| Atomic Mass | Mass Excess |
| 138.908835684806 amu | -84.919 MeV |
| Level energy (MeV) | Spin & parity | Half-life | Mode of decay | Branch ratio (%) | Decay energy (MeV) |
| Ground state | 7/2- | 83.06 M 0.28 | B- | 100 | 2.317 |
| Decay mode | Half-life | Gamma-ray energy (keV) | Intensity (%) |
| B- | 83.06 M 0.28 | 165.864 | 24.+- 4. |