编辑“︁Uue”︁（章节）

====现在====
[[File:Curium oxide targets.jpg|thumb|RIKEN尝试合成Uue时所用的[[氧化锔]]-248目标<ref name=nelson/>]]

2018年1月，位于日本埼玉县[[和光市]]的[[理化学研究所]]（RIKEN）团队在开始用[[钒]]-51（<sup>51</sup>V）轰击[[锔]]-248（<sup>248</sup>Cm）目标来合成Uue。<ref name=sakai22/>由于较重的锫或[[锎]]难以制备，他们选择了锔来作为目标。<ref name="sakai">{{cite web |url=http://www0.mi.infn.it/~colo/slides_27_2_19/2019-2_Milano-WS_sakai.pdf |title=Search for a New Element at RIKEN Nishina Center |last=Sakai |first=Hideyuki |date=2019-02-27 |website=infn.it |access-date=2019-12-17 |language=en |archive-date=2021-12-09 |archive-url=https://web.archive.org/web/20211209203724/http://www0.mi.infn.it/~colo/slides_27_2_19/2019-2_Milano-WS_sakai.pdf }}</ref>[[橡树岭国家实验室]]提供反应中的<sup>248</sup>Cm目标，RIKEN则研发高能钒离子束。<ref name=usprogram>{{cite journal |url=https://www.osti.gov/servlets/purl/1896856 |title=The Status and Ambitions of the US Heavy Element Program |first1=J. |last1=Gates |first2=J. |last2=Pore |first3=H. |last3=Crawford |first4=D. |last4=Shaughnessy |first5=M. A. |last5=Stoyer |date=2022-10-25 |website=osti.gov |publisher= |access-date=2022-11-13 |doi=10.2172/1896856 |osti=1896856 |s2cid=253391052 |quote= |archive-date=2024-09-24 |archive-url=https://web.archive.org/web/20240924104831/https://www.osti.gov/biblio/1896856 |url-status=live }}</ref>RIKEN最初在回旋加速器开始实验，2020年完成直线粒子加速器的升级后也用以合成Uue。<ref>{{Cite web|url=https://www.nishina.riken.jp/about/greeting_e.html|title=Greeting &#124; RIKEN Nishina Center|quote=With the completion of the upgrade of the linear accelerator and BigRIPS at the beginning of 2020, the RNC aims to synthesize new elements from element 119 and beyond.|date=2020-04-01|first=Hiroyoshi|last=Sakurai|access-date=2021-03-05|archive-date=2021-12-02|archive-url=https://web.archive.org/web/20211202084613/https://www.nishina.riken.jp/about/greeting_e.html|url-status=live}}</ref>两台机器不断运作，直至观测到第一次事件。<ref name="ball19">{{cite journal |last=Ball |first=P. |title=Extreme chemistry: experiments at the edge of the periodic table |date=2019 |journal=Nature |volume=565 |issue=7741 |pages=552–555 |issn=1476-4687 |doi=10.1038/d41586-019-00285-9 |pmid=30700884 |bibcode=2019Natur.565..552B |s2cid=59524524 |doi-access=free |url=https://www.nature.com/magazine-assets/d41586-019-00285-9/d41586-019-00285-9.pdf |quote="We started the search for element 119 last June," says RIKEN researcher Hideto En'yo. "It will certainly take a long time — years and years — so we will continue the same experiment intermittently for 100 or more days per year, until we or somebody else discovers it." |access-date=2019-08-23 |archive-date=2019-04-12 |archive-url=https://web.archive.org/web/20190412102259/https://www.nature.com/magazine-assets/d41586-019-00285-9/d41586-019-00285-9.pdf |url-status=live }}</ref><ref name="sakai" />RIKEN团队的尝试会由[[天皇]]资助。<ref>{{cite web |url=https://eic.rsc.org/feature/the-hunt-is-on/3008580.article |title=The hunt is on |last1=Chapman |first1=Kit |last2=Turner |first2=Kristy |date=2018-02-13 |website=Education in Chemistry |publisher=Royal Society of Chemistry |access-date=2019-06-28 |language=en |quote=The hunt for element 113 was almost abandoned because of lack of resources, but this time Japan’s emperor is bankrolling Riken’s efforts to extend the periodic table to its eighth row. |archive-date=2019-07-20 |archive-url=https://web.archive.org/web/20190720192510/https://eic.rsc.org/feature/the-hunt-is-on/3008580.article }}</ref>

:{{nuclide|curium|248}} + {{nuclide|vanadium|51}} → {{nuclide|ununennium|299}}* → 还没有原子

产生的Uue同位素预计会经两次α衰变衰变成已知的[[镆]]同位素<sup>287</sup>Mc和<sup>288</sup>Mc。在这之后已知会发生五或六次α衰变事件，可以此证实它们的发现。<ref name=sakai22>{{cite journal |last1=Sakai |first1=Hideyuki |last2=Haba |first2=Hiromitsu |first3=Kouji |last3=Morimoto |first4=Naruhiko |last4=Sakamoto |date=2022-12-09 |title=Facility upgrade for superheavy-element research at RIKEN |journal=The European Physical Journal A |volume=58 |issue=238 |page=238 |doi=10.1140/epja/s10050-022-00888-3 |pmid=36533209 |pmc=9734366 |bibcode=2022EPJA...58..238S }}</ref><ref name=Mc2022>{{Cite journal |title=New isotope {{sup|286}}Mc produced in the {{sup|243}}Am+{{sup|48}}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 |article-number=064306 |doi=10.1103/PhysRevC.106.064306|bibcode=2022PhRvC.106f4306O |s2cid=254435744 |doi-access=free }}</ref>

截至2023年9月，RIKEN团队已尝试{{sup|248}}Cm+{{sup|51}}V反应长达462天。RIKEN的报告称虽然{{sup|248}}Cm+{{sup|51}}V反应预测不如{{sup|249}}Bk+{{sup|50}}Ti反应，但出于锔更易获得的因素选择前者。{{sup|249}}Bk+{{sup|50}}Ti反应更优是因为{{sup|50}}Ti发射体更靠近双幻数原子核{{sup|48}}Ca。此外，{{sup|50}}Ti的原子序为偶数（22），而涉及偶数原子序发射体的反应截面通常更高。<ref name=report/>尽管如此，{{sup|249}}Bk的短半衰期是该反应的弱点。<ref name=nelson/>报告也指出如果该反应未发现Uue原子，截面确认低于5&nbsp;fb，那么RIKEN团队会在继续尝试反应前重估实验策略。<ref name=report>{{cite web |url=https://www.riken.jp/medialibrary/riken/about/reports/evaluation/rnc/ncac/ncac2023-report-e.pdf |title=RIKEN Nishina Center Advisory Committee Report |last= |first= |date=2023-09-07 |website=riken.jp |publisher=Riken |access-date=2024-04-11 |quote= |archive-date=2024-09-24 |archive-url=https://web.archive.org/web/20240924105317/https://www.riken.jp/medialibrary/riken/about/reports/evaluation/rnc/ncac/ncac2023-report-e.pdf |url-status=live }}</ref>{{As of|2024|8}}，RIKEN团队仍全天候尝试该反应。<ref name=nelson>{{cite journal |last1=Nelson |first1=Felicity |date=2024-08-15 |title=How Japan Took the Lead in the Race to Discover Element 119 |journal=ACS Central Science |volume= 10|issue= 9|pages= 1669–1673|doi=10.1021/acscentsci.4c01266 |doi-access=free |pmid=39507239 |pmc=11539895 }}</ref>