Spectroscopic information such as production, identification, half-lives, decay modes and possible excited states for experimentally known nuclides of mass numbers 266, 270, 274, 278, 282, 286, 290, 294, and 298 are presented together with the recommended values, superseding information and data in the previous ENSDF and NDS evaluation by 2005Gu33. No nuclides have yet been identified for A=302. In the last 14 years, large amounts of new and definitive data on the superheavy nuclides (SHN) have become available, thus changing almost entirely the landscape of nuclear data in this mass region, as also indicated by a number of recent review articles: 2017Og01, 2016Ho09, 2016Ho06 (for fission barriers), 2015Og05, 2015Og07, 2015Mo25, 2015OgZX, 2013Th02, and 2011Og07. See 2016Ka49 for IUPAC technical discussions for the discovery of Z=117 (Ts), Z=115 (Mc), Z=113 (Nh), 2001Ka70 and 2003Ka71 for Z=110-112, 2011Ba54 for Z≥113, 2009Ba62 for Z=112, and 2016Ka50 for Z=118 (Og). A special issue of Nuclear Physics A444 (2015) is devoted to research on superheavy elements (SHE) with 27 articles. In particular, see article by 2015Ko20 on mass spectrometric searches for superheavy elements in terrestrial matter. See also Proceedings of Nobel Symposium NS160 ‘Chemistry and Physics of Heavy and Superheavy Elements’ published in Eur. Phys. Jour. Web of Conferences 131 (2016), in particular 2016UtZZ, 2016DmZZ and 2016HoZY. See also 2016DuZX for future prospects of discovery of elements beyond Z=118

A=266: ²⁶⁶Db, ²⁶⁶Sg, ²⁶⁶Bh, ²⁶⁶Hs and ²⁶⁶Mt are the experimentally identified nuclides with A=266. Identification of ²⁶⁶Lr from α decay of ²⁷⁰Db has been proposed by 2014Kh04 from experiments at GSI, but complete details and analyses of all the four decay chains reported in this experiment have not yet been published, and discussion in 2015Og05 review article considering their work from Dubna (2013Og04, 2011Og04) and from GSI (2014Kh04) still concluded that ²⁷⁰Db decayed dominantly by SF mode, in contrast with dominant α decay mode proposed by 2014Kh04. Experiments carried out at FLNR-JINR-Dubna in collaboration with LLNL and ORNL, GSI-SHIP facility, RIKEN, and LBNL facilities: ²⁶⁶Db from the α-decay of ²⁸²Nh in two correlated decay chains at Dubna; ²⁶⁶Sg as α-daughter of ²⁷⁰Hs in 12 correlated decay chains at Dubna and GSI; ²⁶⁶Bh in α decay of ²⁷⁸Nh in three correlated decay chains observed at RIKEN, and also directly with one event in ²⁴⁹Bk(²²Ne,5n) at LBNL, and with four events in ²⁴³Am(²⁶Mg,3n) at HIRFL-Lanzhou; ²⁶⁶Hs as α-daughter of ²⁷⁰Ds at GSI in two different experiments, six correlated decays in the first, and 25 decay chains in the second experiment, the analysis of which has not been fully reported as yet; and ²⁶⁶Mt directly in ²⁰⁹Bi(⁵⁸Fe,n) reaction at GSI in two different experiments, observing three events in the first experiment and 12 events in the second, also produced in ²⁰⁸Pb(⁵⁹Co,n) reaction at LBNL, observing five correlated decay chains. See also 2000Ho27 for discussion on ²⁶⁶Sg and ²⁶⁶Mt.

