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Isotopes of Neodymium

List, data and properties of all known isotopes of Neodymium.

Content
Atomic properties
Decay properties
NMR active nuclides
Radiation protection
References
Neodymium isotopes

All atomic nuclei of the chemical element neodymium are summarized under neodymium isotopes; these all consist of an atomic nucleus with 60 protons and, in the uncharged state, 60 electrons. The difference between each neodymium isotope is based on the number of neutrons in the nucleus.

 

Naturally Occurring Neodymium Isotopes

Neodymium or neodymium is a chemical element from the group of rare earth metals (rare earths).

Natural occurrences of neodymium consist of 7 nuclides: five stable and two radioisotopes.

Atomic Mass maQuantityHalf-lifeSpin
Neodymium
Isotopic mixture		144,242 u100 %
Isotope 142Nd141,90773(2) u27,153(40) %stable0+
Isotope 143Nd142,90982(2) u12,173(26) %stable7/2-
Isotope 144Nd143,9100928(13) u23,798(19) %2.29(16) × 1015 a0+
Isotope 145Nd144,91258(2) u8,293(12) %stable7/2-
Isotope 146Nd145,91312(2) u17,189(32) %stable0+
Isotope 148Nd147,91690(2) u5,756(21) %stable0+
Isotope 150Nd149,92090(2) u5,638(28) %6.7(7) × 1018 a0+

 

In addition, more than 30 other neodymium isotopes and a whole series of nuclear isomers (accessed via column 14) have been characterized and are listed in the following isotope table.

 

Isotope Table: Neodymium

The two following tables list the most important data and properties of the Neodymium isotopes. Further information on the individual Neodymium isotopes is listed on separate pages and can be accessed via the link in column 1.

 

