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{"title":"发现新元素:用 50Ti 生产鉝(Z=116)","authors":"J. M. Gates et al.","doi":"10.1103/physrevlett.133.172502","DOIUrl":null,"url":null,"abstract":"<p>The <sup>244</sup>Pu(<sup>50</sup>Ti,<em>xn</em>)<sup>294−x</sup>Lv reaction was investigated at Lawrence Berkeley National Laboratory's 88-Inch Cyclotron. The experiment was aimed at the production of a superheavy element with Z≥114 by irradiating an actinide target with a beam heavier than <sup>48</sup>Ca. Produced Lv ions were separated from the unwanted beam and nuclear reaction products using the Berkeley Gas-filled Separator and implanted into a newly commissioned focal plane detector system. Two decay chains were observed and assigned to the decay of <sup>290</sup>Lv. The production cross section was measured to be <span style=\"color: rgb(34, 34, 34); font-family: "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif; font-size: 14px; text-wrap: wrap; background-color: rgb(255, 255, 255);\"> </span><mjx-container class=\"MathJax CtxtMenu_Attached_0\" jax=\"CHTML\" overflow=\"linebreak\" sre-explorer-id=\"39\" tabindex=\"0\" role=\"tree\" ctxtmenu_oldtabindex=\"1\" ctxtmenu_counter=\"39\" style=\"box-sizing: border-box; color: rgb(34, 34, 34); font-family: "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif; background-color: rgb(255, 255, 255); font-size: 13.846px;\"><mjx-math data-semantic-structure=\"(22 (18 (2 0 1) 3 4) (13 (12 5 (8 6 7)) (11 9 10)) 14 (21 15 16 17))\" class=\"STX-N\" style=\"box-sizing: border-box; display: inline-block; line-height: 0; font-size: 13.846px; font-size-adjust: none; overflow-wrap: normal; word-spacing: normal; direction: ltr; padding: 1px 0px; font-family: MJX-STX-ZERO, MJX-STX-N;\"><mjx-mrow data-semantic-type=\"punctuated\" data-semantic-role=\"sequence\" data-semantic-id=\"22\" data-semantic-children=\"18,13,14,21\" data-semantic-content=\"13,14\" data-semantic-owns=\"18 13 14 21\" data-semantic-speech=\"sigma Subscript p r o d Baseline equals 0.44 left parenthesis Subscript negative 0.28 Superscript plus 0.58 Baseline right parenthesis p b\" style=\"box-sizing: border-box; display: inline-block;\"><mjx-mrow data-semantic-added=\"true\" data-semantic-type=\"relseq\" data-semantic-role=\"equality\" data-semantic-id=\"18\" data-semantic-children=\"2,4\" data-semantic-content=\"3\" data-semantic-parent=\"22\" data-semantic-owns=\"2 3 4\" style=\"box-sizing: border-box; display: inline-block;\"><mjx-msub data-semantic-type=\"subscript\" data-semantic-role=\"greekletter\" data-semantic-id=\"2\" data-semantic-children=\"0,1\" data-semantic-parent=\"18\" data-semantic-owns=\"0 1\" style=\"box-sizing: border-box; display: inline-block;\"><mjx-mrow style=\"box-sizing: border-box; display: inline-block;\"><mjx-mi data-semantic-type=\"identifier\" data-semantic-role=\"greekletter\" data-semantic-font=\"italic\" data-semantic-annotation=\"clearspeak:simple\" data-semantic-id=\"0\" data-semantic-parent=\"2\" style=\"box-sizing: border-box; display: inline-block;\"><mjx-c class=\"mjx-c1D70E\" style=\"box-sizing: border-box; display: inline-block; width: 0px; text-align: right; padding: 0.473em 0.57em 0.014em 0px;\">𝜎</mjx-c></mjx-mi></mjx-mrow><mjx-script style=\"box-sizing: border-box; display: inline-block; padding-right: 0.05em; padding-left: 0.033em; vertical-align: -0.15em;\"><mjx-mrow size=\"s\" style=\"box-sizing: border-box; display: inline-block; font-size: 9.78912px;\"><mjx-mi data-semantic-type=\"identifier\" data-semantic-role=\"unknown\" data-semantic-font=\"normal\" data-semantic-id=\"1\" data-semantic-parent=\"2\" style=\"box-sizing: border-box; display: inline-block;\"><mjx-c class=\"mjx-c70\" noic=\"true\" style=\"box-sizing: border-box; display: inline-block; width: 0px; text-align: right; padding: 0.706em 0.537em 0.22em 0px;\">p</mjx-c><mjx-c class=\"mjx-c72\" noic=\"true\" style=\"box-sizing: border-box; display: inline-block; width: 