A=270: ²⁷⁰Db, ²⁷⁰Bh, ²⁷⁰Hs, ²⁷⁰Mt and ²⁷⁰Ds are the experimentally identified nuclides with A=270 are presented. Experiments carried out at FLNR-JINR-Dubna in collaboration with LLNL and ORNL, GSI-SHIP facility, and RIKEN: ²⁷⁰Db from the decay of ²⁹⁴Ts in six correlated decay chains at Dubna and GSI; ²⁷⁰Bh as α great-granddaughter of ²⁸²Nh in two correlated decay chains observed at Dubna; ²⁷⁰Hs directly in ²⁴⁸Cm(²⁶Mg,4n) reaction at GSI, and in ²²⁶Ra(⁴⁸Ca,4n) reaction at Dubna; ²⁷⁰Mt as granddaughter of ²⁷⁸Ts in three correlated decay chains at RIKEN; and ²⁷⁰Ds directly in ²⁰⁷Pb(⁶⁴Ni,n) at GSI in 33 correlated decay chains.

A=274: ²⁷⁴Bh, ²⁷⁴Mt and ²⁷⁴Rg are the experimentally identified nuclides with A=274. Search for ²⁷⁴Ds in ²³⁸U(⁴⁰Ar, 4n),E=5.7 MeV/nucleon reaction and subsequent α decays at GSI (1990Sc11) proved negative. Experiments carried out at FLNR-JINR-Dubna in collaboration with LLNL and ORNL, GSI-SHIP facility, and RIKEN: ²⁷⁴Bh from the decay of ²⁹⁴Ts in six correlated decay chains at Dubna and GSI, ²⁷⁴Mt produced as α daughter of ²⁸²Nh in two correlated decay chains observed at Dubna, and ²⁷⁴Rg as α daughter of ²⁷⁸Nh produced in three correlated decay chains at RIKEN.

A=278: ²⁷⁸Mt, ²⁷⁸Rg and ²⁷⁸Nh are the experimentally identified nuclides with A=278. A very tentative evidence is provided for ²⁷⁸Bh and ²⁷⁸Hs from a chain originally observed and assigned to ²⁸⁹Fl by 1999Og10, but later reassigned by 2004Og10 to ²⁹⁰Fl, and further discussed in detail by 2016Ho09, where, based on systematics of α decays and SF half-lives, ²⁹⁰Fl is proposed to decay via ε mode to ²⁹⁰Nh, which then decays by an α chain, ending in ²⁷⁸Bh that decays by SF mode. Experiments carried out at FLNR-JINR-Dubna in collaboration with LLNL and ORNL labs in the USA, GSI-SHIP facility, and RIKEN: ²⁷⁸Mt from the decay of ²⁹⁴Ts in six correlated decay chains at Dubna and GSI, ²⁷⁸Rg produced as α daughter of ²⁸²Nh in two correlated decay chains observed at Dubna, and ²⁷⁸Nh produced directly in three correlated decay chains at RIKEN.

A=282: ²⁸²Rg, ²⁸²Cn and ²⁸²Nh are the experimentally identified nuclides with A=282. A very tentative evidence is provided for ²⁸²Mt and ²⁸²Ds from a chain originally observed and assigned to ²⁸⁹Fl by 1999Og10, but later reassigned by 2004Og10 to ²⁹⁰Fl, and further discussed in detail by 2016Ho09, where, based on systematics of α decays and SF half-lives, ²⁹⁰Fl is proposed to decay via ε mode to ²⁹⁰Nh, which then decays by an α chain, ending in ²⁷⁸Bh that decays by SF mode. Experiments carried out at FLNR-Dubna, in collaboration with LLNL and ORNL labs in the USA, and at GSI-SHIP facility confirm the identification of these isotopes, ²⁸²Rg in α decay chain of ²⁹⁴Ts in six correlated decay chains at Dubna and GSI, ²⁸²Cn produced in four ways at Dubna: independently in one correlated decay chain, as α daughter of ²⁸⁶Lv in 11 correlated decay chains, as α grand-daughter of ²⁹⁰Lv in 12 correlated decay chains, as α great-grand daughter of ²⁹⁴Og in four correlated decay chains, and ²⁸²Nh produced at Dubna directly in two correlated decay chains.

