  | stable
144Nd  | 23.8%  | 2.29×1015 y | α | 140Ce
145Nd  | 8.3%  | stable
146Nd  | 17.2%  | stable
148Nd  | 5.80%  | stable
150Nd  | 5.60%  | 9.3×1018 y[1] | β−β− | 150Sm
Standard atomic weight Ar°(Nd)

* 144.242±0.003[2]
* 144.24±0.01 (abridged)[3]

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Naturally occurring neodymium (60Nd) is composed of five stable isotopes, 142Nd, 143Nd, 145Nd, 146Nd and 148Nd, with 142Nd being the most abundant (27.2% natural abundance), and two long-lived radioisotopes, 144Nd and 150Nd. In all, 35 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 9.3×1018 years), and for practical purposes they can be considered to be stable as well. 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; the most stable artificial isotope is 147Nd with a half-life of 10.98 days. This element also has 15 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 for isotopes lighter than the most abundant stable isotope (also the only theoretically stable isotope), 142Nd, are electron capture and positron decay, and the primary mode for heavier radioisotopes is beta decay. The primary decay products for lighter radioisotopes are praseodymium isotopes and the primary products for heavier ones are promethium isotopes.

## Neodymium isotopes as fission products

[edit]

Neodymium is one of the more common fission products that results from the splitting of uranium-233, uranium-235, plutonium-239 and plutonium-241. The distribution of resulting neodymium isotopes is distinctly different than those found in crustal rock formation on Earth. One of the methods used to verify that the Oklo Fossil Reactors in Gabon had produced a natural nuclear fission reactor some two billion years before present was to compare the relative abundances of neodymium isotopes found at the reactor site with those found elsewhere on Earth.[4][5][6]

## List of isotopes

[edit]

Nuclide
[n 1] | Z | N | Isotopic mass (Da)[7]
[n 2][n 3] | Half-life[1]
[n 4][n 5] | Decay
mode[1]
[n 6] | Daughter
isotope
[n 7] | Spin and
parity[1]
[n 8][n 5] | Natural abundance (mole fraction)

