Gadolinium-173 is a radioisotope of the chemical element gadolinium, which has 109 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 173. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of 173Gd is exclusively for academic purposes.
The discovery of the extremely neutron-rich isotope gadolinium-173 was reported for the first time in January 2026. It was produced via in-flight projectile fragmentation of a high-energy uranium-238 beam - with an energy of 345 MeV per nucleon - impinging on a beryllium target at the RIKEN RI Beam Factory, with subsequent detection achieved using the BigRIPS separator. Neither mass nor other physical parameters were measured in the experiment [1].
See also: List of individual Gadolinium isotopes (and general data sources).
| Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
|---|---|---|---|---|
| β- ? |
| Z | Isotone N = 109 | Isobar A = 173 |
|---|---|---|
| 64 | 173Gd | 173Gd |
| 65 | 174Tb | 173Tb |
| 68 | 177Er | 173Er |
| 69 | 178Tm | 173Tm |
| 70 | 179Yb | 173Yb |
| 71 | 180Lu | 173Lu |
| 72 | 181Hf | 173Hf |
| 73 | 182Ta | 173Ta |
| 74 | 183W | 173W |
| 75 | 184Re | 173Re |
| 76 | 185Os | 173Os |
| 77 | 186Ir | 173Ir |
| 78 | 187Pt | 173Pt |
| 79 | 188Au | 173Au |
| 80 | 189Hg | 173Hg |
| 81 | 190Tl | |
| 82 | 191Pb | |
| 83 | 192Bi | |
| 84 | 193Po | |
| 85 | 194At | |
| 86 | 195Rn |
[1] - Toshiyuki Sumikama, Naoki Fukuda, Toshiyuki Kubo et al.:
Expanding the Isotopic Frontier: Seven New Neutron-Rich Rare-Earth Isotopes Observed at RIKEN RI Beam Factory.
In: Journal of the Physical Society of Japan, 95, 2, (2026), DOI 10.7566/JPSJ.95.024202.
Last update:
Perma link: https://www.chemlin.org/isotope/gadolinium-173
© 1996 - 2026 ChemLin