Isotopes of neodymium

{{Short description|none}} {{Infobox neodymium isotopes}} 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 (t_1/2) of {{val|2.29|e=15}} years) and ¹⁵⁰Nd (double beta decay, t_1/2 of {{val|9.3|e=18}} years), and for practical purposes they can be considered to be stable as well. The radioactivity of ¹⁴⁴Nd is due to it having 84 neutrons (two more than 82, which is a magic number corresponding to a stable neutron configuration), and so it may emit an alpha particle (which has 2 neutrons) to form cerium-140 with 82 neutrons.

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 (t_1/2 5.5 hours), ^135mNd (t_1/2 5.5 minutes) and ^133m1Nd (t_1/2 ~70 seconds).

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.

== 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.<ref>{{cite journal | url=https://link.springer.com/article/10.1557/PROC-257-489 | doi=10.1557/PROC-257-489 | title=U and Nd Isotopes from the New Oklo Reactor 10 (GABON): Evidence for Radioelements Migration | year=1991 | last1=Hemond | first1=C. | last2=Menet | first2=C. | last3=Menager | first3=M.T. | journal=MRS Proceedings | volume=257 | article-number=489 | url-access=subscription }}</ref><ref>{{cite web | url=https://medium.com/predict/oklos-natural-nuclear-reactors-eb2cc3141b48 | title=Oklo's Natural Nuclear Reactors | date=24 October 2020 }}</ref><ref>{{cite web | url=https://grisda.org/origins-17086 | title=The Implications of the Oklo Phenomenon on the Constancy of Radiometric Decay Rates | access-date=2022-11-29 | archive-date=2022-11-29 | archive-url=https://web.archive.org/web/20221129022218/https://grisda.org/origins-17086 | url-status=dead }}</ref>

== List of isotopes == {{Anchor|Neodymium-124|Neodymium-129m|Neodymium-142m}}

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{{Isotopes table |symbol=Nd |refs=NUBASE2020, AME2020 II, <!-- updated 2024-12-30 --> IsotopeFRIB, IsomerFRIB |notes=m, unc(), mass#, exen#, hl#, hl-nst, spin(), spin#, daughter-st, p, EC, IT, discoveryname }} |-id=Neodymium-123 | ¹²³Nd<ref name="suzuki2025">{{cite journal |last1=Suzuki |first1=H |last2=Fukuda |first2=N |last3=Takeda |first3=H |last4=Shimizu |first4=Y |last5=Yoshimoto |first5=M |last6=Togano |first6=Y |last7=Sato |first7=H |last8=Kitamura |first8=N |last9=Hanai |first9=S |last10=Momota |first10=S |last11=Kusaka |first11=K |last12=Yanagisawa |first12=Y |last13=Ohtake |first13=M |last14=Sumikama |first14=T |last15=Fukunishi |first15=N |last16=Michimasa |first16=S |title=Discovery of Proton-Rich Radioactive Isotopes in the Z = 60 Region Produced by the Projectile Fragmentation of a 345-MeV/Nucleon 238U Beam |journal=Progress of Theoretical and Experimental Physics |date=7 November 2025 |volume=2025 |issue=11 |doi=10.1093/ptep/ptaf149|doi-access=free }}</ref> | style="text-align:right" | 60 | style="text-align:right" | 63 | | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/123.pdf 2025] | >310&nbsp;ns | | | | | |-id=Neodymium-124 | ¹²⁴Nd<ref name="suzuki2025"/> | style="text-align:right" | 60 | style="text-align:right" | 64 | 123.95187(54)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/124.pdf 2025] | 500#&nbsp;ms<br>[>310&nbsp;ns] | | | 0+ | | |-id=Neodymium-125 | rowspan=2|¹²⁵Nd | rowspan=2 style="text-align:right" | 60 | rowspan=2 style="text-align:right" | 65 | rowspan=2|124.94840(43)# | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/125.pdf 1999] | rowspan=2|0.65(15)&nbsp;s | β⁺ | ¹²⁵Pr | rowspan=2|(5/2)(+#) | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹²⁴Ce |-id=Neodymium-126 | ¹²⁶Nd<ref name="suzuki2025"/> | style="text-align:right" | 60 | style="text-align:right" | 66 | 125.94269(32)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/126.pdf 2025] | 1#&nbsp;s<br />[>310&nbsp;ns] | | | 0+ | | |-id=Neodymium-127 | rowspan=2|¹²⁷Nd | rowspan=2 style="text-align:right" | 60 | rowspan=2 style="text-align:right" | 67 | rowspan=2|126.93998(32)# | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/127.pdf 1983] | rowspan=2|1.8(4)&nbsp;s | β⁺ | ¹²⁷Pr | rowspan=2|5/2+# | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹²⁶Ce |-id=Neodymium-128 | ¹²⁸Nd | style="text-align:right" | 60 | style="text-align:right" | 68 | 127.93502(22)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/128.pdf 1985] | 5#&nbsp;s | | | 0+ | | |-id=Neodymium-129 | rowspan=2|¹²⁹Nd | rowspan=2 style="text-align:right" | 60 | rowspan=2 style="text-align:right" | 69 | rowspan=2|128.93304(22)# | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/129.pdf 1977] | rowspan=2|6.8(6)&nbsp;s | β⁺ | ¹²⁹Pr | rowspan=2|7/2−<ref name="petrache2023">{{cite journal |last1=Petrache |first1=C. M. |last2=Uusitalo |first2=J. |last3=Briscoe |first3=A. D. |last4=Sullivan |first4=C. M. |last5=Joss |first5=D. T. |last6=Tann |first6=H. |last7=Aktas |first7=ö. |last8=Alayed |first8=B. |last9=Al-Aqeel |first9=M. A. M. |last10=Astier |first10=A. |last11=Badran |first11=H. |last12=Cederwall |first12=B. |last13=Delafosse |first13=C. |last14=Ertoprak |first14=A. |last15=Favier |first15=Z. |last16=Forsberg |first16=U. |last17=Gins |first17=W. |last18=Grahn |first18=T. |last19=Greenlees |first19=P. T. |last20=He |first20=X. T. |last21=Heery |first21=J. |last22=Hilton |first22=J. |last23=Kalantan |first23=S. |last24=Li |first24=R. |last25=Jodidar |first25=P. M. |last26=Julin |first26=R. |last27=Juutinen |first27=S. |last28=Leino |first28=M. |last29=Lewis |first29=M. C. |last30=Li |first30=J. G. |last31=Li |first31=Z. P. |last32=Luoma |first32=M. |last33=Lv |first33=B. F. |last34=McCarter |first34=A. |last35=Nathaniel |first35=S. |last36=Ojala |first36=J. |last37=Page |first37=R. D. |last38=Pakarinen |first38=J. |last39=Papadakis |first39=P. |last40=Parr |first40=E. |last41=Partanen |first41=J. |last42=Paul |first42=E. S. |last43=Rahkila |first43=P. |last44=Ruotsalainen |first44=P. |last45=Sandzelius |first45=M. |last46=Sarén |first46=J. |last47=Smallcombe |first47=J. |last48=Sorri |first48=J. |last49=Szwec |first49=S. |last50=Wang |first50=L. J. |last51=Wang |first51=Y. |last52=Waring |first52=L. |last53=Xu |first53=F. R. |last54=Zhang |first54=J. |last55=Zhang |first55=Z. H. |last56=Zheng |first56=K. K. |last57=Zimba |first57=G. |title=High- K three-quasiparticle isomers in the proton-rich nucleus Nd 129 |journal=Physical Review C |date=19 July 2023 |volume=108 |issue=1 |article-number=014317 |doi=10.1103/PhysRevC.108.014317 |url=https://journals.aps.org/prc/abstract/10.1103/PhysRevC.108.014317}}</ref> | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹²⁸Ce |-id=Neodymium-129m1 | rowspan=2 style="text-indent:1em" | ^129m1Nd | rowspan=2 colspan="3" style="text-indent:2em" | 17&nbsp;keV<ref name="petrache2023"/> | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/129Nd-1.pdf 2010] | rowspan=2|2.6(4)&nbsp;s | β⁺ | ¹²⁹Pr | rowspan=2|1/2+<ref name="petrache2023"/> | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹²⁸Ce |-id=Neodymium-129m2 | rowspan=2 style="text-indent:1em" | ^129m2Nd<ref