| Atomic Mass | Mass Excess |
| 137.907107278354 amu | -86.529 MeV |
| Level energy (MeV) | Spin & parity | Half-life | Mode of decay | Branch ratio (%) | Decay energy (MeV) |
| Ground state | 5+ | 1.05E+11 Y 0.02 | EC | 66.4 | 1.738 |
| Ground state | 5+ | 1.05E+11 Y 0.02 | B- | 33.6 | 1.044 |
| Decay mode | Half-life | Gamma-ray energy (keV) | Intensity (%) |
| B- | 1.05E+11 Y 0.03 | 788.742 | 33.6+- 0.5 |
| EC | 1.05E+11 Y 0.03 | 1435.795 | 66.4+- 0.5 |