| Atomic Mass | Mass Excess |
| 256.091766573591 amu | 85.480 MeV |
| Level energy (MeV) | Spin & parity | Half-life | Mode of decay | Branch ratio (%) | Decay energy (MeV) |
| Ground state | 0+ | 157.6 M 1.3 | SF | 91.9 | 0 |
| Ground state | 0+ | 157.6 M 1.3 | A | 8.1 | 7.027 |
There is no gamma-rays or the intensities are so weak!