name="petrache2023"/> | rowspan=2 colspan="3" style="text-indent:2em" | 39&nbsp;keV | rowspan=2 style="text-align:center" | (2023)<ref group="n">Half-life not measured, not included in the discovery database</ref> | rowspan=2|2.6(4)&nbsp;s | β⁺ | ¹²⁹Pr | rowspan=2|3/2+ | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹²⁸Ce |-id=Neodymium-129m3 | rowspan=2 style="text-indent:1em" | ^129m3Nd<ref name="petrache2023"/> | rowspan=2 colspan="3" style="text-indent:2em" | 108&nbsp;keV | rowspan=2 style="text-align:center" | (2023)<ref group="n" | name="short">Half-life shorter than 100ns, not included in discovery database</ref> | rowspan=2| | IT (?%) | ^129m2Nd | rowspan=2|5/2+ | rowspan=2| | rowspan=2| |- | IT (?%) | ¹²⁹Nd |-id=Neodymium-129m4 | style="text-indent:1em" | ^129m4Nd<ref name="petrache2023"/> | colspan="3" style="text-indent:2em" | 1893&nbsp;keV | style="text-align:center" | (2023)<ref group="n" | name=short /> | | IT | ¹²⁹Nd | (17/2+) | | |-id=Neodymium-129m5 | style="text-indent:1em" | ^129m5Nd<ref name="petrache2023"/> | colspan="3" style="text-indent:2em" | 2109&nbsp;keV | style="text-align:center" | (2023)<ref group="n" | name=short /> | | IT | ¹²⁹Nd | (19/2+) | | |-id=Neodymium-129m6 | style="text-indent:1em" | ^129m6Nd<ref name="petrache2023"/> | colspan="3" style="text-indent:2em" | 2284&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/129Nd-2.pdf 2023] | 0.48(4)&nbsp;μs | IT | ¹²⁹Nd | (21/2+) | | |-id=Neodymium-130 | ¹³⁰Nd | style="text-align:right" | 60 | style="text-align:right" | 70 | 129.928506(30) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/130.pdf 1977] | 21(3)&nbsp;s | β⁺ | ¹³⁰Pr | 0+ | | |-id=Neodymium-131 | rowspan=2|¹³¹Nd | rowspan=2 style="text-align:right" | 60 | rowspan=2 style="text-align:right" | 71 | rowspan=2|130.927248(30) | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/131.pdf 1977] | rowspan=2|25.4(9)&nbsp;s | β⁺ | ¹³¹Pr | rowspan=2|(5/2+) | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹³⁰Ce |-id=Neodymium-132 | ¹³²Nd | style="text-align:right" | 60 | style="text-align:right" | 72 | 131.923321(26) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/132.pdf 1977] | 1.56(10)&nbsp;min | β⁺ | ¹³²Pr | 0+ | | |-id=Neodymium-133 | ¹³³Nd | style="text-align:right" | 60 | style="text-align:right" | 73 | 132.922348(50) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/133.pdf 1977] | 70(10)&nbsp;s | β⁺ | ¹³³Pr | (7/2+) | | |-id=Neodymium-133m1 | rowspan=2 style="text-indent:1em" | ^133m1Nd | rowspan=2 colspan="3" style="text-indent:2em" | 127.97(12)&nbsp;keV | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/133Nd-1.pdf 1995] | rowspan=2|~70&nbsp;s | β⁺ (?%) | ¹³³Pr | rowspan=2|(1/2)+ | rowspan=2| | rowspan=2| |- | IT (?%) | ¹³³Nd |-id=Neodymium-133m2 | style="text-indent:1em" | ^133m2Nd | colspan="3" style="text-indent:2em" | 176.10(10)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/133Nd-2.pdf 1995] | 301(18)&nbsp;ns | IT | ¹³³Nd | (9/2–) | | |-id=Neodymium-134 | ¹³⁴Nd | style="text-align:right" | 60 | style="text-align:right" | 74 | 133.918790(13) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/134.pdf 1970] | 8.5(15)&nbsp;min | β⁺ | ¹³⁴Pr | 0+ | | |-id=Neodymium-134m | style="text-indent:1em" | ^134mNd | colspan="3" style="text-indent:2em" | 2293.0(4)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/134Nd-1.pdf 1972] | 389(17)&nbsp;μs | IT | ¹³⁴Nd | 8– | | |-id=Neodymium-135 | ¹³⁵Nd | style="text-align:right" | 60 | style="text-align:right" | 75 | 