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Isotopes of Lanthanum

List, data and properties of all known isotopes of Lanthanum as well as radioactive decay products and intermediate products.

 

Lanthanum isotopes

All atomic nuclei of the chemical element lanthanum are summarized under lanthanum isotopes; these all consist of an atomic nucleus with 57 protons and, in the uncharged state, 57 electrons. The difference between each isotope of lanthanum is based on the number of neutrons in the nucleus.

 

Naturally Occurring Lanthanum Isotopes

Two lanthanum nuclides occur in nature: lanthanum-139 and lanthanum-138, which decays radioactively with a half-life of 1011 years. The other lanthanum isotopes decay radioactively; La-137 has a half-life of about 60,000 years. The radioactive lanthanum nuclides are currently not used for technical or medical purposes.

Atomic Mass maQuantityHalf-lifeSpin
Lanthanum
Isotopic mixture
138,90547 u100 %
Isotope 138La137,907118(3) u0,08881(71) %1.02(1) × 1011 a5+
Isotope 139La138,90636(2) u99,91119(71) %stable7/2+

 

Isotope Table: Lanthanum

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
116La5711659Lanthanum-116
117La5711760Lanthanum-117116.95011(21) u
[116.9188431 u]
{-46.47224 MeV}
(3/2)+-
117mLa5711760Lanthanum-117m116.95011(21) u
[116.9188431 u]
{-46.47224 MeV}
(9/2+)
118La5711861Lanthanum-118117.94673(32) u
[117.9154631 u]
{-49.62069 MeV}
119La5711962Lanthanum-119118.94099(43) u
[118.9097231 u]
{-54.96746 MeV}
11/2-~119Ce
120La5712063Lanthanum-120119.93820(32) u
[119.9069331 u]
{-57.56633 MeV}
120Ce
121La5712164Lanthanum-121120.93324(32) u
[120.9019731 u]
{-62.18654 MeV}
(11/2-)121Ce
122La5712265Lanthanum-122121.93071(32) u
[121.8994431 u]
{-64.54322 MeV}
122Ce
123La5712366Lanthanum-123122.92630(21) u
[122.8950331 u]
{-68.65111 MeV}
(11/2-)123Ce
124La5712467Lanthanum-124123.92457(6) u
[123.8933031 u]
{-70.26259 MeV}
8-124Ce
124mLa5712467Lanthanum-124m123.92457(6) u
[123.8933031 u]
{-70.26259 MeV}
(8-)
125La5712568Lanthanum-125124.920816(28) u
[124.8895491 u]
{-73.75942 MeV}
(3/2+)125Ce
125mLa5712568Lanthanum-125m124.920816(28) u
[124.8895491 u]
{-73.75942 MeV}
126La5712669Lanthanum-126125.91951(10) u
[125.8882431 u]
{-74.97595 MeV}
(5+)126Ce
126mLa5712669Lanthanum-126m125.91951(10) u
[125.8882431 u]
{-74.97595 MeV}
127La5712770Lanthanum-127126.916375(28) u
[126.8851081 u]
{-77.89619 MeV}
(11/2-)127Ce
127mLa5712770Lanthanum-127m126.916375(28) u
[126.8851081 u]
{-77.89619 MeV}
(3/2+)
128La5712871Lanthanum-128127.91559(6) u
[127.8843231 u]
{-78.62741 MeV}
(5+)128Ce
128mLa5712871Lanthanum-128m127.91559(6) u
[127.8843231 u]
{-78.62741 MeV}
(1+,2-)
129La5712972Lanthanum-129128.912694(23) u
[128.8814271 u]
{-81.32502 MeV}
(3/2+)129Ce
129mLa5712972Lanthanum-129m128.912694(23) u
[128.8814271 u]
{-81.32502 MeV}
(11/2-)
130La5713073Lanthanum-130129.912369(28) u
[129.8811021 u]
{-81.62775 MeV}
3(+)130Ce
131La5713174Lanthanum-131130.91007(3) u
[130.8788031 u]
{-83.76926 MeV}
3/2+131Ce
131mLa5713174Lanthanum-131m130.91007(3) u
[130.8788031 u]
{-83.76926 MeV}
11/2-
132La5713275Lanthanum-132131.91012(4) u
[131.8788531 u]
{-83.72268 MeV}
2-132Ce
132mLa5713275Lanthanum-132m131.91012(4) u
[131.8788531 u]
{-83.72268 MeV}
6-
133La5713376Lanthanum-133132.90822(3) u
[132.8769531 u]
{-85.49252 MeV}
5/2+133Ce
134La5713477Lanthanum-134133.908514(21) u
[133.8772471 u]
{-85.21866 MeV}
1+134Ce
135La5713578Lanthanum-135134.906985(10) u
[134.8757181 u]
{-86.64291 MeV}
5/2++3.70(9)135Ce
136La5713679Lanthanum-136135.90763(6) u
[135.8763631 u]
{-86.0421 MeV}
1++ 3.7
136mLa5713679Lanthanum-136m135.90763(6) u
[135.8763631 u]
{-86.0421 MeV}
(7-)
137La5713780Lanthanum-137136.9064506(18) u
[136.8751837 u]
{-87.1407 MeV}
7/2++2.696(6)137Ce
138La5713881Lanthanum-138137.907118(3) u
[137.8758511 u]
{-86.51903 MeV}
5++3.7084(2)
138mLa5713881Lanthanum-138m137.907118(3) u
[137.8758511 u]
{-86.51903 MeV}
(3)++2.89(5)
139La5713982Lanthanum-139138.90636(2) u
[138.8750931 u]
{-87.2251 MeV}
7/2++2.7791(2)139Ce
139Ba
140La5714083Lanthanum-140139.9094832(22) u
[139.8782163 u]
{-84.31586 MeV}
3-+ 0.730(15)140Ba
141La5714184Lanthanum-141140.910969(5) u
[140.8797021 u]
{-82.93184 MeV}
(7/2+)141Ba
142La5714285Lanthanum-142141.914090(7) u
[141.8828231 u]
{-80.02465 MeV}
2-142Ba
143La5714386Lanthanum-143142.916079(8) u
[142.8848121 u]
{-78.17191 MeV}
(7/2)+143Ba
144La5714487Lanthanum-144143.919646(14) u
[143.8883791 u]
{-74.84927 MeV}
(3-)144Ba
145La5714588Lanthanum-145144.921808(13) u
[144.8905411 u]
{-72.83538 MeV}
(5/2+)145Ba
146La5714689Lanthanum-146145.92587(4) u
[145.8946031 u]
{-69.05165 MeV}
2-146Ba
146mLa5714689Lanthanum-146m145.92587(4) u
[145.8946031 u]
{-69.05165 MeV}
(6-)
147La5714790Lanthanum-147146.928418(11) u
[146.8971511 u]
{-66.6782 MeV}
(3/2+)147Ba
148La5714891Lanthanum-148147.932679(21) u
[147.9014121 u]
{-62.70911 MeV}
(2-)148Ba
149La5714992Lanthanum-149148.93535(21) u
[148.9040831 u]
{-60.22109 MeV}
(3/2-)149Ba
150La5715093Lanthanum-150149.93974(47) u
[149.9084731 u]
{-56.13183 MeV}
(3+)150Ba
151La5715194Lanthanum-151150.94277(47) u
[150.9115031 u]
{-53.3094 MeV}
(1/2+)151Ba
152La5715295Lanthanum-152151.94708(32) u
[151.9158131 u]
{-49.29466 MeV}
(2-)152Ba
153La5715396Lanthanum-153152.95055(32) u
[152.9192831 u]
{-46.06238 MeV}
(1/2+)153Ba
154La5715497Lanthanum-154153.95542(32) u
[153.9241531 u]
{-41.526 MeV}
(2-)
155La5715598Lanthanum-155154.95928(43) u
[154.9280131 u]
{-37.93044 MeV}
(1/2+)
156La5715699Lanthanum-156155.96452(43) u
[155.9332531 u]
{-33.04941 MeV}
(4+)

