View source for Physics:Isotopes of meitnerium

{{Short description|Nuclides with atomic number of 109 but with different mass numbers}}
[[Chemistry:Meitnerium|Meitnerium]] (<sub>109</sub>Mt) is a [[Physics:Synthetic element|synthetic element]], and thus a [[Physics:Standard atomic weight|standard atomic weight]] cannot be given. Like all synthetic elements, it has no [[Physics:Stable isotope|stable isotope]]s. The first [[Physics:Isotope|isotope]] to be synthesized was <sup>266</sup>Mt in 1982, and this is also the only isotope directly synthesized; all other isotopes are only known as [[Physics:Decay product|decay product]]s of heavier [[Chemistry:Chemical element|element]]s. There are eight known isotopes, from <sup>266</sup>Mt to <sup>278</sup>Mt. There may also be two [[Physics:Nuclear isomer|isomers]]. The longest-lived of the known isotopes is <sup>278</sup>Mt with a [[Physics:Half-life|half-life]] of 8 seconds. The unconfirmed heavier <sup>282</sup>Mt appears to have an even longer half-life of 67 seconds.

== List of isotopes ==
{{Isotopes table
|symbol=Mt
|refs=NUBASE2020
|notes=m, unc(), mass#, spin(), spin#
}}
|-
| <sup>266</sup>Mt
| style="text-align:right" | 109
| style="text-align:right" | 157
| 266.137060(100)
| {{val|2.0|(5)|u=ms}}
| [[Physics:Alpha decay|α]]
| <sup>262</sup>Bh
|
|-
| <sup>268</sup>Mt<ref group="n">Not directly synthesized, occurs as [[Physics:Decay product|decay product]] of <sup>272</sup>Rg</ref>
| style="text-align:right" | 109
| style="text-align:right" | 159
| 268.13865(25)#
| {{val|23|(7)|u=ms}}
| α
| <sup>264</sup>Bh
| 5+#, 6+#
|-
| style="text-indent:1em" | <sup>268m</sup>Mt<ref group="n" name="ui">This isomer is unconfirmed</ref>
| colspan="3" style="text-indent:2em" | 0+X&nbsp;keV
| {{val|70|100|30|u=ms}}
| α
| <sup>264</sup>Bh
|
|-
| <sup>270</sup>Mt<ref group="n">Not directly synthesized, occurs in [[Physics:Decay chain|decay chain]] of <sup>278</sup>Nh</ref>
| style="text-align:right" | 109
| style="text-align:right" | 161
| 270.14033(18)#
| {{val|800|(400)|u=ms}}
| α
| <sup>266</sup>Bh
|
|-
| style="text-indent:1em" | <sup>270m</sup>Mt<ref group="n" name="ui" />
| colspan="3" style="text-indent:2em" |
| 1.1 s?
| α
| <sup>266</sup>Bh
|
|-
| <sup>274</sup>Mt<ref group="n">Not directly synthesized, occurs in decay chain of <sup>282</sup>Nh</ref>
| style="text-align:right" | 109
| style="text-align:right" | 165
| 274.14725(38)#<ref name=Mc2022/>
| {{val|640|760|230|u=ms}}<ref name=Mc2022>{{Cite journal |title=New isotope <sup>286</sup>Mc produced in the <sup>243</sup>Am+<sup>48</sup>Ca reaction |last1=Oganessian |first1=Yu. Ts. |last2=Utyonkov |first2=V. K. |last3=Kovrizhnykh |first3=N. D. |display-authors=et al. |date=2022 |journal=Physical Review C |volume=106 |number=64306 |page=064306 |doi=10.1103/PhysRevC.106.064306|bibcode=2022PhRvC.106f4306O |s2cid=254435744 |doi-access=free }}</ref>
| α
| <sup>270</sup>Bh
|
|-
| <sup>275</sup>Mt<ref group="n">Not directly synthesized, occurs in decay chain of <sup>287</sup>Mc</ref>
| style="text-align:right" | 109
| style="text-align:right" | 166
| 275.14882(50)#
| {{val|20|13|6|u=ms}}<ref name=Mc2022/>
| α
| <sup>271</sup>Bh
|
|-
| <sup>276</sup>Mt<ref group="n">Not directly synthesized, occurs in decay chain of <sup>288</sup>Mc</ref>
| style="text-align:right" | 109
| style="text-align:right" | 167
| 276.15159(59)#
| {{val|620|60|40|u=ms}}<ref name=Mc2022/>
| α
| <sup>272</sup>Bh
|
|-
| <sup>277</sup>Mt<ref group="n">Not directly synthesized, occurs in decay chain of <sup>293</sup>Ts</ref>
| style="text-align:right" | 109
| style="text-align:right" | 168
| 277.15327(82)#
| {{val|5|9|2|u=ms}}<ref name="E117-Oganessian"/>
| [[Physics:Spontaneous fission|SF]]
| (various)
| 
|-
| <sup>278</sup>Mt<ref group="n">Not directly synthesized, occurs in decay chain of <sup>294</sup>Ts</ref>
| style="text-align:right" | 109
| style="text-align:right" | 169
| 278.15631(68)#
| {{val|6|(3)|u=s}}
| α
| <sup>274</sup>Bh
|
|-
| <sup>282</sup>Mt<ref group="n">Not directly synthesized, occurs in decay chain of <sup>290</sup>Fl and <sup>294</sup>Lv; unconfirmed</ref>
| style="text-align:right"| 109
| style="text-align:right"| 173
|
| 67&nbsp;s?
| α
| <sup>278</sup>Bh
|
{{Isotopes table/footer}}