0px; text-align: right; padding: 0.706em 0.38em 0px 0px;\">r</mjx-c><mjx-c class=\"mjx-c6F\" noic=\"true\" style=\"box-sizing: border-box; display: inline-block; width: 0px; text-align: right; padding: 0.706em 0.514em 0.01em 0px;\">o</mjx-c><mjx-c class=\"mjx-c64\" style=\"box-sizing: border-box; display: inline-block; width: 0px; text-align: right; padding: 0.706em 0.539em 0.008em 0px;\">d</mjx-c></mjx-mi></mjx-mrow></mjx-script></mjx-msub><mjx-mo space=\"4\" data-semantic-type=\"relation\" data-semantic-role=\"equality\" data-semantic-id=\"3\" data-semantic-parent=\"18\" data-semantic-operator=\"relseq,=\" style=\"box-sizing: border-box; display: inline-block; margin-left: 0.278em;\"><mjx-c class=\"mjx-c3D\" style=\"box-sizing: border-box; display: inline-block; width: 0px; text-align: right; padding: 0.395em 0.72em 0px 0px;\">=</mjx-c></mjx-mo><mjx-mn space=\"4\" data-semantic-type=\"number\" data-semantic-role=\"float\" data-semantic-font=\"normal\" data-semantic-annotation=\"clearspeak:simple\" data-semantic-id=\"4\" data-semantic-parent=\"18\" style=\"box-sizing: border-box; display: inline-block; margin-left: 0.278em;\"><mjx-c class=\"mjx-c30\" noic=\"true\" style=\"box-sizing: border-box; display: inline-block; width: 0px; text-align: right; padding: 0.645em 0.495em 0.011em 0px;\">0</mjx-c><mjx-c class=\"mjx-c2E\" noic=\"true\" style=\"box-sizing: border-box; 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display: inline-block; vertical-align: -0.02em;\"><mjx-c class=\"mjx-c28\" style=\"box-sizing: border-box; display: inline-block; width: 0px; text-align: right; padding: 0.736em 0.357em 0.196em 0px;\">(</mjx-c></mjx-mo></mjx-mrow><mjx-script style=\"box-sizing: border-box; display: inline-block; padding-right: 0.05em; padding-left: 0.033em; vertical-align: -0.278em; margin-left: 0px;\"><mjx-mrow size=\"s\" data-semantic-type=\"prefixop\" data-semantic-role=\"positive\" data-semantic-id=\"11\" data-semantic-children=\"10\" data-semantic-content=\"9\" data-semantic-parent=\"13\" data-semantic-owns=\"9 10\" style=\"box-sizing: border-box; display: inline-block; font-size: 9.78912px;\"><mjx-mo data-semantic-type=\"operator\" data-semantic-role=\"addition\" data-semantic-id=\"9\" data-semantic-parent=\"11\" data-semantic-operator=\"prefixop,+\" style=\"box-sizing: border-box; display: inline-block;\"><mjx-c class=\"mjx-c2B\" style=\"box-sizing: border-box; display: inline-block; width: 0px; 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display: block; margin-top: 0.204em;\"></mjx-spacer><mjx-mrow size=\"s\" data-semantic-type=\"prefixop\" data-semantic-role=\"negative\" data-semantic-annotation=\"clearspeak:simple\" data-semantic-id=\"8\" data-semantic-children=\"7\" data-semantic-content=\"6\" data-semantic-parent=\"13\" data-semantic-owns=\"6 7\" style=\"box-sizing: border-box; display: inline-block; font-size: 9.78912px;\"><mjx-mo data-semantic-type=\"operator\" data-semantic-role=\"subtraction\" data-semantic-id=\"6\" data-semantic-parent=\"8\" data-semantic-operator=\"prefixop,−\" style=\"box-sizing: border-box; display: inline-block;\"><mjx-c class=\"mjx-c2212\" style=\"box-sizing: border-box; display: inline-block; width: 0px; text-align: right; padding: 0.558em 0.72em 0.04em 0px;\">−</mjx-c></mjx-mo><mjx-mn data-semantic-type=\"number\" data-semantic-role=\"float\" data-semantic-font=\"normal\" data-semantic-annotation=\"clearspeak:simple\" data-semantic-id=\"7\" data-semantic-parent=\"8\" style=\"box-sizing: border-box; display: inline-block;\"><mjx-c class=\"mjx-c30\" noic=\"true\" style=\"box-sizing: border-box; display: inline-block; width: 0px; text-align: right; padding: 0.647em 0.495em 0.011em 0px;\">0</mjx-c><mjx-c class=\"mjx-c2E\" noic=\"true\" style=\"box-sizing: border-box; display: inline-block; width: 0px; text-align: right; padding: 0.647em 0.245em 0.008em 0px;\">.