Lanthanum-132
Properties and data of the isotope 132La.
See also: List of individual Lanthanum isotopes (and general data sources).
General data
Name of the isotope:Lanthanum-132; La-132Symbol:132La or 13257LaMass number A:132 (= number of nucleons)Atomic number Z:57 (= number of protons)Neutrons N:75Isotopic mass:131.91012(4) u (atomic weight of Lanthanum-132)Nuclide mass:131.8788531 u (calculated nuclear mass without electrons)Mass excess:-83.72268 MeVMass defect:1.185775524 u (per nucleus)Nuclear binding energy:1104.54278595 MeV (per nucleus)
8.36774838 MeV (average binding energy per nucleon)Separation energy:SN = 8.03(5) MeV (first neutron)
SP = 4.33(4) MeV (first proton)Half-life:4.8(2) hDecay constant λ:4.011268406018 × 10-5 s-1Specific activity α:1.84400178382 × 10+17 Bq g-1
4983788.6049216 Ci g-1Spin and parity:
(nuclear angular momentum)2-Year of discovery:1951
Radioactive Decay
Half-life T½ = 4.8(2) h (hours) respectively 1.7280 × 104 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 132Ba | 100 % | 4.71(4) MeV | |
Parent Nuclides
Direct parent isotope is: 132Ce.
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
| Nuclear Isomer | Excitation Energy | Half-life | Spin |
|---|
| 132mLa | 188.20(11) keV | 24.3(5) min | 6- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 75) and isobaric (same nucleon number A = 132) with Lanthanum-132. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 75 | Isobar A = 132 |
|---|
| 42 | 117Mo | |
| 43 | 118Tc | |
| 44 | 119Ru | |
| 45 | 120Rh | |
| 46 | 121Pd | |
| 47 | 122Ag | 132Ag |
| 48 | 123Cd | 132Cd |
| 49 | 124In | 132In |
| 50 | 125Sn | 132Sn |
| 51 | 126Sb | 132Sb |
| 52 | 127Te | 132Te |
| 53 | 128I | 132I |
| 54 | 129Xe | 132Xe |
| 55 | 130Cs | 132Cs |
| 56 | 131Ba | 132Ba |
| 57 | 132La | 132La |
| 58 | 133Ce | 132Ce |
| 59 | 134Pr | 132Pr |
| 60 | 135Nd | 132Nd |
| 61 | 136Pm | 132Pm |
| 62 | 137Sm | 132Sm |
| 63 | 138Eu | 132Eu |
| 64 | 139Gd | |
| 65 | 140Tb | |
| 66 | 141Dy | |
| 67 | 142Ho | |
| 68 | 143Er | |
| 69 | 144Tm | |
External data and identifiers
Last update: 2020-10-19
Perma link: https://www.chemlin.org/isotope/lanthanum-132
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