Atomic Properties

Isotope
Nuclide		ENAtomic Mass
[Nuclear Mass]
{Mass Excess}		Spin I
(h/2π)		Parent
123456
Neodymium-12412460Nd64123.95223(64) u
[123.9193177 u]
{-44.49747 MeV}		0+
Neodymium-12512560Nd65124.94890(43) u
[124.9159877 u]
{-47.59934 MeV}		(5/2)
Neodymium-12612660Nd66125.94311(32) u
[125.9101977 u]
{-52.99269 MeV}		0+126Pm
Neodymium-12712760Nd67126.94038(32) u
[126.9074677 u]
{-55.53567 MeV}		5/2+127Pm
Neodymium-12812860Nd68127.93525(21) u
[127.9023377 u]
{-60.31424 MeV}		0+128Pm
Neodymium-12912960Nd69128.93310(22) u
[128.9001877 u]
{-62.31695 MeV}		(5/2+)129Pm
Neodymium-13013060Nd70129.92851(3) u
[129.8955977 u]
{-66.59251 MeV}		0+130Pm
Neodymium-13113160Nd71130.92725(3) u
[130.8943377 u]
{-67.76619 MeV}		(5/2+)131Pm
Neodymium-13213260Nd72131.923321(26) u
[131.8904087 u]
{-71.42603 MeV}		0+132Pm
Neodymium-13313360Nd73132.92235(5) u
[132.8894377 u]
{-72.33051 MeV}		(7/2+)133Pm
Neodymium-133m1133m160Nd73132.92235(5) u
[132.8894377 u]
{-72.33051 MeV}		(1/2+)
Neodymium-133m2133m260Nd73132.92235(5) u
[132.8894377 u]
{-72.33051 MeV}		(9/2-)
Neodymium-13413460Nd74133.918790(13) u
[133.8858777 u]
{-75.64663 MeV}		0+134Pm
Neodymium-134m134m60Nd74133.918790(13) u
[133.8858777 u]
{-75.64663 MeV}		(8)-
Neodymium-13513560Nd75134.918181(21) u
[134.8852687 u]
{-76.21391 MeV}		9/2(-)135Pm
Neodymium-135m135m60Nd75134.918181(21) u
[134.8852687 u]
{-76.21391 MeV}		(1/2+)
Neodymium-13613660Nd76135.914976(13) u
[135.8820637 u]
{-79.19935 MeV}		0+136Pm
Neodymium-13713760Nd77136.914562(13) u
[136.8816497 u]
{-79.58498 MeV}		1/2+137Pm
Neodymium-137m137m60Nd77136.914562(13) u
[136.8816497 u]
{-79.58498 MeV}		11/2-
Neodymium-13813860Nd78137.911950(12) u
[137.8790377 u]
{-82.01805 MeV}		0+138Pm
Neodymium-138m138m60Nd78137.911950(12) u
[137.8790377 u]
{-82.01805 MeV}		10+
Neodymium-13913960Nd79138.91195(3) u
[138.8790377 u]
{-82.01805 MeV}		3/2+139Pm
Neodymium-139m1139m160Nd79138.91195(3) u
[138.8790377 u]
{-82.01805 MeV}		11/2-
Neodymium-139m2139m260Nd79138.91195(3) u
[138.8790377 u]
{-82.01805 MeV}		(23/2+)
Neodymium-14014060Nd80139.909544(4) u
[139.8766317 u]
{-84.25922 MeV}		0+140Pm
Neodymium-140m140m60Nd80139.909544(4) u
[139.8766317 u]
{-84.25922 MeV}		7-
Neodymium-14114160Nd81140.909615(4) u
[140.8767027 u]
{-84.19309 MeV}		3/2+141Pm
Neodymium-141m141m60Nd81140.909615(4) u
[140.8767027 u]
{-84.19309 MeV}		11/2-
Neodymium-14214260Nd82141.90773(2) u
[141.8748177 u]
{-85.94895 MeV}		0+142Pm
142Pr
142Ce
146Sm
Neodymium-14314360Nd83142.90982(2) u
[142.8769077 u]
{-84.00213 MeV}		7/2-143Pm
143Pr
147Sm
Neodymium-14414460Nd84143.9100928(13) u
[143.8771805 u]
{-83.74802 MeV}		0+144Pm
144Pr
148Sm
Neodymium-14514560Nd85144.91258(2) u
[144.8796677 u]
{-81.43121 MeV}		7/2-145Pm
145Pr
149Sm
Neodymium-14614660Nd86145.91312(2) u
[145.8802077 u]
{-80.9282 MeV}		0+146Pm
146Pr
Neodymium-14714760Nd87146.9161060(15) u
[146.8831937 u]
{-78.14676 MeV}		5/2-147Pr
Neodymium-14814860Nd88147.91690(2) u
[147.8839877 u]
{-77.40715 MeV}		0+148Pm
148Pr
Neodymium-14914960Nd89148.9201546(23) u
[148.8872423 u]
{-74.37551 MeV}		5/2-149Pr
Neodymium-15015060Nd90149.92090(2) u
[149.8879877 u]
{-73.68118 MeV}		0+150Pm
150Pr
Neodymium-15115160Nd91150.9238396(14) u
[150.8909273 u]
{-70.94296 MeV}		3/2+151Pr
Neodymium-15215260Nd92151.924692(26) u
[151.8917797 u]
{-70.14895 MeV}		0+152Pr
Neodymium-15315360Nd93152.9277179(29) u
[152.8948056 u]
