编辑“︁Uue”︁（章节）

====以前====
114至118号元素（[[鈇]]至[[鿫]]）皆由位于俄罗斯[[杜布纳]]的[[杜布纳联合原子核研究所]]（JINR）通过热聚变反应发现，反应涉及用几乎稳定、富有中子的[[钙-48]]轰击从[[钚]]至[[锎]]的元素，合成有更多中子的超重元素。<ref name="Folden" />不过，119号元素无法轻易用此类反应合成，因为这需要用钙-48轰击[[锿]]元素。反应需要几十毫克的锿，但目前只能合成几微克的锿。<ref name=usprogram/>1985年，科学家在加州伯克利的superHILAC加速器通过用[[钙-48]]离子轰击不足一微克的锿-254，首次尝试合成Uue，结果失败。<ref>{{cite journal |last1=Lougheed |first1=R. |last2=Landrum |first2=J. |last3=Hulet |first3=E. |last4=Wild |first4=J. |last5=Dougan |first5=R. |last6=Dougan |first6=A. |last7=Gäggeler |first7=H. |last8=Schädel |first8=M. |last9=Moody |first9=K. |display-authors=3 |date=3 June 1985 |title=Search for superheavy elements using the {{sup|48}}Ca + {{sup|254}}Es{{sup|g}} reaction |url=https://journals.aps.org/prc/abstract/10.1103/PhysRevC.32.1760 |journal=Physical Review C |publication-date=1 November 1985 |volume=32 |issue=5 |pages=1760–1763 |bibcode=1985PhRvC..32.1760L |doi=10.1103/PhysRevC.32.1760 |pmid=9953034 |url-access=registration |access-date=21 March 2022 |archive-date=30 March 2022 |archive-url=https://web.archive.org/web/20220330005749/https://journals.aps.org/prc/abstract/10.1103/PhysRevC.32.1760 |url-status=live }}</ref>
:{{nuclide|einsteinium|254}} + {{nuclide|calcium|48}} → {{nuclide|ununennium|302}}* → 没有原子

对于更重的超重元素，更实际的合成反应需要使用比{{sup|48}}Ca重的发射体，<ref name="Folden">{{cite journal |last1=Folden III |first1=C. M. |last2=Mayorov |first2=D. A. |last3=Werke |first3=T. A. |last4=Alfonso |first4=M. C. |last5=Bennett |first5=M. E. |last6=DeVanzo |first6=M. J. |display-authors=2 |year=2013 |title=Prospects for the discovery of the next new element: Influence of projectiles with ''Z'' > 20 |url=https://iopscience.iop.org/article/10.1088/1742-6596/420/1/012007 |journal=Journal of Physics: Conference Series |publisher=IOP Publishing Ltd |volume=420 |issue=1 |at=012007 |arxiv=1209.0498 |bibcode=2013JPhCS.420a2007F |doi=10.1088/1742-6596/420/1/012007 |s2cid=119275964 |access-date=2022-03-21 |archive-date=2022-03-21 |archive-url=https://web.archive.org/web/20220321211112/https://iopscience.iop.org/article/10.1088/1742-6596/420/1/012007 |url-status=live }}</ref>但这会使得反应更对称，<ref name=search/>更难成功。<ref name=usprogram/>由于反应[[截面 (物理)|截面]]降低，合成的同位素的[[半衰期]]也预测极短，{{sfn|Zagrebaev|Karpov|Greiner|2013}}只有几微秒，<ref name="Haire" /><ref name="Hofmann">{{cite book |last=Hofmann |first=Sigurd |editor1-first=Walter |editor1-last=Greiner |date=2013 |title=Overview and Perspectives of SHE Research at GSI SHIP |pages=23–32 |doi=10.1007/978-3-319-00047-3 |isbn=978-3-319-00046-6 |url=http://cds.cern.ch/record/1551965 |language=en |access-date=2021-12-02 |archive-date=2021-04-17 |archive-url=https://web.archive.org/web/20210417211124/http://cds.cern.ch/record/1551965 }}</ref>119号元素的合成将突破当前技术的极限。