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Excitation energy[n 5] | Normal proportion[1] | Range of variation
125Nd  | 60  | 65  | 124.94840(43)#  | 0.65(15) s  | β+ | 125Pr  | (5/2)(+#)  |  |
β+, p (?%)  | 124Ce
126Nd  | 60  | 66  | 125.94269(32)#  | 1# s
[>200 ns]  |  |  | 0+  |  |
127Nd  | 60  | 67  | 126.93998(32)#  | 1.8(4) s  | β+ | 127Pr  | 5/2+#  |  |
β+, p (?%)  | 126Ce
128Nd  | 60  | 68  | 127.93502(22)#  | 5# s  |  |  | 0+  |  |
129Nd  | 60  | 69  | 128.93304(22)#  | 6.8(6) s  | β+ | 129Pr  | 7/2−[8] |  |
β+, p (?%)  | 128Ce
129m1Nd  | 17 keV[8] | 2.6(4) s  | β+ | 129Pr  | 1/2+[8] |  |
β+, p (?%)  | 128Ce
129m2Nd[8] | 39 keV  | 2.6(4) s  | β+ | 129Pr  | 3/2+  |  |
β+, p (?%)  | 128Ce
129m3Nd[8] | 108 keV  |  | IT (?%)  | 129m2Nd  | 5/2+  |  |
IT (?%)  | 129Nd
129m4Nd[8] | 1893 keV  |  | IT  | 129Nd  | (17/2+)  |  |
129m5Nd[8] | 2109 keV  |  | IT  | 129Nd  | (19/2+)  |  |
129m6Nd[8] | 2284 keV  | 0.48(4) μs  | IT  | 129Nd  | (21/2+)  |  |
130Nd  | 60  | 70  | 129.928506(30)  | 21(3) s  | β+ | 130Pr  | 0+  |  |
131Nd  | 60  | 71  | 130.927248(30)  | 25.4(9) s  | β+ | 131Pr  | (5/2+)  |  |
β+, p (?%)  | 130Ce
132Nd  | 60  | 72  | 131.923321(26)  | 1.56(10) min  | β+ | 132Pr  | 0+  |  |
133Nd  | 60  | 73  | 132.922348(50)  | 70(10) s  | β+ | 133Pr  | (7/2+)  |  |
133m1Nd  | 127.97(12) keV  | ~70 s  | β+ (?%)  | 133Pr  | (1/2)+  |  |
IT (?%)  | 133Nd
133m2Nd  | 176.10(10) keV  | 301(18) ns  | IT  | 133Nd  | (9/2–)  |  |
134Nd  | 60  | 74  | 133.918790(13)  | 8.5(15) min  | β+ | 134Pr  | 0+  |  |
134mNd  | 2293.0(4) keV  | 389(17) μs  | IT  | 134Nd  | 8–  |  |
135Nd  | 60  | 75  | 134.918181(21)  | 12.4(6) min  | β+ | 135Pr  | 9/2–  |  |
135mNd  | 64.95(24) 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  | 136.914563(13)  | 38.5(15) min  | β+ | 137Pr  | 1/2+  |  |
137mNd  | 519.43(20) keV  | 1.60(15) s  | IT  | 137Nd  | 11/2–  |  |
138Nd  | 60  | 78  | 137.911951(12)  | 5.04(9) h  | β+ | 138Pr  | 0+  |  |
138mNd  | 3174.5(4) keV  | 370(5) ns  | IT  | 138Nd  | 10+  |  |
139Nd  | 60  | 79  | 138.911951(30)  | 29.7(5) min  | β+ | 139Pr  | 3/2+  |  |
139m1Nd  | 231.16(5) keV  | 5.50(20) h  | β+ (87.0%)  | 139Pr  | 11/2–  |  |
IT (13.0%)  | 139Nd
139m2Nd  | 2616.9(6) keV  | 276.8(18) ns  | IT  | 139Nd  | 23/2  |  |
140Nd  | 60  | 80  | 139.9095461(35)  | 3.37(2) d  | EC | 140Pr  | 0+  |  |
140m1Nd  | 2221.65(9) keV  | 600(50) μs  | IT  | 140Nd  | 7–  |  |
140m2Nd  | 7435.1(4) keV  | 1.22(6) μs  | IT  | 140Nd  | 20+  |  |