==Isotopes and nuclear properties==

===Nucleosynthesis===
Super-heavy elements such as meitnerium are produced by bombarding lighter elements in [[Physics:Particle accelerator|particle accelerator]]s that induce fusion reactions. Whereas the lightest isotope of meitnerium, meitnerium-266, can be synthesized directly this way, all the heavier meitnerium isotopes have only been observed as decay products of elements with higher [[Physics:Atomic number|atomic number]]s.<ref name="AM89">{{Cite journal |first1=Peter |last1=Armbruster |name-list-style=amp|first2=Gottfried|last2=Munzenberg |title=Creating superheavy elements |journal=Scientific American |volume=34 |pages=36–42 |year=1989}}</ref>

Depending on the energies involved, the former are separated into "hot" and "cold". In hot fusion reactions, very light, high-energy projectiles are accelerated toward very heavy targets ([[Chemistry:Actinide|actinide]]s), giving rise to compound nuclei at high excitation energy (~40–50&nbsp;[[Physics:Electronvolt|MeV]]) that may either fission or evaporate several (3 to 5) neutrons.<ref name="fusion">{{cite journal |last1=Barber |first1=Robert C. |last2=Gäggeler |first2=Heinz W. |last3=Karol |first3=Paul J. |last4=Nakahara |first4=Hiromichi |last5=Vardaci |first5=Emanuele |last6=Vogt |first6=Erich |title=Discovery of the element with atomic number 112 (IUPAC Technical Report) |journal=Pure and Applied Chemistry |volume=81 |issue=7 |page=1331 |year=2009 |doi=10.1351/PAC-REP-08-03-05|doi-access=free }}</ref> In cold fusion reactions, the produced fused nuclei have a relatively low excitation energy (~10–20&nbsp;MeV), which decreases the probability that these products will undergo fission reactions. As the fused nuclei cool to the [[Physics:Ground state|ground state]], they require emission of only one or two neutrons, and thus, allows for the generation of more neutron-rich products.<ref name="AM89" /> Nevertheless, the products of hot fusion tend to still have more neutrons overall. The latter is a distinct concept from that of where nuclear fusion claimed to be achieved at room temperature conditions (see [[Physics:Cold fusion|cold fusion]]).<ref>{{cite journal |last1=Fleischmann |first1=Martin |last2=Pons |first2=Stanley |year=1989 |title=Electrochemically induced nuclear fusion of deuterium |journal=Journal of Electroanalytical Chemistry and Interfacial Electrochemistry |volume=261 |issue=2 |pages=301–308 |doi=10.1016/0022-0728(89)80006-3 }}</ref>

The table below contains various combinations of targets and projectiles which could be used to form compound nuclei with ''Z''&nbsp;=&nbsp;109.