从2012年4月到9月，德国[[达姆施塔特]]的[[亥姆霍兹重离子研究中心]]（GSI）通过用[[钛]]-50轰击[[锫]]-249，尝试合成<sup>295</sup>Uue和<sup>296</sup>Uue。<ref name="economist">[http://www.economist.com/node/21554502 Modern alchemy: Turning a line] {{Wayback|url=http://www.economist.com/node/21554502 |date=20170523091850 }}, [[The Economist]], May 12, 2012.</ref><ref name="Khuyagbaatar">[http://asrc.jaea.go.jp/soshiki/gr/chiba_gr/workshop2/&Khuyagbaatar.pdf Superheavy Element Search Campaign at TASCA] {{Wayback|url=http://asrc.jaea.go.jp/soshiki/gr/chiba_gr/workshop2/%26Khuyagbaatar.pdf |date=20160304082115 }}. J. Khuyagbaatar</ref>由于<sup>249</sup>Bk和<sup>50</sup>Ti的反应在可以实际运行的反应中最不对称，{{sfn|Zagrebaev|Karpov|Greiner|2013}}它最有可能合成出119号元素。<ref name="Khuyagbaatar" />而且，锫-249会衰变成下一个元素[[锎]]-249，半衰期只有短短的327天，所以反应可以同时尝试合成119和120号元素。<ref name="search">{{cite journal |last1=Khuyagbaatar |first1=J. |last2=Yakushev |first2=A. |last3=Düllmann |first3=Ch. E. |display-authors=etal |date=2020 |title=Search for elements 119 and 120 |url=https://jyx.jyu.fi/bitstream/handle/123456789/73027/2/khuyagbaatarym0812.pdf |journal=Physical Review C |volume=102 |issue=6 |at=064602 |doi=10.1103/PhysRevC.102.064602 |bibcode=2020PhRvC.102f4602K |s2cid=229401931 |access-date=25 January 2021 |language=en |archive-date=2021-12-09 |archive-url=https://web.archive.org/web/20211209203725/https://jyx.jyu.fi/bitstream/handle/123456789/73027/2/khuyagbaatarym0812.pdf }}</ref>由于Uue的半衰期预计较短，GSI团队使用了能够在微秒内记录衰变事件的新型快速电子设备。<ref name="Khuyagbaatar" />{{sfn|Zagrebaev|Karpov|Greiner|2013}}
:{{nuclide|berkelium|249}} + {{nuclide|titanium|50}} → {{nuclide|ununennium|299}}* → 没有原子
:{{nuclide|californium|249}} + {{nuclide|titanium|50}} → {{nuclide|unbinilium|299}}* → 没有原子

反应没发现119或120号元素。<ref name="Yakushev">{{cite web | url=http://asrc.jaea.go.jp/soshiki/gr/chiba_gr/workshop3/%26Yakushev.pdf | title=Superheavy Element Research at TASCA | access-date=2024-01-26 | archive-date=2016-03-04 | archive-url=https://web.archive.org/web/20160304082617/http://asrc.jaea.go.jp/soshiki/gr/chiba_gr/workshop3/%26Yakushev.pdf | url-status=live }}</ref><ref name="search"/>这个实验原本会持续到2012年11月，<ref>{{Cite web|url=https://www-win.gsi.de/tasca12/program/contributions/TASCA12_Duellmann.pdf|title=Search for element 119: Christoph E. Düllmann for the ''TASCA E119'' collaboration|access-date=2015-09-15|archive-url=https://web.archive.org/web/20160304094201/https://www-win.gsi.de/tasca12/program/contributions/TASCA12_Duellmann.pdf|archive-date=2016-03-04|url-status=dead|language=en}}</ref>但实验人员把发射体改成<sup>48</sup>Ca以确认[[鿬]]的发现，提早结束实验。<ref name="Yakushev" />