Isotopes
| Isotope |
Half-life |
Decay mode |
Discovery year |
Reaction |
|---|---|---|---|---|
| 265Mt | 120 !2? min | α ? | unknown | — |
| 266Mt | 0000017 !1.7 ms | α | 1982 | 209Bi(58Fe,n) |
| 267Mt | 000010 !10? ms | α ? | unknown | — |
| 268Mt | 000021 !21 ms | α | 1994 | 272Rg(—,α) |
| 269Mt | 0002 !0.2? s | α ? | unknown | — |
| 270Mt | 0000050 !5.0 ms | α | 2004 | 278Uut(—,2α) |
| 271Mt | 005 !5? s | α ? | unknown | — |
| 272Mt | 010 !10? s | α, SF ? | unknown | — |
| 273Mt | 020 !20? s | α, SF ? | unknown | — |
| 274Mt | 00044 !0.44 s | α, SF | 2006 | 282Uut(—,2α) |
| 275Mt | 0000097 !9.7 ms | α | 2003 | 287Uup(—,3α) |
| 276Mt | 00072 !0.72 s | α, SF | 2003 | 288Uup(—,3α) |
| 277Mt | 060 !1? min | α, SF ? | unknown | — |
| 278Mt | 0076 !7.6 s | α | 2009 | 294Uus(—,4α) |
| 279Mt | 360 !6? min | α, SF ? | unknown | — |
Meitnerium 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. Seven different isotopes of meitnerium have been reported with atomic masses 266, 268, 270, 274–276, and 278, two of which, meitnerium-268 and meitnerium-270, have known but unconfirmed metastable states. Most of these decay predominantly through alpha decay, although some undergo spontaneous fission.
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