141Nd  | 60  | 81  | 140.9096167(34)  | 2.49(3) h  | EC (97.28%)  | 141Pr | 3/2+  |  |
β+ (2.72%)  | 141Pr
141mNd  | 756.51(5) keV  | 62.0(8) s  | IT (99.97%)  | 141Nd  | 11/2–  |  |
β+ (0.032%)  | 141Pr
142Nd  | 60  | 82  | 141.9077288(13)  | Stable | 0+  | 0.27153(40)  |
143Nd[n 9] | 60  | 83  | 142.9098198(13)  | Observationally Stable[n 10] | 7/2−  | 0.12173(26)  |
144Nd[n 9][n 11] | 60  | 84  | 143.9100928(13)  | 2.29(16)×1015 y | α | 140Ce | 0+  | 0.23798(19)  |
145Nd[n 9] | 60  | 85  | 144.9125792(14)  | Observationally Stable[n 12] | 7/2−  | 0.08293(12)  |
146Nd[n 9] | 60  | 86  | 145.9131225(14)  | Observationally Stable[n 13] | 0+  | 0.17189(32)  |
147Nd[n 9] | 60  | 87  | 146.9161060(14)  | 10.98(1) d  | β− | 147Pm  | 5/2−  |  |
148Nd[n 9] | 60  | 88  | 147.9168990(22)  | Observationally Stable[n 14] | 0+  | 0.05756(21)  |
149Nd[n 9] | 60  | 89  | 148.9201546(22)  | 1.728(1) h  | β− | 149Pm  | 5/2−  |  |
150Nd[n 9][n 11] | 60  | 90  | 149.9209013(12)  | 9.3(7)×1018 y | β−β− | 150Sm | 0+  | 0.05638(28)  |
151Nd  | 60  | 91  | 150.9238394(12)  | 12.44(7) min  | β− | 151Pm  | 3/2+  |  |
152Nd  | 60  | 92  | 151.924691(26)  | 11.4(2) min  | β− | 152Pm  | 0+  |  |
153Nd  | 60  | 93  | 152.9277179(29)  | 31.6(10) s  | β− | 153Pm  | (3/2)−  |  |
153mNd  | 191.71(16) keV  | 1.10(4) μs  | IT  | 153Nd  | (5/2)+  |  |
154Nd  | 60  | 94  | 153.9295974(11)  | 25.9(2) s  | β− | 154Pm  | 0+  |  |
154mNd  | 1297.9(4) keV  | 3.2(3) μs  | IT  | 154Nd  | (4−)  |  |
155Nd  | 60  | 95  | 154.9331356(98)  | 8.9(2) s  | β− | 155Pm  | (3/2−)  |  |
156Nd  | 60  | 96  | 155.9353704(14)  | 5.06(13) s  | β− | 156Pm  | 0+  |  |
156mNd  | 1431.3(4) keV  | 365(145) ns  | IT  | 156Nd  | 5−  |  |
157Nd  | 60  | 97  | 156.9393511(23)  | 1.17(4) s[12] | β− | 157Pm  | 5/2−#  |  |
158Nd  | 60  | 98  | 157.9422056(14)  | 810(30) ms  | β− | 158Pm  | 0+  |  |
158mNd  | 1648.1(14) keV  | 339(20) ns  | IT  | 158Nd  | (6−)  |  |
159Nd  | 60  | 99  | 158.946619(32)  | 500(30) ms  | β− | 159Pm  | 7/2+#  |  |
160Nd  | 60  | 100  | 159.949839(50)  | 439(37) ms  | β− | 160Pm  | 0+  |  |
160mNd  | 1107.9(9) keV  | 1.63(21) μs  | IT  | 160Nd  | (4−)  |  |
161Nd  | 60  | 101  | 160.95466(43)#  | 215(76) ms  | β− | 161Pm  | 1/2−#  |  |
162Nd  | 60  | 102  | 161.95812(43)#  | 310(200) ms  | β− | 162Pm  | 0+  |  |
163Nd  | 60  | 103  | 162.96341(54)#  | 80# ms
[>550 ns]  |  |  | 5/2−#  |  |
This table header & footer:

* view

1. ^ mNd - Excited nuclear isomer.
2. ^ ( ) - Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
3. ^ # - Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
4. ^ Bold half-life - nearly stable, half-life longer than age of universe.
5. ^ a b c # - Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
6. ^ Modes of decay:  EC: | Electron capture

|

IT: | Isomeric transition

p: | Proton emission
7. ^ Bold symbol as daughter - Daughter product is stable.
8. ^ ( ) spin value - Indicates spin with weak assignment arguments.
9. ^ a b c d e f g h Fission product
10. ^ Believed to undergo α decay to 139Ce with a half-life over 1.1×1020 years[9][10]
11. ^ a b Primordial radionuclide
12. ^ Believed to undergo α decay to 141Ce with a half-life of over 6.1×1019 years[11][10]
13. ^ Believed to undergo β−β− decay to 146Sm, or α decay to 142Ce with a half-life of over 3.3×1021 years[11][10]
14. ^ Believed to undergo β−β− decay to 148Sm with a half-life over 3×1018 years, or α decay to 144Ce with a half-life of over 1.2×1019 years[11][10]

## References

[edit]

1. ^ a b c d e f Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
2. ^ "Standard Atomic Weights: Neodymium". CIAAW. 2005.
3. ^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
4. ^ Hemond, C.; Menet, C.; Menager, M.T. (1991). "U and Nd Isotopes from the New Oklo Reactor 10 (GABON): Evidence for Radioelements Migration". MRS Proceedings. 257. doi:10.1557/PROC-257-489.
5. ^ "Oklo's Natural Nuclear Reactors". 24 October 2020.
6. ^ "The Implications of the Oklo Phenomenon on the Constancy of Radiometric Decay Rates".
7. ^ Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf.
8. ^ a b c d e f g h Petrache, C. M.; Uusitalo, J.; Briscoe, A. D.; Sullivan, C. M.; Joss, D. T.; Tann, H.; Aktas, ö.; Alayed, B.; Al-Aqeel, M. A. M.; Astier, A.; Badran, H.; Cederwall, B.; Delafosse, C.; Ertoprak, A.; Favier, Z.; Forsberg, U.; Gins, W.; Grahn, T.; Greenlees, P. T.; He, X. T.; Heery, J.; Hilton, J.; Kalantan, S.; Li, R.; Jodidar, P. M.; Julin, R.; Juutinen, S.; Leino, M.; Lewis, M. C.; Li, J. G.; Li, Z. P.; Luoma, M.; Lv, B. F.; McCarter, A.; Nathaniel, S.; Ojala, J.; Page, R. D.; Pakarinen, J.; Papadakis, P.; Parr, E.; Partanen, J.; Paul, E. S.; Rahkila, P.; Ruotsalainen, P.; Sandzelius, M.; Sarén, J.; Smallcombe, J.; Sorri, J.; Szwec, S.; Wang, L. J.; Wang, Y.; Waring, L.; Xu, F. R.; Zhang, J.; Zhang, Z. H.; Zheng, K. K.; Zimba, G. (19 July 2023). "High- K three-quasiparticle isomers in the proton-rich nucleus Nd 129" (PDF). Physical Review C. 108 (1). doi:10.1103/PhysRevC.108.014317.
9. ^ Belli, P.; Bernabei, R.; Boiko, R. S.; Cappella, F.; Caracciolo, V.; Cerulli, R.; Danevich, F. A.; Incicchitti, A.; Kasperovych, D. V.; Kobychev, V. V.; Laubenstein, M.; Leoncini, A.; Merlo, V.; Poda, D. V.; Polischuk, O. G.; Sokur, N. V.; Tretyak, V. I. (1 March 2024). "Search for alpha and double alpha decays of natural Nd isotopes accompanied by gamma quanta". European Physical Journal A. 60 (46). doi:10.1140/epja/s10050-024-01260-3.
10. ^ a b c d Belli, P.; Bernabei, R.; Danevich, F. A.; Incicchitti, A.; Tretyak, V. I. (2019). "Experimental searches for rare alpha and beta decays". European Physical Journal A. 55 (140): 4–6\. arXiv:1908.11458. Bibcode:2019EPJA...55..140B. doi:10.1140/epja/i2019-12823-2. S2CID 201664098.4-6&rft.date=2019&rft_id=info:arxiv/1908.11458&rft_id=https://api.semanticscholar.org/CorpusID:201664098#id-name=S2CID&rft_id=info:doi/10.1140/epja/i2019-12823-2&rft_id=info:bibcode/2019EPJA...55..140B&rft.aulast=Belli&rft.aufirst=P.&rft.au=Bernabei,+R.&rft.au=Danevich,+F.+A.&rft.au=Incicchitti,+A.&rft.au=Tretyak,+V.+I.&rfr_id=info:sid/en.wikipedia.org:Isotopes+of+neodymium" class="Z3988">
11. ^ a b c Sokur, N.V.; Belli, P.; Bernabei, R.; Boiko, R.S.; Cappella, F.; Caracciolo, V.; Cerulli, R.; Danevich, F.A.; Incicchitti, A.; Kasperovych, D.V.; Kobychev, V.V.; Laubenstein, M.; Leoncini, A.; Merlo, V.; Polischuk, O.G.; Tretyak, V.I. (11 July 2023). Alpha decay of naturally occurring neodymium isotopes. XII International Conference on New Frontiers in Physics.
12. ^ Hartley, D. J.; Kondev, F. G.; Carpenter, M. P.; Clark, J. A.; Copp, P.; Kay, B.; Lauritsen, T.; Savard, G.; Seweryniak, D.; Wilson, G. L.; Wu, J. (2023-08-14). "First β−-decay spectroscopy study of 157Nd". Physical Review C. 108 (2). American Physical Society (APS): 024307. Bibcode:2023PhRvC.108b4307H. doi:10.1103/physrevc.108.024307. ISSN 2469-9985. S2CID 260913513.