A=286: ²⁸⁶Nh and ²⁸⁶Fl are the only experimentally identified nuclides with A=286. A very tentative evidence is provided for ²⁸⁶Rg and ²⁸⁶Cn from a chain originally observed and assigned to ²⁸⁹Fl by 1999Og10, but later reassigned by 2004Og10 to ²⁹⁰Fl, and further discussed in detail by 2016Ho09, where, based on systematics of α decays and SF half-lives, ²⁹⁰Fl is proposed to decay via ε mode to ²⁹⁰Nh, which then decays by an α chain, ending in ²⁷⁸Bh that decays by SF mode. 2017Ka66 in experiments at RIKEN using GARIS separator interpret one correlated decay chain in three different ways, one involving possible production of ²⁹⁴Lv in ²⁴⁸Cm(⁴⁸Ca,2n),E=261.6 MeV, and α decay to ²⁹⁰Fl which further decays to ²⁸⁶Cn. Experiments carried out at FLNR-Dubna, in collaboration with LLNL and ORNL labs in the USA, and at GSI-SHIP facility confirm the identification of these isotopes, ²⁸⁶Nh as α grand-daughter of ²⁹⁴Ts in six correlated decay chains, and ²⁸⁶Fl produced in three ways: independently in 11 correlated decay chains, as α daughter of ²⁹⁰Lv in 12 correlated decay chains, and as α grand-daughter of ²⁹⁴Og in four correlated decay chains.

A=290: ²⁹⁰Mc and ²⁹⁰Lv are the only experimentally identified nuclides with A=290. A tentative evidence is provided for ²⁹⁰Nh and ²⁹⁰Fl from a chain originally observed and assigned to ²⁸⁹Fl by 1999Og10, but later reassigned by 2004Og10 to ²⁹⁰Fl, and further discussed in detail by 2016Ho09, where, based on systematics of α decays and SF half-lives, ²⁹⁰Fl is proposed to decay via ε mode to ²⁹⁰Nh, which then decays by an α chain, ending in ²⁷⁸Bh that decays by SF mode. 2017Ka66 in experiments at RIKEN using GARIS separator interpret one correlated decay chain in three different ways, one involving possible production of ²⁹⁴Lv in ²⁴⁸Cm(⁴⁸Ca,2n),E=261.6 MeV, and α decay to ²⁹⁰Fl. Experiments carried out at FLNR-Dubna, in collaboration with LLNL and ORNL labs in the USA, and at GSI-SHIP facility confirm the identification of these isotopes, ²⁹⁰Mc as α daughter of ²⁹⁴Ts in six correlated decay chains, and ²⁹⁰Lv produced in two ways, independently in 14 correlated decay chains, and as α daughter of ²⁹⁴Og in four correlated decay chains.

A=294: ²⁹⁴Ts and ²⁹⁴Og are the only experimentally identified nuclides with A=294. Experiments carried out at FLNR-Dubna, in collaboration with LLNL and ORNL labs in the USA, and at GSI-SHIP facility confirm the identification of these isotopes, with a total of six EVR-α-SF correlated decay chains observed for ²⁹⁴Ts and four for ²⁹⁴Og. Tentative identification of ²⁹⁴Lv is provided by 2017Ka66 from the observation one correlated event using GARIS-RIKEN facility, where this event is interpreted in three possible ways, two interpretations lead to production of ²⁹³Lv and successive odd-A nuclides of ²⁸⁹Fl, ²⁸⁵Cn and ²⁸¹Ds, whereas the third prediction starts with the production of ²⁹⁴Lv and successive ²⁹⁰Fl and ²⁸⁶Cn nuclides. Search for ²⁹⁴Rg in natural gold materials (2011De03), and for ²⁹⁴Ds, ²⁹⁴Fl and ²⁹⁴Mc in natural Pt, Pb and Bi samples (2011De21) using accelerator mass spectroscopy (AMS) proved negative, with extremely low upper limits established. Also 1980St05 did not see any evidence for ²⁹⁴Ds in natural Pt sample using AMS.

