| Atomic Mass | Mass Excess |
| 136.907083660378 amu | -86.551 MeV |
| Level energy (MeV) | Spin & parity | Half-life | Mode of decay | Branch ratio (%) | Decay energy (MeV) |
| Ground state | 7/2+ | 30.07 Y 0.03 | B- | 100 | 1.176 |
| Decay mode | Half-life | Gamma-ray energy (keV) | Intensity (%) |
| B- | 30.07 Y 0.03 | 661.657 | 85.10+- 0.20 |