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Isotopes of neodymium

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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, the parent of promethium, 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).

Quick Facts Main isotopes, Decay ...

The primary decay modes for isotopes lighter than the lightest and most abundant stable isotope, which is 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.

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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.[4][5][6]

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List of isotopes

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More information Nuclide, Z ...
  1. [n 1]
    mNd – Excited nuclear isomer.
  2. [n 2]
    ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
  3. [n 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. [n 4]
    Bold half-life – nearly stable, half-life longer than age of universe.
  5. [n 5]
    # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
  6. [n 6]
    Modes of decay:
    EC:Electron capture
    IT:Isomeric transition
    p:Proton emission
  7. [n 7]
    Bold symbol as daughter – Daughter product is stable.
  8. [n 8]
    ( ) spin value – Indicates spin with weak assignment arguments.
  9. [n 9]
    Fission product
  10. [N 10]
    Believed to undergo α decay to 139Ce with a half-life over 1.1×1020 years[9][10]
  11. [N 11]
    Primordial radionuclide
  12. [N 12]
    Believed to undergo α decay to 141Ce with a half-life of over 6.1×1019 years[11][10]
  13. [N 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. [N 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]
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See also

Daughter products other than neodymium

References

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