| Atomic Mass | Mass Excess |
| 136.910681107595 amu | -83.20 MeV |
| Level energy (MeV) | Spin & parity | Half-life | Mode of decay | Branch ratio (%) | Decay energy (MeV) |
| Ground state | 5/2+ | 1.28 H 0.03 | EC | 100 | 2.702 |
| Decay mode | Half-life | Gamma-ray energy (keV) | Intensity (%) |
| EC | 1.28 H 0.02 | 160.32 | 0.97+- 0.21 |
| EC | 1.28 H 0.02 | 353.69 | 0.58+- 0.13 |
| EC | 1.28 H 0.02 | 433.89 | 1.3+- 0.3 |
| EC | 1.28 H 0.02 | 513.98 | 1.08+- 0.23 |
| EC | 1.28 H 0.02 | 836.65 | 1.8+- 0.4 |