Editing Bohrium (section)

==Isotopes==
{{main|Isotopes of bohrium}}
{{clear}}
{{Isotopes summary
|element=bohrium
|isotopes=
{{isotopes summary/isotope
|mn=260|sym=Bh|hl={{sort|41|41 ms}}|ref={{NUBASE2020|ref}}
|dm=α |year=2007|re=<sup>209</sup>Bi(<sup>52</sup>Cr,n)<ref name="260Bh">{{cite journal|last1=Nelson|first1=S.|last2=Gregorich|first2=K.|last3=Dragojević|first3=I.|last4=Garcia|first4=M.|last5=Gates|first5=J.|last6=Sudowe|first6=R.|last7=Nitsche|first7=H.|title=Lightest Isotope of Bh Produced via the Bi209(Cr52,n)Bh260 Reaction|journal=Physical Review Letters|volume=100|date=2008|doi=10.1103/PhysRevLett.100.022501|issue=2|bibcode=2008PhRvL.100b2501N|pmid=18232860|page=022501|s2cid=1242390 |url=https://digital.library.unt.edu/ark:/67531/metadc895291/m2/1/high_res_d/923353.pdf |archive-url=https://ghostarchive.org/archive/20221009/https://digital.library.unt.edu/ark:/67531/metadc895291/m2/1/high_res_d/923353.pdf |archive-date=2022-10-09 |url-status=live}}</ref>
}}
{{isotopes summary/isotope
|mn=261|sym=Bh|hl={{sort|12|12.8 ms}}|ref={{NUBASE2020|ref}}
|dm=α |year=1986|re=<sup>209</sup>Bi(<sup>54</sup>Cr,2n)<ref name="261Bh">{{cite journal|doi=10.1007/BF01565147|title=Element 107|date=1989|author=Münzenberg, G.|journal=Zeitschrift für Physik A|volume=333|pages=163
|last2=Armbruster|first2=P.|last3=Hofmann|first3=S.|last4=Heßberger|first4=F. P.|last5=Folger|first5=H.|last6=Keller|first6=J. G.|last7=Ninov|first7=V.|last8=Poppensieker|first8=K.|last9=Quint|first9=A. B.|display-authors=8
|issue=2|bibcode = 1989ZPhyA.333..163M |s2cid=186231905}}</ref>
}}
{{isotopes summary/isotope
|mn=262|sym=Bh|hl={{sort|84|84 ms}}|ref={{NUBASE2020|ref}}
|dm=α |year=1981|re=<sup>209</sup>Bi(<sup>54</sup>Cr,n)<ref name="262Bh" />
}}
{{isotopes summary/isotope
|mn=262m|sym=Bh|hl={{sort|9|9.5 ms}}|ref={{NUBASE2020|ref}}
|dm=α |year=1981|re=<sup>209</sup>Bi(<sup>54</sup>Cr,n)<ref name="262Bh" />
}}
{{isotopes summary/isotope
|mn=264|sym=Bh|hl={{sort|1070|1.07 s}}|ref={{NUBASE2020|ref}}
|dm=α |year=1994|re=<sup>272</sup>Rg(—,2α)<ref name="264Bh">{{cite journal
|doi=10.1007/BF01291182
|title=The new element 111
|year=1995
|author=Hofmann, S.
|journal=Zeitschrift für Physik A
|volume=350
|pages=281
|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
}}</ref>
}}
{{isotopes summary/isotope
|mn=265|sym=Bh|hl={{sort|1190|1.19 s}}|ref={{NUBASE2020|ref}}
|dm=α |year=2004|re=<sup>243</sup>Am(<sup>26</sup>Mg,4n)<ref name="265Bh">{{cite journal|title=New isotope <sup>265</sup>Bh|doi=10.1140/epja/i2004-10020-2|date=2004|author=Gan, Z.G.|journal=The European Physical Journal A|volume=20|last2=Guo|first2=J. S.|last3=Wu|first3=X. L.|last4=Qin|first4=Z.|last5=Fan|first5=H. M.|last6=Lei|first6=X. G.|last7=Liu|first7=H. Y. |last8=Guo|first8=B.|last9=Xu|first9=H. G.|display-authors=8
|pages=385|issue=3|bibcode = 2004EPJA...20..385G |s2cid=120622108}}</ref>
}}
{{isotopes summary/isotope
|mn=266|sym=Bh|hl={{sort|10600|10.6 s}}|ref={{NUBASE2020|ref}}
|dm=α |year=2000|re=<sup>249</sup>Bk(<sup>22</sup>Ne,5n)<ref name="266Bh">{{cite journal|doi=10.1103/PhysRevLett.85.2697|title=Evidence for New Isotopes of Element 107: <sup>266</sup>Bh and <sup>267</sup>Bh|date=2000|author=Wilk, P. A.|journal=Physical Review Letters|volume=85|pages=2697–700|pmid=10991211|last2=Gregorich|first2=K. E.|last3=Turler|first3=A.|last4=Laue|first4=C. A.|last5=Eichler|first5=R.|last6=Ninov V|first6=V.|last7=Adams|first7=J. L.|last8=Kirbach|first8=U. W.|last9=Lane|first9=M. R.|display-authors=8|issue=13|bibcode=2000PhRvL..85.2697W|url=https://zenodo.org/record/1233933|access-date=2018-11-04|archive-date=2019-12-26|archive-url=https://web.archive.org/web/20191226214323/https://zenodo.org/record/1233933|url-status=live}}</ref>
}}
{{isotopes summary/isotope
|mn=267|sym=Bh|hl={{sort|22000|22 s}}|ref={{NUBASE2020|ref}}
|dm=α |year=2000|re=<sup>249</sup>Bk(<sup>22</sup>Ne,4n)<ref name="266Bh" />
}}
{{isotopes summary/isotope
|mn=270|sym=Bh|hl={{sort|144000|2.4 min}}|ref=<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>
|dm=α |year=2006|re=<sup>282</sup>Nh(—,3α)<ref name="270Bh">{{cite conference |doi=10.1063/1.2746600 |isbn=978-0-7354-0420-5 |book-title=AIP Conference Proceedings: International Symposium on Exotic Nuclei |date=2007 |last1=Oganessian |first1=Yu. Ts. |editor-last=Penionzhkevich |editor-first=Yu. E. |editor2-last=Cherepanov |editor2-first=E. A. |volume=912 |pages=235 |title=Heaviest Nuclei Produced in 48Ca-induced Reactions (Synthesis and Decay Properties)}}</ref>
}}
{{isotopes summary/isotope
|mn=271|sym=Bh|hl={{sort|2900|2.9 s}}|ref=<ref name=Mc2022/>
|dm=α |year=2003|re=<sup>287</sup>Mc(—,4α)<ref name="270Bh" />
}}
{{isotopes summary/isotope
|mn=272|sym=Bh|hl={{sort|8800|8.8 s}}|ref=<ref name=Mc2022/>
|dm=α |year=2005|re=<sup>288</sup>Mc(—,4α)<ref name="270Bh" />
}}
{{isotopes summary/isotope
|mn=274|sym=Bh|hl={{sort|57000|57 s}}|ref={{NUBASE2020|ref}}
|dm=α |year=2009|re=<sup>294</sup>Ts(—,5α)<ref name="274Bh">{{cite journal|last1=Oganessian |first1=Yuri Ts.|last2=Abdullin |first2=F. Sh.|last3=Bailey |first3=P. D.|display-authors=etal|title=Synthesis of a New Element with Atomic Number ''Z''=117 |date=2010-04-09 |journal=Physical Review Letters |publisher=American Physical Society |volume=104 <!--|issue=14 -->|number=142502 |doi=10.1103/PhysRevLett.104.142502 |pmid=20481935 |bibcode=2010PhRvL.104n2502O |url=https://www.researchgate.net/publication/44610795  }}</ref>
}}
{{isotopes summary/isotope
|mn=278|sym=Bh|hl={{sort|690000|11.5 min?}}|ref=<ref name=Hofmann2016/>
|dm=SF |year=1998?|re=<sup>290</sup>Fl(e<sup>−</sup>,ν<sub>e</sub>3α)?
}}
}}