{-67.33034 MeV}		(3/2)-153Pr
Neodymium-15415460Nd94153.92933(6) u
[153.8964177 u]
{-65.82868 MeV}		0+154Pr
Neodymium-15515560Nd95154.933136(10) u
[154.9002237 u]
{-62.28341 MeV}		3/2-~155Pr
Neodymium-15615660Nd96155.93508(21) u
[155.9021677 u]
{-60.47259 MeV}		0+156Pr
Neodymium-15715760Nd97156.939386(27) u
[156.9064737 u]
{-56.46158 MeV}		(5/2-)157Pr
Neodymium-15815860Nd98157.94197(21) u
[157.9090577 u]
{-54.0546 MeV}		0+158Pr
Neodymium-15915960Nd99158.94653(32) u
[158.9136177 u]
{-49.80698 MeV}		(7/2+)159Pr
Neodymium-16016060Nd100159.94940(32) u
[159.9164877 u]
{-47.1336 MeV}		0+
Neodymium-16116160Nd101160.95428(43) u
[160.9213677 u]
{-42.58791 MeV}		(1/2-)
Neodymium-16216260Nd102161.95812(43) u
[161.9252077 u]
{-39.01097 MeV}		0+
Neodymium-16316360Nd103162.96341(54) u
[162.9304977 u]
{-34.08337 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayExtern
Half-lifeDecay ModeProbabilityEnergy
789101112
Nd-124500~ msAL
Nd-1250.65(15) sEC/β+ → 125Pr
EC, p → 124Ce		> 99 %
≤≤ 1 %		10.34(50) MeV
AL
Nd-126< 1 sEC/β+ → 126Pr
EC, p → 125Ce		?
?		7.33(36) MeV
AL
Nd-1271.8(4) sEC/β+ → 127Pr
EC, p → 126Ce		100 %
?		9.01(36) MeV
AL
Nd-1285 sEC/β+ → 128Pr
EC, p → 127Ce		100 %
?		6.02(20) MeV
AL
Nd-1296.7(4) sEC/β+ → 129Pr
EC, p → 128Ce		100 %
> 0 %		7.46(20) MeV
AL
Nd-13013(3) sβ+ → 130Pr100 %4.58(7) MeVAL
Nd-13125.4(9) sEC/β+ → 131Pr
EC, p → 130Ce		100 %
> 0 %		6.53(5) MeV
AL
Nd-13294(8) sEC/β+ → 132Pr100 %3.80(4) MeVAL
Nd-13370(10) sEC/β+ → 133Pr100 %5.61(5) MeVAL
Nd-133m170 sEC/β+ → 133Pr
Iso → 133Nd		?
?
AL
Nd-133m2301(18) nsAL
Nd-1348.5(15) minEC/β+ → 134Pr100 %2.882(24) MeVAL
Nd-134m410(30) μsIso → 134Nd100 %AL
Nd-13512.4(6) minEC/β+ → 135Pr100 %4.722(22) MeVAL
Nd-135m5.5(5) minβ+ → 135Pr
Iso → 135Nd		> 99.97 %
< 0.03 %
AL
Nd-13650.65(33) minEC/β+ → 136Pr100 %2.21 MeVAL
Nd-13738.5(15) minEC/β+ → 137Pr100 %3.617(14) MeVAL
Nd-137m1.60(15) sIso → 137Nd100 %AL
Nd-1385.04(9) hEC/β+ → 138Pr100 %1.116(16) MeVAL
Nd-138m370(5) nsAL
Nd-13929.7(5) minEC/β+ → 139Pr100 %2.805(29) MeVAL
Nd-139m15.50(20) hEC/β+ → 139Pr
Iso → 139Nd		87.0(10) %
13.0(10) %		?
0.231 MeV		AL
Nd-139m2277(2) nsIso → 139Nd100 %
Nd-1403.37(2) dEC → 140Pr100 %0.429(7) MeVAL
Nd-140m0.60(5) msIso → 140Nd100 %AL
Nd-1412.49(3) hEC/β+ → 141Pr100 %1.823(4) MeVAL
Nd-141m62.0(8) sβ+ → 141Pr
Iso → 141Nd		< 0.05 %
99.95 %
AL
Nd-142stableAL
Nd-143stableAL
Nd-1442.29(16) × 1015 aα → 140Ce100 %1.9013(15) MeVAL
Nd-145stableAL
Nd-146stableAL
Nd-14710.98(1) dβ- → 147Pm100 %0.8955(5) MeVAL
Nd-148stable2 β- → 148Sm?AL
Nd-1491.728(1) hβ- → 149Pm100 %1.6888(25) MeVAL
Nd-1506.7(7) × 1018 a2 β- → 150Sm100 %AL
Nd-15112.44(7) minβ- → 151Pm100 %2.443(4) MeVAL
Nd-15211.4(2) minβ- → 152Pm100 %1.105(19) MeVAL
Nd-15331.6(10) sβ- → 153Pm100 %3.318(9) MeVAL
Nd-15425.9(2) sβ- → 154Pm100 %2.687(25) MeVAL
Nd-1558.9(2) sβ- → 155Pm100 %4.656(10) MeVAL
Nd-1565.26(20) sβ- → 156Pm100 %3.69(20) MeVAL
Nd-1571.15(3) sβ- → 157Pm100 %5.835(26) MeVAL
Nd-158820 msβ- → 158Pm
β-, n → 157Pm		100 %
?		5.03(20) MeV
0.17(20) MeV		AL
Nd-159485 msβ- → 159Pm
β-, n → 158Pm		100 %
?		6.75(30) MeV
1.21(30) MeV		AL
Nd-1600.44(4) sβ- → 160Pm
β-, n → 159Pm		100 %
?		5.87(36) MeV
1.35(30) MeV		AL
Nd-1610.22(8) sβ- → 161Pm
β-, n → 160Pm		100 %
?		7.65(50) MeV
2.34(45) MeV		AL
Nd-1620.31(20) sβ- → 162Pm
β-, n → 161Pm		100 %
?		7.030(500) MeV
3.005(400) MeV
Nd-163β- → 163Pm
β-, n → → 162Pm		100 %
?		8.880(640) MeV
3.889(583) MeV

