Isotopes
| Isotope |
Half-life |
Decay mode |
Discovery year |
Reaction |
|---|---|---|---|---|
| 263Hs | 000000074 !0.74 ms | α, SF | 2008 | 208Pb(56Fe,n) |
| 264Hs | 000000080 !~0.8 ms | α, SF | 1986 | 207Pb(58Fe,n) |
| 265Hs | 00000019 !1.9 ms | α, SF | 1984 | 208Pb(58Fe,n) |
| 265mHs | 00000003 !0.3 ms | α | 1984 | 208Pb(58Fe,n) |
| 266Hs | 00000023 !2.3 ms | α, SF | 2000 | 270Ds(—,α) |
| 267Hs | 0000052 !52 ms | α, SF | 1995 | 238U(34S,5n) |
| 267mHs | 00008 !0.8 s | α | 1995 | 238U(34S,5n) |
| 268Hs | 00004 !0.4 s | α | 2009 | 238U(34S,4n) |
| 269Hs | 00036 !3.6 s | α | 1996 | 277Cn(—,2α) |
| 269mHs | 00097 !9.7 s | α | 2004 | 248Cm(26Mg,5n) |
| 270Hs | 00036 !3.6 s | α | 2004 | 248Cm(26Mg,4n) |
| 271Hs | 0004 !~4 s | α | 2004 | 248Cm(26Mg,3n) |
| 272Hs | 0040 !40? s | α, SF ? | unknown | — |
| 273Hs | 000024 !0.24 s | α | 2004 | 285Fl(—,3α) |
| 274Hs | 0060 !1? min | α, SF ? | unknown | — |
| 275Hs | 000015 !0.15 s | α | 2003 | 287Fl(—,3α) |
| 276Hs | 3600 !1? h | α, SF ? | unknown | — |
| 277Hs | 0002 !2 s | α | 2009 | 289Fl(—,3α) |
| 277mHs ? | 0660 !~11 min ? | α | 1999 | 289Fl(—,3α) |
Hassium has no stable or naturally-occurring isotopes. Several radioactive isotopes have been synthesized in the laboratory, either by fusing two atoms or by observing the decay of heavier elements. Twelve different isotopes have been reported with atomic masses from 263 to 277 (with the exceptions of 272, 274, and 276), four of which, hassium-265, hassium-267, hassium-269, and hassium-277, have known metastable states (although that of hassium-277 is unconfirmed). Most of these decay predominantly through alpha decay, but some also undergo spontaneous fission.
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