| Atomic Mass | Mass Excess |
| 166.962565507474 amu | -34.87 MeV |
| Level energy (MeV) | Spin & parity | Half-life | Mode of decay | Branch ratio (%) | Decay energy (MeV) |
| Ground state | (9/2-) | 5.9 S 0.3 | EC | ~99.00 | 0 |
| Ground state | (9/2-) | 5.9 S 0.3 | A | ~1.00 | 5.257 |
| Ground state | 3.4 S 0.4 | A | 100 | 5.257 |
There is no gamma-rays or the intensities are so weak!