{|class="wikitable" style="text-align:center"
! Target !! Projectile !! CN !! Attempt result
|-
!<sup>208</sup>Pb
|<sup>59</sup>Co||<sup>267</sup>Mt||{{Yes|Successful reaction}}
|-
!<sup>209</sup>Bi
|<sup>58</sup>Fe||<sup>267</sup>Mt||{{Yes|Successful reaction}}
|-
!<sup>227</sup>Ac
|<sup>48</sup>Ca||<sup>275</sup>Mt||{{unk|Reaction yet to be attempted}}
|-
!<sup>238</sup>U
|<sup>37</sup>Cl||<sup>275</sup>Mt||{{No|Failure to date}}
|-
!<sup>244</sup>Pu
|<sup>31</sup>P||<sup>275</sup>Mt||{{unk|Reaction yet to be attempted}}
|-
!<sup>248</sup>Cm
|<sup>27</sup>Al||<sup>275</sup>Mt||{{unk|Reaction yet to be attempted}}
|-
!<sup>250</sup>Cm
|<sup>27</sup>Al||<sup>277</sup>Mt||{{unk|Reaction yet to be attempted}}
|-
!<sup>249</sup>Bk
|<sup>26</sup>Mg||<sup>275</sup>Mt||{{unk|Reaction yet to be attempted}}
|-
!<sup>254</sup>Es
|<sup>22</sup>Ne||<sup>276</sup>Mt||{{No|Failure to date}}
|}

====Cold fusion====
After the first successful synthesis of meitnerium in 1982 by the GSI team,<ref name="82Mu01">
{{Cite journal
 |last1=Münzenberg |first1=G.
 |year=1982
 |title=Observation of one correlated α-decay in the reaction <sup>58</sup>Fe on <sup>209</sup>Bi→<sup>267</sup>109
 |journal=[[Physics:Zeitschrift für Physik A|Zeitschrift für Physik A]]
 |volume=309 |issue=1 |pages=89–90
 |bibcode=1982ZPhyA.309...89M
 |doi=10.1007/BF01420157
|s2cid=120062541
 |display-authors=0}}</ref> a team at the [[Organization:Joint Institute for Nuclear Research|Joint Institute for Nuclear Research]] in [[Organization:Dubna|Dubna]], Russia, also tried to observe the new element by bombarding bismuth-209 with iron-58. In 1985 they managed to identity alpha decays from the descendant isotope <sup>246</sup>[[Chemistry:Californium|Cf]] indicating the formation of meitnerium. The observation of a further two atoms of <sup>266</sup>Mt from the same reaction was reported in 1988 and of another 12 in 1997 by the German team at GSI.<ref>{{Cite journal|last1=Münzenberg|first1=G.|last2=Hofmann|first2=S.|last3=Heßberger|first3=F. P.|last4=Folger|first4=H.|last5=Ninov|first5=V.|last6=Poppensieker|first6=K.|title=New results on element 109|year=1988|journal=Zeitschrift für Physik A |volume=330|issue=4|pages=435–436|doi=10.1007/BF01290131|bibcode=1988ZPhyA.330..435M|display-authors=3|last7=Quint|first7=A. B.|last8=Reisdorf|first8=W.|last9=Schött|first9=H. -J.|s2cid=121364541}}</ref><ref>{{Cite journal |last1=Hofmann |first1=S. |last2=Heßberger |first2=F. P. |last3=Ninov |first3=V. |last4=Armbruster |first4=P. |last5=Münzenberg |first5=G. |last6=Stodel |first6=C. |last7=Popeko |first7=A. G. |last8=Yeremin |first8=A. V. |last9=Saro |first9=S.|title=Excitation function for the production of <sup>265</sup>108 and <sup>266</sup>109 |year=1997 |journal=Zeitschrift für Physik A |volume=358 |issue=4 |pages=377–378 |doi=10.1007/s002180050343 |bibcode=1997ZPhyA.358..377H |s2cid=124304673 |display-authors=3}}</ref>