 

Notes (related to the columns):

1 - name of the nuclide, isotope.
2 - E: isotope symbol with mass number (superscript; number of nucleons) and Atomic number (subscript; number of protons).
3 - N: number of neutrons.
4 - relative atomic mass of the Neodymium isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
5 - nuclear spin I, unit: h/2π.
6 - source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.

7 - isotope notation in short form.
8 - decay: half-live of the Neodymium isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
9 - decay mode: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
10 - decay probability in percent (%).
11 - decay energy; Particle energy related to decay type.
12 - other information and notes: AL = Adopted Levels (link to external data [1]).

Miscellaneous:

()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
  - unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.

 

NMR active Neodymium nuclides

Nuclide
quantity 1)
spin		Nuclear
magnetic
moment
μ/μN		Gyromagnetic ratio
{Quadrupole moment}		Resonant
frequency
v0 bei 1 T		Relative
sensitivity
H0 = const.
v0 = const. 3)
143Nd
12,173(26) %
7/2-		- 1,0651,474
{- 0,63(6)}		2,3190,00339
1,1440
145Nd
8,293(12) %
7/2-		- 0,6560,913
{-0,330(30)}		1,4290,00079
0,7047

1) Quantity Percentage of natural occurrence.

2) Gyromagnetic ratio: 107 rad T-1 s-1
    Quadrupole moment: Q [barn] = [100 fm2]

3) Related to 1H = 1,000.

 

Radiation Protection

According to the Radiation Protection Ordinance (StrlSchV 2018, Germany), the following values (columns 1 to 7) apply to the handling of Neodymium radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Nd-136+106 Bq100 Bq/g50.7 min
Nd-138+107 Bq1000 Bq/g5.0 h
Nd-139106 Bq100 Bq/g29.7 min
Nd-139m+106 Bq10 Bq/g5.5 h
Nd-141107 Bq100 Bq/g2.5 h
Nd-147106 Bq100 Bq/g0,6 TBq10 Bq cm-211 d
Nd-149106 Bq100 Bq/g10 Bq cm-21.7 h
Nd-151105 Bq10 Bq/g12.4 min

(HASS = High-Activity Sealed Radioactive Sources; SC = surface contamination)

 

Literature Sources and References

Properties of the Neodymium nucleides

[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.

[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.

[3] - Live Chart of Nuclides. Nuclear structure and decay data.

Neodymium: NMR properties - 143Nd-NMR, 145Nd-NMR

[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.

[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.

[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.

[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).

More sources:

[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.

[9] - J.L. Gross, J. Claes, J. Kathawa, M. Thoennessen:
Discovery of zinc, selenium, bromine, and neodymium isotopes.
In: Atomic Data and Nuclear Data Tables, (2012), DOI 10.1016/j.adt.2011.12.001.

 

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