134.918181(21) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/135.pdf 1970] | 12.4(6)&nbsp;min | β⁺ | ¹³⁵Pr | 9/2– | | |-id=Neodymium-135m | style="text-indent:1em" | ^135mNd | colspan="3" style="text-indent:2em" | 64.95(24)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/135Nd-1.pdf 1972] | 5.5(5)&nbsp;min | β⁺ | ¹³⁵Pr | (1/2+) | | |-id=Neodymium-136 | ¹³⁶Nd | style="text-align:right" | 60 | style="text-align:right" | 76 | 135.914976(13) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/136.pdf 1968] | 50.65(33)&nbsp;min | β⁺ | ¹³⁶Pr | 0+ | | |-id=Neodymium-137 | ¹³⁷Nd | style="text-align:right" | 60 | style="text-align:right" | 77 | 136.914563(13) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/137.pdf 1970] | 38.5(15)&nbsp;min | β⁺ | ¹³⁷Pr | 1/2+ | | |-id=Neodymium-137m | style="text-indent:1em" | ^137mNd | colspan="3" style="text-indent:2em" | 519.43(20)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/137Nd-1.pdf 1970] | 1.60(15)&nbsp;s | IT | ¹³⁷Nd | 11/2– | | |-id=Neodymium-138 | ¹³⁸Nd | style="text-align:right" | 60 | style="text-align:right" | 78 | 137.911951(12) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/138.pdf 1964] | 5.04(9)&nbsp;h | β⁺ | ¹³⁸Pr | 0+ | | |-id=Neodymium-138m | style="text-indent:1em" | ^138mNd | colspan="3" style="text-indent:2em" | 3174.5(4)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/138Nd-1.pdf 1975] | 370(5)&nbsp;ns | IT | ¹³⁸Nd | 10+ | | |-id=Neodymium-139 | ¹³⁹Nd | style="text-align:right" | 60 | style="text-align:right" | 79 | 138.911951(30) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/139.pdf 1951] | 29.7(5)&nbsp;min | β⁺ | ¹³⁹Pr | 3/2+ | | |-id=Neodymium-139m1 | rowspan=2 style="text-indent:1em" | ^139m1Nd | rowspan=2 colspan="3" style="text-indent:2em" | 231.16(5)&nbsp;keV | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/139Nd-1.pdf 1967] | rowspan=2|5.50(20)&nbsp;h | β⁺ (87.0%) | ¹³⁹Pr | rowspan=2|11/2– | rowspan=2| | rowspan=2| |- | IT (13.0%) | ¹³⁹Nd |-id=Neodymium-139m2 | style="text-indent:1em" | ^139m2Nd | colspan="3" style="text-indent:2em" | 2616.9(6)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/139Nd-2.pdf 2008] | 276.8(18)&nbsp;ns | IT | ¹³⁹Nd | 23/2 | | |-id=Neodymium-140 | ¹⁴⁰Nd | style="text-align:right" | 60 | style="text-align:right" | 80 | 139.9095461(35) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/140.pdf 1949] | 3.37(2)&nbsp;d | EC | ¹⁴⁰Pr | 0+ | | |-id=Neodymium-140m1 | style="text-indent:1em" | ^140m1Nd | colspan="3" style="text-indent:2em" | 2221.65(9)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/140Nd-1.pdf 1962] | 600(50)&nbsp;μs | IT | ¹⁴⁰Nd | 7– | | |-id=Neodymium-140m2 | style="text-indent:1em" | ^140m2Nd | colspan="3" style="text-indent:2em" | 7435.1(4)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/140Nd-2.pdf 2006] | 1.22(6)&nbsp;μs | IT | ¹⁴⁰Nd | 20+ | | |-id=Neodymium-141 | rowspan=2|¹⁴¹Nd | rowspan=2 style="text-align:right" | 60 | rowspan=2 style="text-align:right" | 81 | rowspan=2|140.9096167(34) | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/141.pdf 1949] | rowspan=2|2.49(3)&nbsp;h | EC (97.28%) | rowspan=2|'''¹⁴¹Pr''' | rowspan=2|3/2+ | rowspan=2| | rowspan=2| |- | β⁺ (2.72%) |-id=Neodymium-141m | rowspan=2 style="text-indent:1em" | ^141mNd | rowspan=2 colspan="3" style="text-indent:2em" | 756.51(5)&nbsp;keV | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/141Nd-1.pdf 1960] | rowspan=2|62.0(8)&nbsp;s | IT (99.97%) | ¹⁴¹Nd | rowspan=2|11/2– | rowspan=2| | rowspan=2| |- | β⁺ (0.032%) | '''¹⁴¹Pr''' |-id=Neodymium-142 | ¹⁴²Nd | style="text-align:right" | 60 | style="text-align:right" | 82 | 141.9077288(13) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/142.pdf 1924] | colspan=3 align=center|'''Stable''' | 0+ | 0.27153(40) | |-id=Neodymium-142m | style="text-indent:1em" | ^142mNd | colspan="3" style="text-indent:2em" | 2209.303(21)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/142Nd-1.pdf 1964] | 18.6(37)&nbsp;μs | IT | ¹⁴²Nd | 6+ | | |-id=Neodymium-143 | ¹⁴³Nd<ref group="n" name="FP">Fission product</ref> | style="text-align:right" | 60 | style="text-align:right" | 83 | 142.9098198(13) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/143.pdf 1933] | colspan=3 align=center|'''Observationally Stable'''{{#tag:ref|Believed to undergo α decay to ¹³⁹Ce with a half-life over {{val|1.1|e=20|u=years}}<ref name="Nd_2024">{{cite journal |first1=P. |last1=Belli |first2=R. |last2=Bernabei |first3=R. S. |last3=Boiko |first4=F. |last4=Cappella |first5=V. |last5=Caracciolo |first6=R. |last6=Cerulli |first7=F. A. |last7=Danevich |first8=A. |last8=Incicchitti |first9=D. V. |last9=Kasperovych |first10=V. V. |last10=Kobychev |first11=M. |last11=Laubenstein |first12=A. |last12=Leoncini |first13=V. |last13=Merlo |first14=D. V. |last14=Poda |first15=O. G. |last15=Polischuk |first16=N. V. |last16=Sokur |first17=V. I. |last17=Tretyak |title=Search for alpha and double alpha decays of natural Nd isotopes accompanied by gamma quanta |journal=European Physical Journal A |date=1 March 2024 |volume=60 |issue=46 |article-number=46 |doi=10.1140/epja/s10050-024-01260-3 |bibcode=2024EPJA...60...46B |url=https://link.springer.com/article/10.1140/epja/s10050-024-01260-3|url-access=subscription }}</ref><ref name="rare_decays">{{cite journal |last1=Belli |first1=P. |last2=Bernabei |first2=R. |last3=Danevich |first3=F. A. |last4=Incicchitti |first4=A. |last5=Tretyak |first5=V. I. |title=Experimental searches for rare alpha and beta decays |date=2019 |journal=European Physical Journal A |volume=55 |number=140 |pages=4–6 <!--data table--> |doi=10.1140/epja/i2019-12823-2|arxiv=1908.11458 |bibcode=2019EPJA...55..140B |s2cid=201664098}}</ref>|group=n}} | 7/2− | 0.12173(26) | |-id=Neodymium-144 | ¹⁴⁴Nd<ref group="n" name="FP" /><ref group="n" name="PN">Primordial radionuclide</ref> | style="text-align:right" | 60 | style="text-align:right" | 84 | 143.9100928(13) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/144.pdf 1924] | '''2.29(16)×10¹⁵&nbsp;y''' | α | '''¹⁴⁰Ce''' | 0+ | 0.23798(19) | |-id=Neodymium-145 | ¹⁴⁵Nd<ref group="n" name="FP" /> | style="text-align:right" | 60 | style="text-align:right" | 85 | 144.9125792(14) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/145.pdf 1933] | colspan=3 align=center|'''Observationally Stable'''{{#tag:ref|Believed to undergo α decay to ¹⁴¹Ce with a half-life of over {{val|6.1|e=19|u=years}}<ref name="Nd_2023">{{cite conference|url=https://indico.cern.ch/event/1199102/contributions/5477288/|title=Alpha decay of naturally occurring neodymium isotopes|last1=Sokur|first1=N.V.|last2=Belli|first2=P.|last3=Bernabei|first3=R.|last4=Boiko|first4=R.S.|last5=Cappella|first5=F.|last6=Caracciolo|first6=V.|last7=Cerulli|first7=R.|last8=Danevich|first8=F.A.|last9=Incicchitti|first9=A.|last10=Kasperovych|first10=D.V.|last11=Kobychev|first11=V.V.|last12=Laubenstein|first12=M.|last13=Leoncini|first13=A.|last14=Merlo|first14=V.|last15=Polischuk|first15=O.G.|last16=Tretyak|first16=V.I.