A=298: Search for ²⁹⁸120 through fusion-evaporation reaction at Dubna, and for ²⁹⁸Fl and ²⁹⁸Mc in natural Pt, Pb and Bi samples using accelerator mass spectroscopy (AMS) proved negative. Tentative assignment of three α-α-α decay chains by 2016Ho09 to ²⁹⁹120 in ²⁴⁸Cm(⁵⁴Cr,3n)²⁹⁹120 at GSI was refuted by 2017He11, assigning these correlations to random events, instead.

A=302: Fluorescent x rays from Z=120 element were observed by 2012Fr03 from compound nucleus ³⁰²120 produced in ²³⁸U(⁶⁴Ni,X),E=6.6 MeV/nucleon at GANIL, and x-ray yields were measured, together with minimum average time deduced from x-ray multiplicity. The compound nucleus could decay by 3n- or 4n-channels to produce ²⁹⁹120 or ²⁹⁸120. 2012He05 and 2016Ho09 also produced ³⁰²120 compound nucleus in ²⁴⁸Cm(⁵⁴Cr, xn)³⁰²120^*,E=6.035 MeV/nucleon; and ²³⁸U(⁶⁴Ni,xn)³⁰²120^*,E=5.53 MeV/nucleon reactions using UNILAC at GSI. Three α-α-α correlated decays from ²⁴⁸Cm(⁵⁴Cr,xn)³⁰²120^* reaction were tentatively assigned by 2016Ho09 to ²⁹⁹120 decay, however, a detailed analysis by 2017He11 refuted this claim, ascribing these events to random sequences. There are no data tables for A=302.

给出了质量数为266、270、274、278、282、286、290、294和298的实验已知核素的光谱信息，例如产生，鉴定，半衰期，衰变模式和可能的激发态，以及建议值，并在2005Gu33之前的ENSDF和NDS评估中取代了信息和数据。尚未发现A = 302的核素。在过去的14年中，已经获得了有关超重核素（SHN）的大量新的权威性数据，从而几乎完全改变了该质量区域核数据的格局，正如最近的许多评论文章所指出的：2017Og01 ，2016Ho09、2016Ho06（用于裂变屏障），2015Og05、2015Og07、2015Mo25、2015OgZX，2013Th02和2011Og07。有关发现Z = 117（Ts）的IUPAC技术讨论，请参阅2016Ka49。Z = 115（Mc），Z = 113（Nh），Z = 110-112的2001Ka70和2003Ka71，Z≥113的2011Ba54，Z = 112的2009Ba62和Z = 118（Og）的2016Ka50。特刊《核物理》 A444（2015）专门研究超重元素（SHE），共有27篇文章。特别是，请参阅2015Ko20上有关质谱搜索地球物质中超重元素的文章。另请参阅在Eur上发表的Nobel Symposium NS160“重和超重元素的化学和物理”的论文集。物理 周杰伦 会议网络131（2016），尤其是2016UtZZ，2016DmZZ和2016HoZY。另请参阅2016DuZX了解Z = 118以外元素的未来发现前景 特刊《核物理》 A444（2015）专门研究超重元素（SHE），共有27篇文章。特别是，请参阅2015Ko20上有关质谱搜索地球物质中超重元素的文章。另请参阅在Eur上发表的Nobel Symposium NS160“重和超重元素的化学和物理”的论文集。物理 周杰伦 会议网络131（2016），尤其是2016UtZZ，2016DmZZ和2016HoZY。另请参阅2016DuZX了解Z = 118以外元素的未来发现前景 特刊《核物理》 A444（2015）专门研究超重元素（SHE），共有27篇文章。特别是，请参阅2015Ko20上有关质谱搜索地球物质中超重元素的文章。另请参见在Eur上发表的Nobel Symposium NS160“重和超重元素的化学与物理”的论文集。物理 周杰伦 会议网络131（2016），尤其是2016UtZZ，2016DmZZ和2016HoZY。另请参阅2016DuZX了解Z = 118以外元素的未来发现前景 2016DmZZ和2016HoZY。另请参阅2016DuZX了解Z = 118以外元素的未来发现前景 2016DmZZ和2016HoZY。另请参阅2016DuZX了解Z = 118以外元素的未来发现前景