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
La-116AL
La-11723.5(25) msp → 116Ba
β+117Ba
93.9(7) %
6.1(7) %

10.99(32) MeV
AL
La-117m10(5) msp → 116Ba
β+117Ba
97.4(13) %
2.6(13) %

151(12) keVAL
La-118~200 msβ+118Ba
β+


AL
La-119~1 sβ+119BaAL
La-1202.8(2) sEC/β+120Ba
EC, p → 119Cs
< 100 %
> 0 %
11.32(42) MeV
AL
La-1215.3(2) sβ+121Ba100 %8.55(33) MeVAL
La-1228.6(5) sEC/β+122Ba
EC, p → 121Cs
100 %
?
10.07(30) MeV
AL
La-12317(3) sEC/β+123Ba100 %7.00(20) MeVAL
La-12421(4) sEC/β+124Ba100 %8.83(6) MeVAL
La-124m29.21(17) sEC/β+124Ba100 %100 keVAL
La-12564.8(12) sEC/β+125Ba100 %5.909(28) MeVAL
La-125m0.39(4) s107.00(10) keVAL
La-12654(2) sEC/β+126Ba?7.79(9) MeVAL
La-126m50 sEC/β+126Ba
Iso → 126La
?
?

+z keVAL
La-1275.1(1) minEC/β+127Ba100 %4.922(28) MeVAL
La-127m3.7(4) minEC/β+127Ba100 %14.2(4) keVAL
La-1285.18(14) minEC/β+128Ba100 %6.75(5) MeVAL
La-128m1.4 minEC → 128Ba100 %~ 100 keVAL
La-12911.6(2) minβ+129Ba100 %3.739(24) MeVAL
La-129m0.56(5) sIso → 129La100 %172.33(20) keVAL
La-1308.7(1) minEC/β+130Ba5.634(26) MeVAL
La-13159(2) minEC/β+131Ba100 %2.914(28) MeVAL
La-131m170(7) μsIso → 131La100 %304.52(24) keVAL
La-1324.8(2) hEC/β+132Ba100 %4.71(4) MeVAL
La-132m24.3(5) minIso → 132La
EC/β+132Ba
76 %
24 %

