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Isotopes of the Element Lanthanum

[Click for Main Data]         Proton Emission     Neutron Emission     Electron Emission     Positron Emission

Most of the isotope data on this site has been obtained from the National Nuclear Data Center.

Naturally Occurring Isotopes

Mass NumberNatural AbundanceHalf-life
1380.08881%1.02×10+11 years
13999.9119%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
11723.5 millisecondsProton Emission93.90%
Electron Capture6.10%
117m10 millisecondsProton Emission97.40%
Electron Capture2.60%
118No Data AvailableElectron Capture (suspected)No Data Available
119No Data AvailableElectron Capture (suspected)No Data Available
1202.8 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
> 0.00%
1215.3 secondsElectron Capture100.00%
1228.6 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
No Data Available
12317 secondsElectron Capture100.00%
12429.21 secondsElectron Capture100.00%
124m21 secondsElectron Capture100.00%
12564.8 secondsElectron Capture100.00%
125m0.39 secondsNo Data AvailableNo Data Available
12654 secondsElectron Capture> 0.00%
126m< 50 secondsElectron CaptureNo Data Available
Isomeric TransitionNo Data Available
1275.1 minutesElectron Capture100.00%
127m3.7 minutesElectron Capture100.00%
Isomeric TransitionNo Data Available
1285.18 minutesElectron Capture100.00%
128m< 1.4 minutesElectron Capture100.00%
12911.6 minutesElectron Capture100.00%
129m0.56 secondsIsomeric Transition100.00%
1308.7 minutesElectron Capture100.00%
13159 minutesElectron Capture100.00%
1324.8 hoursElectron Capture100.00%
132m24.3 minutesIsomeric Transition76.00%
Electron Capture24.00%
1333.912 hoursElectron Capture100.00%
1346.45 minutesElectron Capture100.00%
13519.5 hoursElectron Capture100.00%
1369.87 minutesElectron Capture100.00%
136m114 millisecondsIsomeric Transition100.00%
1376×10+4 yearsElectron Capture100.00%
1381.02×10+11 yearsElectron Capture65.60%
Beta-minus Decay34.40%
139STABLE--
1401.67855 daysBeta-minus Decay100.00%
1413.92 hoursBeta-minus Decay100.00%
14291.1 minutesBeta-minus Decay100.00%
14314.2 minutesBeta-minus Decay100.00%
14440.8 secondsBeta-minus Decay100.00%
14524.8 secondsBeta-minus Decay100.00%
1466.27 secondsBeta-minus Decay100.00%
146m10.0 secondsBeta-minus Decay100.00%
1474.06 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
0.04%
1481.26 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
0.15%
1491.05 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
1.43%
1500.86 secondsBeta-minus Decay with
delayed Neutron Emission
2.70%
Beta-minus Decay100.00%
151> 300 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
152> 150 nanoseconds   Beta-minus Decay100.00%
153> 100 nanosecondsBeta-minus Decay (suspected)No Data Available
154No Data AvailableBeta-minus Decay (suspected)No Data Available
155No Data AvailableBeta-minus Decay (suspected)   No Data Available