| Atomic Mass | Mass Excess |
| 139.909070791025 amu | -84.700 MeV |
| Level energy (MeV) | Spin & parity | Half-life | Mode of decay | Branch ratio (%) | Decay energy (MeV) |
| Ground state | 1+ | 3.39 M 0.01 | EC | 100 | 3.388 |
| Decay mode | Half-life | Gamma-ray energy (keV) | Intensity (%) |
| EC | 3.39 M 0.01 | 1596.10 | 0.50+- 0.04 |