|date=11 July 2023|conference=XII International Conference on New Frontiers in Physics}}</ref><ref name="rare_decays"/>|group=n}} | 7/2− | 0.08293(12) | |-id=Neodymium-146 | ¹⁴⁶Nd<ref group="n" name="FP" /> | style="text-align:right" | 60 | style="text-align:right" | 86 | 145.9131225(14) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/146.pdf 1924] | colspan=3 align=center|'''Observationally Stable'''{{#tag:ref|Believed to undergo β⁻β⁻ decay to ¹⁴⁶Sm, or α decay to '''¹⁴²Ce''' with a half-life of over {{val|3.3|e=21|u=years}}<ref name="Nd_2023"/><ref name="rare_decays"/>|group=n}} | 0+ | 0.17189(32) | |-id=Neodymium-147 | ¹⁴⁷Nd<ref group="n" name="FP" /> | style="text-align:right" | 60 | style="text-align:right" | 87 | 146.9161060(14) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/147.pdf 1947] | 10.98(1)&nbsp;d | β⁻ | ¹⁴⁷Pm | 5/2− | | |-id=Neodymium-148 | ¹⁴⁸Nd<ref group="n" name="FP" /> | style="text-align:right" | 60 | style="text-align:right" | 88 | 147.9168990(22) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/148.pdf 1937] | colspan=3 align=center|'''Observationally Stable'''{{#tag:ref|Believed to undergo β⁻β⁻ decay to '''''¹⁴⁸Sm''''' with a half-life over {{val|3|e=18|u=years}}, or α decay to ¹⁴⁴Ce with a half-life of over {{val|1.2|e=19|u=years}}<ref name="Nd_2023"/><ref name="rare_decays"/>|group=n}} | 0+ | 0.05756(21) | |-id=Neodymium-149 | ¹⁴⁹Nd<ref group="n" name="FP" /> | style="text-align:right" | 60 | style="text-align:right" | 89 | 148.9201546(22) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/149.pdf 1938] | 1.728(1)&nbsp;h | β⁻ | ¹⁴⁹Pm | 5/2− | | |-id=Neodymium-150 | ¹⁵⁰Nd<ref group="n" name="FP" /><ref group="n" name="PN" /> | style="text-align:right" | 60 | style="text-align:right" | 90 | 149.9209013(12) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/150.pdf 1937] | '''9.3(7)×10¹⁸&nbsp;y''' | β⁻β⁻ | '''¹⁵⁰Sm''' | 0+ | 0.05638(28) | |-id=Neodymium-151 | ¹⁵¹Nd | style="text-align:right" | 60 | style="text-align:right" | 91 | 150.9238394(12) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/151.pdf 1938] | 12.44(7)&nbsp;min | β⁻ | ¹⁵¹Pm | 3/2+ | | |-id=Neodymium-152 | ¹⁵²Nd | style="text-align:right" | 60 | style="text-align:right" | 92 | 151.924691(26) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/152.pdf 1969] | 11.4(2)&nbsp;min | β⁻ | ¹⁵²Pm | 0+ | | |-id=Neodymium-153 | ¹⁵³Nd | style="text-align:right" | 60 | style="text-align:right" | 93 | 152.9277179(29) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/153.pdf 1987] | 31.6(10)&nbsp;s | β⁻ | ¹⁵³Pm | (3/2)− | | |-id=Neodymium-153m | style="text-indent:1em" | ^153mNd | colspan="3" style="text-indent:2em" | 191.71(16)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/153Nd-1.pdf 1996] | 1.10(4)&nbsp;μs | IT | ¹⁵³Nd | (5/2)+ | | |-id=Neodymium-154 | ¹⁵⁴Nd | style="text-align:right" | 60 | style="text-align:right" | 94 | 153.9295974(11) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/154.pdf 1970] | 25.9(2)&nbsp;s | β⁻ | ¹⁵⁴Pm | 0+ | | |-id=Neodymium-154m | style="text-indent:1em" | ^154mNd | colspan="3" style="text-indent:2em" | 1297.9(4)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/154Nd-1.pdf 2009] | 3.2(3)&nbsp;μs | IT | ¹⁵⁴Nd | (4−) | | |-id=Neodymium-155 | ¹⁵⁵Nd | style="text-align:right" | 60 | style="text-align:right" | 95 | 154.9331356(98) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/155.pdf 1986] | 8.9(2)&nbsp;s | β⁻ | ¹⁵⁵Pm | (3/2−) | | |-id=Neodymium-156 | ¹⁵⁶Nd | style="text-align:right" | 60 | style="text-align:right" | 96 | 