Bohrium 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 of bohrium have been reported with atomic masses 260–262, 264–267, 270–272, 274, and 278, one of which, bohrium-262, has a known [[metastable state]]. All of these but the unconfirmed <sup>278</sup>Bh decay only through alpha decay, although some unknown bohrium isotopes are predicted to undergo spontaneous fission.<ref name="nuclidetable">{{cite web |url=http://www.nndc.bnl.gov/chart/reCenter.jsp?z=107&n=163 |title=Interactive Chart of Nuclides |publisher=Brookhaven National Laboratory |author=Sonzogni, Alejandro |location=National Nuclear Data Center |access-date=2008-06-06 |archive-date=2019-04-02 |archive-url=https://web.archive.org/web/20190402195353/https://www.nndc.bnl.gov/nudat2/ |url-status=dead }}</ref>

The lighter isotopes usually have shorter half-lives; half-lives of under 100&nbsp;ms for <sup>260</sup>Bh, <sup>261</sup>Bh, <sup>262</sup>Bh, and <sup>262m</sup>Bh were observed. <sup>264</sup>Bh, <sup>265</sup>Bh, <sup>266</sup>Bh, and <sup>271</sup>Bh are more stable at around 1&nbsp;s, and <sup>267</sup>Bh and <sup>272</sup>Bh have half-lives of about 10&nbsp;s. The heaviest isotopes are the most stable, with <sup>270</sup>Bh and <sup>274</sup>Bh having measured half-lives of about 2.4&nbsp;min and 40&nbsp;s respectively, and the even heavier unconfirmed isotope <sup>278</sup>Bh appearing to have an even longer half-life of about 11.5 minutes.

The most proton-rich isotopes with masses 260, 261, and 262 were directly produced by cold fusion, those with mass 262 and 264 were reported in the decay chains of meitnerium and roentgenium, while the neutron-rich isotopes with masses 265, 266, 267 were created in irradiations of actinide targets. The five most neutron-rich ones with masses 270, 271, 272, 274, and 278 (unconfirmed) appear in the decay chains of <sup>282</sup>Nh, <sup>287</sup>Mc, <sup>288</sup>Mc, <sup>294</sup>Ts, and <sup>290</sup>Fl respectively. The half-lives of bohrium isotopes range from about ten&nbsp;milliseconds for <sup>262m</sup>Bh to about one&nbsp;minute for <sup>270</sup>Bh and <sup>274</sup>Bh, extending to about 11.5 minutes for the unconfirmed <sup>278</sup>Bh, which may have one of the longest half-lives among reported superheavy nuclides.<ref name="Doi_">{{cite book |last1=Münzenberg|first1=G.|last2=Gupta|first2=M. |chapter=Production and Identification of Transactinide Elements |editor-first=Attila |editor-last=Vértes |editor-first2=Sándor |editor-last2=Nagy |editor-first3=Zoltán |editor-last3=Klencsár |editor-first4=Rezső G. |editor-last4=Lovas |editor-first5=Frank |editor-last5=Rösch |title=Handbook of Nuclear Chemistry: Production and Identification of Transactinide Elements |page=877 |date=2011 |doi=10.1007/978-1-4419-0720-2_19 |isbn=978-1-4419-0719-6}}</ref>