The same meitnerium isotope was also observed by the Russian team at Dubna in 1985 from the reaction:
:{{nuclide|lead|208}} + {{nuclide|cobalt|59}} → {{nuclide|meitnerium|266}} + {{SubatomicParticle|neutron}}
by detecting the alpha decay of the descendant <sup>246</sup>Cf nuclei. In 2007, an American team at the [[Organization:Lawrence Berkeley National Laboratory|Lawrence Berkeley National Laboratory]] (LBNL) confirmed the decay chain of the <sup>266</sup>Mt isotope from this reaction.<ref>{{Cite journal |last1=Nelson |first1=S. L. |last2=Gregorich |first2=K. E. |last3=Dragojević |first3=I. |last4=Dvořák |first4=J. |last5=Ellison |first5=P. A. |last6=Garcia |first6=M. A. |title=Comparison of complementary reactions in the production of Mt |journal=Physical Review C |volume=79 |issue=2 |page=027605 |doi=10.1103/PhysRevC.79.027605 |bibcode=2009PhRvC..79b7605N |display-authors=3 |year=2009 |last7=Gates |first7=J. |last8=Stavsetra |first8=L. |last9=Ali |first9=M.|s2cid=73657127 |url=https://zenodo.org/record/1233777 }}</ref>

====Hot fusion====
In 2002–2003, the team at LBNL attempted to generate the isotope <sup>271</sup>Mt to study its chemical properties by bombarding [[Physics:Uranium-238|uranium-238]] with [[Chemistry:Chlorine|chlorine]]-37, but without success.<ref name="GSI2003">Zielinski P. M. et al. (2003). [http://www.gsi.de/informationen/wti/library/scientificreport2003/files/2.pdf "The search for <sup>271</sup>Mt via the reaction <sup>238</sup>U + <sup>37</sup>Cl"] {{webarchive|url=https://web.archive.org/web/20120206214022/http://www.gsi.de/informationen/wti/library/scientificreport2003/files/2.pdf |date=2012-02-06 }}, ''GSI Annual report''. Retrieved on 2008-03-01</ref> Another possible reaction that would form this isotope would be the fusion of [[Chemistry:Berkelium|berkelium]]-249 with [[Chemistry:Magnesium|magnesium]]-26; however, the yield for this reaction is expected to be very low due to the high radioactivity of the berkelium-249 target.<ref name="Haire">{{cite book| title = The Chemistry of the Actinide and Transactinide Elements| editor1-last = Morss|editor2-first = Norman M.| editor2-last = Edelstein| editor3-last = Fuger|editor3-first = Jean| last = Haire|first = Richard G.| chapter = Transactinides and the future elements| publisher = [[Company:Springer Science+Business Media|Springer Science+Business Media]]| year = 2006| isbn = 1-4020-3555-1| location = Dordrecht, The Netherlands| edition = 3rd}}</ref> Other potentially longer-lived isotopes were unsuccessfully targeted by a team at [[Organization:Lawrence Livermore National Laboratory|Lawrence Livermore National Laboratory]] (LLNL) in 1988 by bombarding [[Chemistry:Einsteinium|einsteinium]]-254 with [[Chemistry:Neon|neon]]-22.<ref name="GSI2003" />

