Gadolinium-133 is a radioisotope of the chemical element gadolinium, which has 69 neutrons in its atomic nucleus in addition to the element-specific 64 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 133. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of 133Gd is exclusively for academic purposes.
The proton-rich isotope Gd-133 was discovered and identified - according to a report from 2026 - during the irradiation of a 1 mm thick Be target with uranium-238 particles (345 MeV/nucleon) [1].
See also: List of individual Gadolinium isotopes (and general data sources).
Half-life T½ = > 310 ns respectively 3.1 × 10-7 seconds s.
| Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
|---|---|---|---|---|
| EC, β+ ? | 133Eu | |||
| β+, p ? | 132Sm |
| Z | Isotone N = 69 | Isobar A = 133 |
|---|---|---|
| 38 | 107Sr | |
| 39 | 108Y | |
| 40 | 109Zr | |
| 41 | 110Nb | |
| 42 | 111Mo | |
| 43 | 112Tc | |
| 44 | 113Ru | |
| 45 | 114Rh | |
| 46 | 115Pd | |
| 47 | 116Ag | |
| 48 | 117Cd | 133Cd |
| 49 | 118In | 133In |
| 50 | 119Sn | 133Sn |
| 51 | 120Sb | 133Sb |
| 52 | 121Te | 133Te |
| 53 | 122I | 133I |
| 54 | 123Xe | 133Xe |
| 55 | 124Cs | 133Cs |
| 56 | 125Ba | 133Ba |
| 57 | 126La | 133La |
| 58 | 127Ce | 133Ce |
| 59 | 128Pr | 133Pr |
| 60 | 129Nd | 133Nd |
| 61 | 130Pm | 133Pm |
| 62 | 131Sm | 133Sm |
| 63 | 132Eu | 133Eu |
| 64 | 133Gd | 133Gd |
[1] - H. Suzuki, N. Fukuda, H. Takeda et al.:
Discovery of Proton-Rich Radioactive Isotopes in the Z = 63-70 Region Produced by the Projectile Fragmentation of a 345-MeV/Nucleon 238U Beam.
In: Progress of Theoretical and Experimental Physics. 2. 023D02, (2026), DOI 10.1093/ptep/ptaf190.
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