155.9353704(14) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/156.pdf 1987] | 5.06(13)&nbsp;s | β⁻ | ¹⁵⁶Pm | 0+ | | |-id=Neodymium-156m | style="text-indent:1em" | ^156mNd | colspan="3" style="text-indent:2em" | 1431.3(4)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/156Nd-1.pdf 1998] | 365(145)&nbsp;ns | IT | ¹⁵⁶Nd | 5− | | |-id=Neodymium-157 | ¹⁵⁷Nd | style="text-align:right" | 60 | style="text-align:right" | 97 | 156.9393511(23) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/157.pdf 2012] | 1.17(4)&nbsp;s<ref>{{cite journal | last1=Hartley | first1=D. J. | last2=Kondev | first2=F. G. | last3=Carpenter | first3=M. P. | last4=Clark | first4=J. A. | last5=Copp | first5=P. | last6=Kay | first6=B. | last7=Lauritsen | first7=T. | last8=Savard | first8=G. | last9=Seweryniak | first9=D. | last10=Wilson | first10=G. L. | last11=Wu | first11=J. | title=First β⁻-decay spectroscopy study of ¹⁵⁷Nd | journal=Physical Review C | publisher=American Physical Society (APS) | volume=108 | issue=2 | date=2023-08-14 | article-number=024307 | issn=2469-9985 | doi=10.1103/physrevc.108.024307| bibcode=2023PhRvC.108b4307H | s2cid=260913513 }}</ref> | β⁻ | ¹⁵⁷Pm | 5/2−# | | |-id=Neodymium-158 | ¹⁵⁸Nd | style="text-align:right" | 60 | style="text-align:right" | 98 | 157.9422056(14) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/158.pdf 2012] | 810(30)&nbsp;ms | β⁻ | ¹⁵⁸Pm | 0+ | | |-id=Neodymium-158m | style="text-indent:1em" | ^158mNd | colspan="3" style="text-indent:2em" | 1648.1(14)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/158Nd-1.pdf 2016] | 339(20)&nbsp;ns | IT | ¹⁵⁸Nd | (6−) | | |-id=Neodymium-159 | ¹⁵⁹Nd | style="text-align:right" | 60 | style="text-align:right" | 99 | 158.946619(32) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/159.pdf 2012] | 500(30)&nbsp;ms | β⁻ | ¹⁵⁹Pm | 7/2+# | | |-id=Neodymium-160 | ¹⁶⁰Nd | style="text-align:right" | 60 | style="text-align:right" | 100 | 159.949839(50) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/160.pdf 2012] | 439(37)&nbsp;ms | β⁻ | ¹⁶⁰Pm | 0+ | | |-id=Neodymium-160m | style="text-indent:1em" | ^160mNd | colspan="3" style="text-indent:2em" | 1107.9(9)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/60/160Nd-1.pdf 2016] | 1.63(21)&nbsp;μs | IT | ¹⁶⁰Nd | (4−) | | |-id=Neodymium-161 | ¹⁶¹Nd | style="text-align:right" | 60 | style="text-align:right" | 101 | 160.95466(43)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/161.pdf 2012] | 215(76)&nbsp;ms | β⁻ | ¹⁶¹Pm | 1/2−# | | |-id=Neodymium-162 | ¹⁶²Nd | style="text-align:right" | 60 | style="text-align:right" | 102 | 161.95812(43)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/162.pdf 2017] | 310(200)&nbsp;ms | β⁻ | ¹⁶²Pm | 0+ | | |-id=Neodymium-163 | ¹⁶³Nd | style="text-align:right" | 60 | style="text-align:right" | 103 | 162.96341(54)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/60/163.pdf 2018] | 80#&nbsp;ms<br />[>550&nbsp;ns] | | | 5/2−# | | {{Isotopes table/footer}}

== See also == '''Daughter products other than neodymium''' * Isotopes of samarium * Isotopes of promethium * Isotopes of praseodymium * Isotopes of cerium

== References == {{Reflist}} * Isotope masses from: **{{NUBASE 2003}} * Isotopic compositions and standard atomic masses from: **{{CIAAW2003}} **{{CIAAW 2005}} * Half-life, spin, and isomer data selected from the following sources. **{{NUBASE 2003}} **{{NNDC}} **{{CRC85|chapter=11}}

{{Navbox element isotopes}}

Category:Isotopes of neodymium Category:Neodymium Neodymium