Cerium-132m
Properties and data of the isotope 132mCe.
Cerium-132m is an isomeric state of the isotope cerium-132 with an excitation energy of 2341.15 keV, which was first described in 1969 and undergoes an isomeric transition to the ground state.
See also: List of individual Cerium isotopes (and general data sources).
General data
Name of the isotope:Cerium-132m; Ce-132mSymbol:132mCe or 132m58CeMass number A:132 (= number of nucleons)Atomic number Z:58 (= number of protons)Neutrons N:74Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.2758620689655 (= neutron-proton ratio)Neutron excess (N-Z):16Excitation energy:2341.15(21) keVIsotopic mass:131.911464(22) u (atomic weight of Cerium-132m)Nuclide mass:131.8796486 u (calculated nuclear mass without electrons)Mass excess:-82.47075 MeVMass defect:1.18359164 u (per nucleus)Nuclear binding energy:1102.50851111 MeV (per nucleus)
8.35233721 MeV (average binding energy per nucleon)Half-life:9.4(3) msDecay constant λ:73.739061761696 s-1Specific activity α:3.389824555790 × 10+23 Bq g-1
9161687988622.2 Ci g-1Spin and parity:
(nuclear angular momentum)8-Year of discovery:1969
Radioactive Decay
Half-life T½ = 9.4(3) ms respectively 9.4 × 10-3 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| Iso | 132Ce | 100 % | 2.340 MeV | |
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 |
|---|
| 132Ce | | 3.51(11) h | 0+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 74) and isobaric (same nucleon number A = 132) with Cerium-132m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 74 | Isobar A = 132 |
|---|
| 41 | 115Nb | |
| 42 | 116Mo | |
| 43 | 117Tc | |
| 44 | 118Ru | |
| 45 | 119Rh | |
| 46 | 120Pd | |
| 47 | 121Ag | 132Ag |
| 48 | 122Cd | 132Cd |
| 49 | 123In | 132In |
| 50 | 124Sn | 132Sn |
| 51 | 125Sb | 132Sb |
| 52 | 126Te | 132Te |
| 53 | 127I | 132I |
| 54 | 128Xe | 132Xe |
| 55 | 129Cs | 132Cs |
| 56 | 130Ba | 132Ba |
| 57 | 131La | 132La |
| 58 | 132Ce | 132Ce |
| 59 | 133Pr | 132Pr |
| 60 | 134Nd | 132Nd |
| 61 | 135Pm | 132Pm |
| 62 | 136Sm | 132Sm |
| 63 | 137Eu | 132Eu |
| 64 | 138Gd | |
| 65 | 139Tb | |
| 66 | 140Dy | |
| 67 | 141Ho | |
External data and identifiers
Last update: 2025-10-28
Perma link: https://www.chemlin.org/isotope/cerium-132m
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