| Atomic Mass | Mass Excess |
| 138.9089323038 amu | -84.829 MeV |
| Level energy (MeV) | Spin & parity | Half-life | Mode of decay | Branch ratio (%) | Decay energy (MeV) |
| Ground state | 5/2+ | 4.41 H 0.04 | EC | 100 | 2.129 |
There is no gamma-rays or the intensities are so weak!