====Decay products====
<div style="float:right; margin:1em; font-size:85%;">
{|class="wikitable" style="text-align:center"
|+List of meitnerium isotopes observed by decay
! Evaporation residue !! Observed meitnerium isotope
|-
|<sup>294</sup>Lv, <sup>290</sup>Fl, <sup>290</sup>Nh, <sup>286</sup>Rg ?||<sup>282</sup>Mt ?
|-
|<sup>294</sup>Ts, <sup>290</sup>Mc, <sup>286</sup>Nh, <sup>282</sup>Rg||<sup>278</sup>Mt<ref name="e117">
{{cite journal
 |last1=Oganessian |first1=Yu. Ts.
 |year=2010
 |title=Synthesis of a New Element with Atomic Number ''Z'' = 117
 |journal=[[Physics:Physical Review Letters|Physical Review Letters]]
 |volume=104 |issue=14 |pages=142502
 |bibcode=2010PhRvL.104n2502O
 |doi=10.1103/PhysRevLett.104.142502
 |pmid=20481935
|display-authors=0|doi-access=free
 }}</ref>
|-
|<sup>293</sup>Ts, <sup>289</sup>Mc, <sup>285</sup>Nh, <sup>281</sup>Rg||<sup>277</sup>Mt<ref name="E117-Oganessian">{{cite journal
 |last1=Oganessian |first1=Yu. Ts.
 |year=2013
 |title=Experimental studies of the <sup>249</sup>Bk + <sup>48</sup>Ca reaction including decay properties and excitation function for isotopes of element 117, and discovery of the new isotope <sup>277</sup>Mt
 |journal=[[Physics:Physical Review C|Physical Review C]]
 |volume=87 |issue=5 |pages=054621
 |bibcode=2013PhRvC..87e4621O
 |doi=10.1103/PhysRevC.87.054621
|display-authors=0|doi-access=free
 }}</ref>
|-
|<sup>288</sup>Mc, <sup>284</sup>Nh, <sup>280</sup>Rg||<sup>276</sup>Mt<ref name="Organessian">{{cite book|doi=10.1063/1.2746600|chapter=Heaviest Nuclei Produced in <sup>48</sup>Ca-induced Reactions (Synthesis and Decay Properties)|title=AIP Conference Proceedings|year=2007|last1=Oganessian|first1=Yu. Ts.|last2=Penionzhkevich|first2=Yu. E.|last3=Cherepanov|first3=E. A.|volume=912|pages=235–246}}</ref>
|-
|<sup>287</sup>Mc, <sup>283</sup>Nh, <sup>279</sup>Rg||<sup>275</sup>Mt<ref name="Organessian" />
|-
|<sup>286</sup>Mc, <sup>282</sup>Nh, <sup>278</sup>Rg||<sup>274</sup>Mt<ref name="Organessian" />
|-
|<sup>278</sup>Nh, <sup>274</sup>Rg||<sup>270</sup>Mt<ref name="04Mo01">{{cite journal|title=Experiment on the Synthesis of Element 113 in the Reaction <sup>209</sup>Bi(<sup>70</sup>Zn,n)<sup>278</sup>113|year=2004|journal=Journal of the Physical Society of Japan|volume=73|issue=10|pages=2593–2596|doi=10.1143/JPSJ.73.2593|bibcode=2004JPSJ...73.2593M|last1=Morita|first1=Kosuke|last2=Morimoto|first2=Kouji|last3=Kaji|first3=Daiya|last4=Akiyama|first4=Takahiro|last5=Goto|first5=Sin-ichi|last6=Haba|first6=Hiromitsu|first7=Eiji |last7=Ideguchi|first8=Rituparna |last8=Kanungo|first9=Kenji |last9=Katori|first10=Hiroyuki |last10=Koura|first11=Hisaaki |last11=Kudo|first12=Tetsuya |last12=Ohnishi|first13=Akira |last13=Ozawa|first14=Toshimi |last14=Suda|first15=Keisuke |last15=Sueki|first16=HuShan |last16=Xu|first17=Takayuki |last17=Yamaguchi|first18=Akira |last18=Yoneda|first19=Atsushi |last19=Yoshida|first20=YuLiang |last20=Zhao|doi-access=free}}</ref>
|-
|<sup>272</sup>Rg||<sup>268</sup>Mt<ref name="95Ho01">{{cite journal|doi=10.1007/BF01291182 |title=The new element 111 |year=1995 |last1=Hofmann |first1=S. |journal=Zeitschrift für Physik A |volume=350 |pages=281–282 |last2=Ninov |first2=V. |last3=Heßberger |first3=F. P. |last4=Armbruster |first4=P. |last5=Folger |first5=H. |last6=Münzenberg |first6=G. |last7=Schött |first7=H. J. |last8=Popeko |first8=A. G. |last9=Yeremin |first9=A. V. |first10=A. N. |last10=Andreyev |first11=S. |last11=Saro |first12=R. |last12=Janik |first13=M. |last13=Leino |bibcode=1995ZPhyA.350..281H |issue=4 |s2cid=18804192 |url=http://wwwsusi4.gsi.de/forschung/kp/kp2/ship/111publication.pdf |archive-url=https://web.archive.org/web/20140116120246/http://wwwsusi4.gsi.de/forschung/kp/kp2/ship/111publication.pdf |url-status=dead |archive-date=2014-01-16 }}</ref>
|}
</div>
All the isotopes of meitnerium except meitnerium-266 have been detected only in the decay chains of elements with a higher [[Physics:Atomic number|atomic number]], such as [[Chemistry:Roentgenium|roentgenium]]. Roentgenium currently has eight known isotopes; all but one of them undergo alpha decays to become meitnerium nuclei, with mass numbers between 268 and 282. Parent roentgenium nuclei can be themselves decay products of [[Chemistry:Nihonium|nihonium]], [[Chemistry:Flerovium|flerovium]], [[Chemistry:Moscovium|moscovium]], [[Chemistry:Livermorium|livermorium]], or [[Chemistry:Tennessine|tennessine]].<ref name="nuclidetable">{{cite web|url=http://www.nndc.bnl.gov/chart/reCenter.jsp?z=109&n=169|title=Interactive Chart of Nuclides|publisher=Brookhaven National Laboratory|last=Sonzogni|first=Alejandro|location=National Nuclear Data Center|access-date=2008-06-06|archive-date=2018-03-07|archive-url=https://web.archive.org/web/20180307082344/http://www.nndc.bnl.gov/chart/reCenter.jsp?z=109&n=169|url-status=dead}}</ref> For example, in January 2010, the Dubna team ([[Organization:Joint Institute for Nuclear Research|JINR]]) identified meitnerium-278 as a product in the decay of tennessine via an alpha decay sequence:<ref name="e117" />

