| Nuclide | weight or level energy | spin & parity | decay mode | half-life | abundance |
| MT-266 | 266.137950452813amu | A | 0.8 MS 0.2 | ||
| MT-266 | 266.137950452813amu | SF | 0.8 MS 0.2 | ||
| MT-266m | .43MeV | A | 3.8 MS 0.8 | ||
| MT-267 | 267.137521035062amu | ||||
| MT-268 | 268.138809288317amu | (5+,6+) | A | 0.07 S +0.10-0.03 |