| Atomic Mass | Mass Excess |
| 258.10187936165 amu | 94.90 MeV |
| Level energy (MeV) | Spin & parity | Half-life | Mode of decay | Branch ratio (%) | Decay energy (MeV) |
| Ground state | 3.9 S 0.4 | A | >95.00 | 8.9 | |
| Ground state | 3.9 S 0.4 | EC | <5.00 | 3.43 | |
| Ground state | 3.9 S 0.4 | SF | <5.00 | 3.38 |
There is no gamma-rays or the intensities are so weak!