A = 266：²⁶⁶ Db，²⁶⁶ Sg，²⁶⁶ Bh，²⁶⁶ Hs和²⁶⁶ Mt是实验确定的A = 266核素。2014年Kh04在GSI的实验中提出了从²⁷⁰ Db的α衰变中鉴定²⁶⁶ Lr的方法，但该实验报告的所有四个衰变链的完整细节和分析尚未公布，并在2015Og05评论文章中讨论了它们的工作来自Dubna（2013Og04，2011Og04）和GSI（2014Kh04）的结论仍然得出结论，与显性α相比，SF模式显着衰减了²⁷⁰ Db衰减模式由2014Kh04提出。在FLNR-JINR-Dubna与LLNL和ORNL，GSI-SHIP设施，RIKEN和LBNL设施合作进行的实验：²⁸² Nh的α衰变产生²⁶⁶ Db，位于Dubna的两个相关衰变链中；在Dubna和GSI的12条相关衰变链中，²⁶⁶ Sg为²⁷⁰ Hs的α-子; ²⁶⁶了Bh在α衰变²⁷⁸新罕布什尔在三个相关衰变链在RIKEN与一个事件观察到，也可以直接在²⁴⁹ BK（²²在LBNL氖，5N），并与四个事件²⁴³ AM（²⁶在HIRFL的Mg，3N） -兰州;在两个不同的实验中，GSI的²⁶⁶ Hs是²⁷⁰ Ds的α-子，在第一个实验中有六个相关的衰变，在第二个实验中有25个衰变链，有关分析尚未完全报道。在两个不同的实验中，分别在GSI的²⁰⁹ Bi（⁵⁸ Fe，n）反应中和²⁶⁶ Mt的反应，观察到第一个实验中的三个事件和第二个实验中的12个事件，也在LBNL的²⁰⁸ Pb（⁵⁹ Co，n）反应中产生，观察五个相关的衰减链。有关²⁶⁶ Sg和²⁶⁶ Mt的讨论，另请参见2000Ho27 。

A = 270：²⁷⁰ Db，²⁷⁰ Bh，²⁷⁰ Hs，²⁷⁰ Mt和²⁷⁰ Ds是实验鉴定出的A = 270的核素。在FLNR-JINR-Dubna与LLNL和ORNL，GSI-SHIP设施和RIKEN合作进行的实验：来自Dubna和GSI六个相关衰变链中²⁹⁴ Ts衰变的²⁷⁰ Db ；在杜布纳观察到的两个相关的衰变链中，作为²⁸² Nh的α大孙女为²⁷⁰ Bh ；在GSI的²⁴⁸ Cm（²⁶ Mg，4n）反应中和^226中直接产生²⁷⁰ HsDubna的Ra（⁴⁸ Ca，4n）反应; 在RIKEN的三个相关衰变链中，作为²⁷⁸ Ts的孙女为²⁷⁰ Mt ；和^270个Ds的直接在²⁰⁷铅（⁶⁴在GSI的Ni，n）的在33支相关衰变链。

A = 274：²⁷⁴ Bh，²⁷⁴ Mt和²⁷⁴ Rg是实验确定的A = 274的核素。在²³⁸ U（⁴⁰ Ar，4n）中搜索²⁷⁴ Ds ，E = 5.7 MeV /核子反应，随后在GSI（1990Sc11）处的α衰变被证明是阴性的。在FLNR-JINR-Dubna上与LLNL和ORNL，GSI-SHIP设施和RIKEN合作进行的实验：来自Dubna和GSI六个相关衰变链中²⁹⁴ Ts衰变的²⁷⁴ Bh ，产生了²⁷⁴ Mt作为^282的α子在杜布纳观测到的两个相关衰变链中的Nh在RIKEN的三个相关衰变链中产生了²⁷⁸ Rh的α子代，为²⁷⁴ Rg 。