* Isotope masses from:
* Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.0013-128&rft.date=2003&rft_id=info:doi/10.1016/j.nuclphysa.2003.11.001&rft_id=info:bibcode/2003NuPhA.729....3A&rft.aulast=Audi&rft.aufirst=Georges&rft.au=Bersillon,+Olivier&rft.au=Blachot,+Jean&rft.au=Wapstra,+Aaldert+Hendrik&rft_id=https://hal.archives-ouvertes.fr/in2p3-00020241/document&rfr_id=info:sid/en.wikipedia.org:Isotopes+of+neodymium" class="Z3988">
* Isotopic compositions and standard atomic masses from:
* de Laeter, John Robert; Böhlke, John Karl; De Bièvre, Paul; Hidaka, Hiroshi; Peiser, H. Steffen; Rosman, Kevin J. R.; Taylor, Philip D. P. (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800\. doi:10.1351/pac200375060683.683-800&rft.date=2003&rft_id=info:doi/10.1351/pac200375060683&rft.aulast=de+Laeter&rft.aufirst=John+Robert&rft.au=Böhlke,+John+Karl&rft.au=De+Bièvre,+Paul&rft.au=Hidaka,+Hiroshi&rft.au=Peiser,+H.+Steffen&rft.au=Rosman,+Kevin+J.+R.&rft.au=Taylor,+Philip+D.+P.&rft_id=https://doi.org/10.1351%2Fpac200375060683&rfr_id=info:sid/en.wikipedia.org:Isotopes+of+neodymium" class="Z3988">
* Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066\. doi:10.1351/pac200678112051.2051-2066&rft.date=2006&rft_id=info:doi/10.1351/pac200678112051&rft.aulast=Wieser&rft.aufirst=Michael+E.&rft_id=https://doi.org/10.1351%2Fpac200678112051&rfr_id=info:sid/en.wikipedia.org:Isotopes+of+neodymium" class="Z3988">
* "News & Notices: Standard Atomic Weights Revised". International Union of Pure and Applied Chemistry. 19 October 2005.
* Half-life, spin, and isomer data selected from the following sources.
* Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.0013-128&rft.date=2003&rft_id=info:doi/10.1016/j.nuclphysa.2003.11.001&rft_id=info:bibcode/2003NuPhA.729....3A&rft.aulast=Audi&rft.aufirst=Georges&rft.au=Bersillon,+Olivier&rft.au=Blachot,+Jean&rft.au=Wapstra,+Aaldert+Hendrik&rft_id=https://hal.archives-ouvertes.fr/in2p3-00020241/document&rfr_id=info:sid/en.wikipedia.org:Isotopes+of+neodymium" class="Z3988">
* National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory.
* Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.

* v
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Isotopes of the chemical elements

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117  |

Isotopes § List

118
⑧ |

Isotopes § List

Uue

119  |

Isotopes § List

Ubn

120
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Isotopes § List

57  |

Isotopes § List

58  |

Isotopes § List

59  |

Isotopes § List

60  |

Isotopes § List

61  |

Isotopes § List

62  |

Isotopes § List

63  |

Isotopes § List

64  |

Isotopes § List

65  |

Isotopes § List

66  |

Isotopes § List

67  |

Isotopes § List

68  |

Isotopes § List

69  |

Isotopes § List

70  |
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Isotopes § List

89  |

Isotopes § List

90  |

Isotopes § List

91  |

Isotopes § List

92  |

Isotopes § List

93  |

Isotopes § List

94  |

Isotopes § List

95  |

Isotopes § List

96  |

Isotopes § List

97  |

Isotopes § List

98  |

Isotopes § List

99  |

Isotopes § List

100  |

Isotopes § List

101  |

Isotopes § List

102

* Table of nuclides
* Categories: Isotopes
* Tables of nuclides
* Metastable isotopes
* Isotopes by element

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