:{{nuclide|tennessine|294}} → {{nuclide|moscovium|290}} + {{nuclide|helium|4}}
:{{nuclide|moscovium|290}} → {{nuclide|nihonium|286}} + {{nuclide|helium|4}}
:{{nuclide|nihonium|286}} → {{nuclide|roentgenium|282}} + {{nuclide|helium|4}}
:{{nuclide|roentgenium|282}} → {{nuclide|meitnerium|278}} + {{nuclide|helium|4}}

====Nuclear isomerism====
;<sup>270</sup>Mt
Two atoms of <sup>270</sup>Mt have been identified in the [[Physics:Decay chain|decay chain]]s of <sup>278</sup>Nh. The two decays have very different lifetimes and decay energies and are also produced from two apparently different isomers of <sup>274</sup>Rg. The first isomer decays by emission of an alpha particle with energy 10.03&nbsp;MeV and has a lifetime of 7.16&nbsp;ms. The other alpha decays with a lifetime of 1.63&nbsp;s; the decay energy was not measured. An assignment to specific levels is not possible with the limited data available and further research is required.<ref name="04Mo01" />

;<sup>268</sup>Mt
The alpha decay spectrum for <sup>268</sup>Mt appears to be complicated from the results of several experiments. Alpha particles of energies 10.28, 10.22 and 10.10&nbsp;MeV have been observed, emitted from <sup>268</sup>Mt atoms with half-lives of 42&nbsp;ms, 21&nbsp;ms and 102&nbsp;ms respectively. The long-lived decay must be assigned to an isomeric level. The discrepancy between the other two half-lives has yet to be resolved. An assignment to specific levels is not possible with the data available and further research is required.<ref name="95Ho01" />

===Chemical yields of isotopes===

====Cold fusion====
The table below provides cross-sections and excitation energies for cold fusion reactions producing meitnerium isotopes directly. Data in bold represent maxima derived from excitation function measurements. + represents an observed exit channel.

{|class="wikitable" style="text-align:center"
|-
! Projectile !! Target !! CN !! 1n  !! 2n !! 3n
|-
|<sup>58</sup>Fe||<sup>209</sup>Bi||<sup>267</sup>Mt||'''7.5&nbsp;pb'''||||
|-
|<sup>59</sup>Co||<sup>208</sup>Pb||<sup>267</sup>Mt||2.6&nbsp;pb, 14.9&nbsp;MeV||||
|}

===Theoretical calculations===

====Evaporation residue cross sections====
The below table contains various targets-projectile combinations for which calculations have provided estimates for cross section yields from various neutron evaporation channels. The channel with the highest expected yield is given.

