| Atomic Mass | Mass Excess |
| 137.911926419075 amu | -82.04 MeV |
| Level energy (MeV) | Spin & parity | Half-life | Mode of decay | Branch ratio (%) | Decay energy (MeV) |
| Ground state | 0+ | 5.04 H 0.09 | EC | 100 | 1.1 |
| Decay mode | Half-life | Gamma-ray energy (keV) | Intensity (%) |
| EC | 5.04 H 0.09 | 199.50 | 0.55+- 0.10 |
| EC | 5.04 H 0.09 | 325.76 | 2.9+- 0.5 |