Isotopes of neodymium

Short description: Nuclides with atomic number of 60 but with different mass numbers

Main isotopes of Chemistry:neodymium (60Nd) | Iso­tope | 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  | 5.8%  | stable
150Nd  | 5.6%  | 6.7×1018 y  | β−β− | 150Sm
Standard atomic weight Ar, standard(Nd)|

* 144.242(3)[1]

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Naturally occurring neodymium (60Nd) 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 12 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 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 (also the only theoretically stable isotope), 142Nd, are electron capture and positron decay, and the primary mode after is beta decay. The primary decay products before 142Nd are praseodymium isotopes and the primary products after are promethium isotopes.

## Neodymium isotopes as fission products

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.[2][3][4]

## List of isotopes

Template:Anchor (or Anchors): too many anchors, maximum is ten

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

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Excitation energy[n 5] | Normal proportion  | Range of variation
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 | 0+  | 0.272(5)  | 0.2680–0.2730
143Nd[n 9] | 60  | 83  | 142.9098143(25)  | Observationally Stable[n 10] | 7/2−  | 0.122(2)  | 0.1212–0.1232
144Nd[n 9][n 11] | 60  | 84  | 143.9100873(25)  | 2.29(16)×1015 y | α | 140Ce | 0+  | 0.238(3)  | 0.2379–0.2397
145Nd[n 9] | 60  | 85  | 144.9125736(25)  | Observationally Stable[n 10] | 7/2−  | 0.083(1)  | 0.0823–0.0835
146Nd[n 9] | 60  | 86  | 145.9131169(25)  | Observationally Stable[n 10] | 0+  | 0.172(3)  | 0.1706–0.1735
147Nd[n 9] | 60  | 87  | 146.9161004(25)  | 10.98(1) d  | β− | 147Pm  | 5/2−  |  |
148Nd[n 9] | 60  | 88  | 147.916893(3)  | Observationally Stable[n 10] | 0+  | 0.057(1)  | 0.0566–0.0578
149Nd[n 9] | 60  | 89  | 148.920149(3)  | 1.728(1) h  | β− | 149Pm  | 5/2−  |  |
150Nd[n 9][n 11][n 12] | 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)#  | 1.17(4) s[5] | 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−#  |  |

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. ↑ 5.0 5.1 5.2 # - 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

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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. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 9.6 9.7 Fission product
10. ↑ 10.0 10.1 10.2 10.3 Cite error: Invalid `<ref>` tag; no text was provided for refs named `{{{1}}}`
11. ↑ 11.0 11.1 Primordial radionuclide
12. ↑ Predicted to be capable of undergoing triple beta decay and quadruple beta decay with very long partial half-lives

## References

1. ↑ Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; De Bièvre, Paul; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry 88 (3): 265–91. doi:10.1515/pac-2015-0305.
2. ↑ 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. https://link.springer.com/article/10.1557/PROC-257-489.
3. ↑ "Oklo's Natural Nuclear Reactors". 24 October 2020. https://medium.com/predict/oklos-natural-nuclear-reactors-eb2cc3141b48.
4. ↑ "The Implications of the Oklo Phenomenon on the Constancy of Radiometric Decay Rates". https://grisda.org/origins-17086.
5. ↑ Hartley, D. J.; Kondev, F. G.; Carpenter, M. P.; Clark, J. A.; Copp, P.; Kay, B.; Lauritsen, T.; Savard, G. et al. (2023-08-14). "First β−-decay spectroscopy study of 157Nd". Physical Review C (American Physical Society (APS)) 108 (2): 024307. doi:10.1103/physrevc.108.024307. ISSN 2469-9985. Bibcode: 2023PhRvC.108b4307H.

* 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, doi:10.1016/j.nuclphysa.2003.11.001, Bibcode: 2003NuPhA.729....3A, https://hal.archives-ouvertes.fr/in2p3-00020241/document
* Isotopic compositions and standard atomic masses from:
* 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.
* 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, doi:10.1016/j.nuclphysa.2003.11.001, Bibcode: 2003NuPhA.729....3A, https://hal.archives-ouvertes.fr/in2p3-00020241/document
* National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory. http://www.nndc.bnl.gov/nudat2/.
* Lide, David R., ed (2004). "11. Table of the Isotopes". CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.

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* Categories: Isotopes
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