DNS = Di-nuclear system; HIVAP = heavy-ion vaporisation statistical-evaporation model; σ = cross section

{|class="wikitable" style="text-align:center"
|-
! Target !! Projectile !! CN !! Channel (product) !! σ<sub>max</sub> !! Model !! Ref
|-
!<sup>238</sup>U
|<sup>37</sup>Cl||<sup>275</sup>Mt||3n (<sup>272</sup>Mt)||13.31&nbsp;pb||DNS||<ref name="Feng108114">{{cite journal|last1=Feng|first1=Z.|last2=Jin|first2=G.|last3=Li|first3=J.|title=Production of new superheavy Z=108–114 nuclei with <sup>238</sup>U, <sup>244</sup>Pu and <sup>248,250</sup>Cm targets|date=2009|arxiv=0912.4069|journal=[[Physics:Physical Review C|Physical Review C]]|volume=80|pages=057601|doi=10.1103/PhysRevC.80.057601|s2cid=118733755 }}</ref>
|-
!<sup>244</sup>Pu
|<sup>31</sup>P||<sup>275</sup>Mt||3n (<sup>272</sup>Mt)||4.25&nbsp;pb||DNS||<ref name="Feng108114" />
|-
!<sup>243</sup>Am
|<sup>30</sup>Si||<sup>273</sup>Mt||3n (<sup>270</sup>Mt)||22&nbsp;pb||HIVAP||<ref name="Wang">
{{Cite journal
 |last1=Wang |first1=K.
 |year=2004
 |title=A Proposed Reaction Channel for the Synthesis of the Superheavy Nucleus ''Z'' = 109
 |journal=[[Physics:Chinese Physics Letters|Chinese Physics Letters]]
 |volume=21 |issue=3 |pages=464–467
 |arxiv=nucl-th/0402065
 |bibcode=2004ChPhL..21..464W
 |doi=10.1088/0256-307X/21/3/013
|s2cid=117308338
 |display-authors=0}}</ref>
|-
!<sup>243</sup>Am
|<sup>28</sup>Si||<sup>271</sup>Mt||4n (<sup>267</sup>Mt)||3&nbsp;pb||HIVAP||<ref name="Wang" />
|-
!<sup>248</sup>Cm
|<sup>27</sup>Al||<sup>275</sup>Mt||3n (<sup>272</sup>Mt)||27.83&nbsp;pb||DNS||<ref name="Feng108114" />
|-
!<sup>250</sup>Cm
|<sup>27</sup>Al||<sup>277</sup>Mt||5n (<sup>272</sup>Mt)||97.44&nbsp;pb||DNS||<ref name="Feng108114" />
|-
!<sup>249</sup>Bk
|<sup>26</sup>Mg||<sup>275</sup>Mt||4n (<sup>271</sup>Mt)||9.5&nbsp;pb||HIVAP||<ref name="Wang" />
|-
!<sup>254</sup>Es
|<sup>22</sup>Ne||<sup>276</sup>Mt||4n (<sup>272</sup>Mt)||8&nbsp;pb||HIVAP||<ref name="Wang" />
|-
!<sup>254</sup>Es
|<sup>20</sup>Ne||<sup>274</sup>Mt||4-5n (<sup>270,269</sup>Mt)||3&nbsp;pb||HIVAP||<ref name="Wang" />
|}

== References ==
{{reflist}}
* Isotope masses from:
**{{cite journal |author=M. Wang |author2=G. Audi |author3=A. H. Wapstra |author4=F. G. Kondev |author5=M. MacCormick |author6=X. Xu|year=2012 |title=The AME2012 atomic mass evaluation (II). Tables, graphs and references. |url=http://amdc.in2p3.fr/masstables/Ame2012/Ame2012b-v2.pdf |journal=Chinese Physics C |volume=36 |issue= 12 |pages=1603–2014 |doi=10.1088/1674-1137/36/12/003|bibcode = 2012ChPhC..36....3M |hdl=11858/00-001M-0000-0010-23E8-5 |s2cid=250839471 |display-authors=0}}
**{{NUBASE 2003}}
* Isotopic compositions and standard atomic masses from:
**{{CIAAW 2005}}
* Half-life, spin, and isomer data selected from the following sources.
**{{NUBASE 2003}}
**{{NNDC}}
**{{CRC85|chapter=11}}
**{{cite web |author=GSI |year=2011 |title=Superheavy Element Research at GSI |url=http://tan11.jinr.ru/pdf/08_Sep/S_1/01_Duellmann.pdf |publisher=GSI |access-date=7 February 2013}}

{{Navbox element isotopes}}

[[Category:Isotopes of meitnerium| ]]
[[Category:Lists of isotopes by element|Meitnerium]]

{{Sourceattribution|Isotopes of meitnerium}}