A = 278：²⁷⁸ Mt，²⁷⁸ Rg和²⁷⁸ Nh是实验确定的A = 278的核素。从最初观察到的链到²⁷⁸ Bh和²⁷⁸ Hs提供了非常初步的证据，到1999Og10分配给²⁸⁹ Fl，后来由2004Og10分配给²⁹⁰ Fl，并在2016Ho09进一步详细讨论，其中基于α衰变的系统和SF半衰期，建议²⁹⁰ Fl通过ε模式衰减至²⁹⁰ Nh，然后通过α链衰减，最终以²⁷⁸SF模式衰减的Bh。实验在FLNR-JINR-杜布纳协同在美国，GSI-SHIP设施LLNL和ORNL实验室进行，RIKEN：²⁷⁸从衰变山^294个TS在六个相关衰变链在杜布纳和GSI，²⁷⁸ RG制造在杜布纳观察到的两个相关衰变链中的²⁸² Nh的α子代，在RIKEN的三个相关衰变链中直接产生²⁷⁸ Nh。

A = 282：²⁸² Rg，²⁸² Cn和²⁸² Nh是实验确定的A = 282的核素。提供了一个非常初步的证据，来自最初观察到的链中的²⁸² Mt和²⁸² Ds，最初由1999Og10分配给²⁸⁹ Fl，后来由2004Og10分配给²⁹⁰ Fl，并在2016Ho09进行了详细讨论，其中基于α衰变的系统和SF半衰期，建议²⁹⁰ Fl通过ε模式衰减至²⁹⁰ Nh，然后通过α链衰减，最终以²⁷⁸SF模式衰减的Bh。在FLNR-Dubna与美国LLNL和ORNL实验室合作进行的实验以及在GSI-SHIP设施中进行的实验证实，在Dubna和GSI的六个相关衰变链中，在²⁹⁴ Ts的α衰变链中鉴定了这些同位素²⁸² Rg。，²⁸²的C n四种方式产生在杜布纳：独立地在一个相关的衰变链，作为α的女儿²⁸⁶吕11支相关衰变链，作为α的孙女²⁹⁰在12支相关衰变链艹，作为α的大-孙女四个相关的衰变链中的²⁹⁴ Og，和²⁸²Nh在杜布纳直接在两个相关的衰变链中产生。

A = 286：²⁸⁶ Nh和²⁸⁶ F1是仅有的实验确定的A = 286的核素。从最初观察到的链到²⁸⁶ Rg和²⁸⁶ Cn提供了非常初步的证据，到1999Og10分配给²⁸⁹ Fl，后来由2004Og10分配给²⁹⁰ Fl，到2016Ho09进一步详细讨论，其中基于α衰变的系统和SF半衰期，建议²⁹⁰ Fl通过ε模式衰减至²⁹⁰ Nh，然后通过α链衰减，最终以²⁷⁸SF模式衰减的Bh。2017Ka66在RIKEN的实验中使用GARIS分离器以三种不同方式解释了一条相关的衰变链，一种涉及在²⁴⁸ Cm（⁴⁸ Ca，2n）中可能产生²⁹⁴ Lv ，E = 261.6 MeV，而α衰变至²⁹⁰ Fl，进一步衰变为²⁸⁶人民币 在FLNR-Dubna与美国LLNL和ORNL实验室合作以及在GSI-SHIP设施上进行的实验证实了这些同位素的鉴定，在六个相关的衰变链中，²⁸⁶ Nh是²⁹⁴ Ts的α孙女，²⁸⁶ F1以三种方式产生：独立地在11个相关的衰变链中12条相关的衰变链中的²⁹⁰ Lv的α子代，四个相关的衰变链中的²⁹⁴ Og的α的孙女。

