| Atomic Mass | Mass Excess |
| 256.108105919053 amu | 100.7 MeV |
| Level energy (MeV) | Spin & parity | Half-life | Mode of decay | Branch ratio (%) | Decay energy (MeV) |
| Ground state | 1.9 S +0.5-0.3 | A | <=90.00 | 9.48 | |
| Ground state | 1.9 S +0.5-0.3 | SF | <=40.00 | 0 | |
| Ground state | 1.9 S +0.5-0.3 | EC | ~35.00 | 6.5 |
There is no gamma-rays or the intensities are so weak!