188.20(11) keVAL
La-1333.912(8) hEC/β+133Ba100 %2.059(28) MeVAL
La-1346.45(16) minEC/β+134Ba100 %3.731(20) MeVAL
La-13519.5(2) hEC/β+135Ba100 %1.207(9) MeVAL
La-1369.87(3) minEC/β+136Ba100 %2.85(5) MeVAL
La-136m114(5) msIso → 136La100 %259.5(3) keVAL
La-13760000 aEC → 137Ba100 %0.5805(17) MeVAL
La-1381.02(1) × 1011 aβ+138Ba
β-138Ce
65.6(5) %
34.4(5) %
1.742(3) MeV
1.052(4) MeV
AL
La-138m116(5) ns72.57(3) keVAL
La-139stableAL
La-1401.67858(21) dβ-140Ce100 %3.7602(17) MeVAL
La-1413.92(3) hβ-141Ce100 %2.501(4) MeVAL
La-14291.1(5) minβ-142Ce100 %4.509(6) MeVAL
La-14314.2(1) minβ-143Ce100 %3.435(8) MeVAL
La-14440.8(4) sβ-144Ce100 %5.582(13) MeVAL
La-14524.8(20) sβ-145Ce100 %4.23(4) MeVAL
La-1466.1(3) sβ-146Ce
β-, n → 145Ce
99.99 %
0.007 %
6.59(3) MeV
AL
La-146m9.8(4) sβ-146Ce
Iso → 146La
100 %
?
6.7 MeV
130(130) keVAL
La-1474.06(4) sβ-147Ce
β-, n → 146Ce
99.96 %
0.041(4) %
5.336(14) MeV
0.886(20) MeV
AL
La-1481.26(8) sβ-148Ce
β-, n → 147Ce
99.85 %
0.15(3) %
7.690(22) MeV
1.234(21) MeV
AL
La-1491.05(3) sβ-149Ce
β-, n → 148Ce
98.6 %
1.43(28) %
6.45(20) MeV
2.11(20) MeV
AL
La-1500.59(11) sβ-150Ce
β-, n → 149Ce
97.3 %
2.7(3) %
8.72(44) MeV
2.47(44) MeV
AL
La-151457 msβ-151Ce
β-, n → 150Ce
100 %
?
7.91(44) MeV
3.47(44) MeV
AL
La-152298 msβ-152Ce
β-, n → 151Ce
100 %
?
9.69(36) MeV
3.86(20) MeV
AL
La-153245(18) msβ-153Ce
β-, n → 152Ce
100 %
?
8.85(36) MeV
4.85(36) MeV
AL
La-154161(15) msβ-154Ce
β-, n → 153Ce
100 %
?
10.69(36) MeV
5.31(36) MeV
AL
La-155101(28) msβ-155Ce
β-, n → 154Ce
100 %
?
9.85(50) MeV
6.22(45) MeV
AL
La-15684(78) msβ-156Ce
β-, n → 155Ce
100 %
?
11.77(50) MeV
6.66(50) MeV

 

Notes (related to the columns):

1 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Lanthanum isotope.
6 - Relative atomic mass of the Lanthanum 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.
7 - Nuclear spin I, unit: h/2π.
8 - Nuclear magnetic moment μmag.
9 - 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.
10 - Decay: Half-live of the Lanthanum isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
11 - Decay: 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.
12 - Decay percentage in percent (%).
13 - Decay energy; Particle energy related to decay type.
14 - AE = Excitation energy for metastable nuclei.
15 - 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 Lanthanum nuclides

Nuclide
quantity 1)
spin
Nuclear magnetic
moment
μ/μN
Gyromagnetic
ratio
107 rad T-1 s-1
Quadrupole
moment
Q fm-2
Resonant
frequency
v0 bei 1 T
Relative
sensitivity
H0 = const.
v0 = const. 2)
138La
0,08881(71) %
5+
+3,7084(2)3,5575+ 45,0(20)5,66150,09404
5,3189
139La
99,91119(71) %
7/2+
+2,7791(2)3,801+ 20,6(4)6,06120,06058
2,9895

1) Quantity Percentage of natural occurrence.

2) 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 Lanthanum radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
La-131106 Bq10 Bq/g59.0 min
La-132106 Bq10 Bq/g4.8 h
La-135107 Bq1000 Bq/g19.5 h
La-137107 Bq100 Bq/g6.0 × 104 a
La-138107 Bq0,1 Bq/g1.0 × 1011 a
La-140105 Bq1 Bq/g0,03 TBq1 Bq cm-240.3 h
La-141105 Bq100 Bq/g3.9 h
La-142105 Bq10 Bq/g91.1 min
La-143105 Bq100 Bq/g14.1 min

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

 

Literature Sources and References

Properties of the Lanthanum 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.

Lanthanum: NMR properties - 138La-NMR, 139La-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.

 


Category: Isotopes

Last update: 05.07.2020



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