Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.
All Known Isotopes of the Element Hassium
| Mass Number | | Half-life | | Decay Mode | | Branching Percentage | | | 263 | | No Data Available | | Alpha Decay | | <= 100.00 | | | 264 | | ≈ 0.8 milliseconds | | Alpha Decay | | ~ 50.00 | | | | | | Spontaneous Fission | | ~ 50.00 | | | 265 | | 2.0 milliseconds | | Alpha Decay | | ~ 100.00 | | | | | | Spontaneous Fission | | <= 1.00 | | | 266 | | 2.3 milliseconds | | Alpha Decay | | <= 100.00 | | | 267 | | 26 milliseconds | | Alpha Decay | | 100.00 | | | 269 | | 9 seconds | | Alpha Decay | | ~ 100.00 | | | 273 | | 1.2 seconds | | Alpha Decay | | 100.00 | | | | | | Spontaneous Fission | | No Data Available | | | 275 | | 0.19 seconds | | Alpha Decay | | 100.00 | | | 277 | | 12 minutes | | Spontaneous Fission | | No Data Available | | | | | | Alpha Decay | | No Data Available | |
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