A = 290：²⁹⁰ Mc和²⁹⁰ Lv是仅有的实验确定的A = 290的核素。从最初观察到的链中给出了²⁹⁰ Nh和²⁹⁰ Fl的初步证据，到1999Og10分配给²⁸⁹ Fl，后来由2004Og10分配给²⁹⁰ Fl，并在2016Ho09进一步详细讨论，其中基于α衰变和SF半衰期为²⁹⁰ Fl，建议通过ε模式衰减至²⁹⁰ Nh，然后通过α链衰减，最终以²⁷⁸SF模式衰减的Bh。2017年Ka66在RIKEN的实验中使用GARIS分离器以三种不同方式解释了一条相关的衰变链，一种涉及在²⁴⁸ Cm（⁴⁸ Ca，2n）中可能产生²⁹⁴ Lv ，E = 261.6 MeV，而α衰变至²⁹⁰ Fl。在FLNR-Dubna与美国LLNL和ORNL实验室合作以及在GSI-SHIP设施上进行的实验证实了这些同位素的鉴定，其中²⁹⁰ Mc为6条相关衰变链中²⁹⁴ Ts的α子代，产生了²⁹⁰ Lv有两种方式，分别在14条相关的衰变链中，并作为^294的α子Og在四个相关的衰变链中。

A = 294：²⁹⁴ Ts和²⁹⁴ Og是仅有的实验确定的A = 294的核素。在FLNR-Dubna与美国LLNL和ORNL实验室合作进行的实验以及在GSI-SHIP设施上进行的实验证实了这些同位素的鉴定，总共观察到6条与EVR- α- SF相关的衰变链，共计²⁹⁴ Ts。四个为^294克。到2017Ka66为止，利用GARIS-RIKEN设施从一个相关事件的观测值中初步鉴定了²⁹⁴ Lv，该事件以三种可能的方式解释，两种解释导致产生²⁹³ Lv和连续的奇A核素^289。FL，²⁸⁵ Cn与^281个DS，而第三预测与生产开始²⁹⁴ Lv和连续²⁹⁰ F1和²⁸⁶的C n核素。搜索²⁹⁴ RG在天然金材料（2011De03），以及用于^294个DS，²⁹⁴ F1和²⁹⁴了Mc天然的Pt，Pb和Bi样品中（2011De21）使用加速器质谱（AMS）被证明负，既定极低上限。同样，使用AMS在1980Pt5的天然Pt样品中也没有发现²⁹⁴ Ds的任何证据。

甲= 298：搜索²⁹⁸ 120通过在杜布纳熔合蒸发反应，以及用于²⁹⁸ F1和²⁹⁸了Mc使用加速器质谱（AMS）被证明负天然的Pt，Pb和Bi样品英寸 2017He11驳回了2016Ho09到GSI ²⁴⁸ Cm（⁵⁴ Cr，3n）²⁹⁹ 120中三个α - α - α衰变链的暂定分配到²⁹⁹ 120的假设，2017He11反驳了，而是将这些相关性分配给了随机事件。

甲= 302：从Z = 120元素荧光X射线通过2012Fr03观察到复合核³⁰²中制备120 ²³⁸ U（⁶⁴测定的Ni，X）在GANIL，E = 6.6兆电子伏/核子，和x射线的产率，一起根据X射线多重性得出的平均时间最短。复合核可以通过3N-或4N通道衰减，以产生²⁹⁹ 120或²⁹⁸ 120 2012He05和2016Ho09也产生^302个120化合物在核²⁴⁸厘米（⁵⁴的Cr，xn）映射³⁰² 120 ^*，E = 6.035兆电子伏/核子; 和²³⁸ U（⁶⁴的Ni，xn）映射³⁰² 120^*，E ＝ 5.53MeV /核子反应，使用UNILAC在GSI。三个α - α - α从相关衰变²⁴⁸厘米（⁵⁴的Cr，xn）映射³⁰² 120 ^*反应中暂时由2016Ho09分配给²⁹⁹ 120衰减，但是，通过2017He11详细分析反驳该权利要求，归咎于这些事件随机序列。没有用于A = 302的数据表。