</mjx-c><mjx-c class=\"mjx-c32\" noic=\"true\" style=\"box-sizing: border-box; display: inline-block; width: 0px; text-align: right; padding: 0.647em 0.495em 0px 0px;\">2</mjx-c><mjx-c class=\"mjx-c38\" style=\"box-sizing: border-box; display: inline-block; width: 0px; text-align: right; padding: 0.647em 0.495em 0.012em 0px;\">8</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msubsup><mjx-mo data-semantic-type=\"punctuation\" data-semantic-role=\"closefence\" data-semantic-id=\"14\" data-semantic-parent=\"22\" data-semantic-operator=\"punctuated\" style=\"box-sizing: border-box; display: inline-block; vertical-align: -0.02em;\"><mjx-c class=\"mjx-c29\" style=\"box-sizing: border-box; display: inline-block; width: 0px; text-align: right; padding: 0.736em 0.357em 0.196em 0px;\">)</mjx-c></mjx-mo><mjx-mrow data-semantic-added=\"true\" data-semantic-type=\"punctuated\" data-semantic-role=\"text\" data-semantic-id=\"21\" data-semantic-children=\"15,16,17\" data-semantic-parent=\"22\" data-semantic-collapsed=\"(21 (c 19 20) 15 16 17)\" data-semantic-owns=\"15 16 17\" style=\"box-sizing: border-box; display: inline-block;\"><mjx-mtext data-semantic-type=\"text\" data-semantic-role=\"space\" data-semantic-annotation=\"clearspeak:unit\" data-semantic-id=\"15\" data-semantic-parent=\"21\" style=\"box-sizing: border-box; display: inline-block; font-family: MJX-STX-ZERO, "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif;\"><mjx-utext variant=\"-explicitFont\" style=\"box-sizing: border-box; display: inline-block; padding: 0.813em 0px 0.217em; font-size: 12.7799px; width: 3px;\"> </mjx-utext></mjx-mtext><mjx-mtext data-semantic-type=\"text\" data-semantic-role=\"space\" data-semantic-annotation=\"clearspeak:unit\" data-semantic-id=\"16\" data-semantic-parent=\"21\" style=\"box-sizing: border-box; display: inline-block; font-family: MJX-STX-ZERO, "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif;\"><mjx-utext variant=\"-explicitFont\" style=\"box-sizing: border-box; display: inline-block; padding: 0.813em 0px 0.217em; font-size: 12.7799px; width: 3px;\"> </mjx-utext></mjx-mtext></mjx-mrow></mjx-mrow></mjx-math></mjx-container>pb at a center-of-target center-of-mass energy of 220(3)~MeV. This represents the first published measurement of the production of a superheavy element near the `Island-of-Stability’, with a beam of <sup>50</sup>Ti and is an essential precursor in the pursuit of searching for new elements beyond Z=118.</p>","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":null,"pages":null},"PeriodicalIF":8.1000,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Towards the discovery of new elements: Production of livermorium (Z=116) with 50Ti\",\"authors\":\"J. M. Gates et al.\",\"doi\":\"10.1103/physrevlett.133.172502\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The <sup>244</sup>Pu(<sup>50</sup>Ti,<em>xn</em>)<sup>294−x</sup>Lv reaction was investigated at Lawrence Berkeley National Laboratory's 88-Inch Cyclotron. The experiment was aimed at the production of a superheavy element with Z≥114 by irradiating an actinide target with a beam heavier than <sup>48</sup>Ca. Produced Lv ions were separated from the unwanted beam and nuclear reaction products using the Berkeley Gas-filled Separator and implanted into a newly commissioned focal plane detector system. Two decay chains were observed and assigned to the decay of <sup>290</sup>Lv. The production cross section was measured to be <span style=\\\"color: rgb(34, 34, 34); font-family: "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif; font-size: 14px; text-wrap: wrap; background-color: rgb(255, 255, 255);\\\"> </span><mjx-container class=\\\"MathJax CtxtMenu_Attached_0\\\" jax=\\\"CHTML\\\" overflow=\\\"linebreak\\\" sre-explorer-id=\\\"39\\\" tabindex=\\\"0\\\" role=\\\"tree\\\" ctxtmenu_oldtabindex=\\\"1\\\" ctxtmenu_counter=\\\"39\\\" style=\\\"box-sizing: border-box; color: rgb(34, 34, 34); font-family: "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif; background-color: rgb(255, 255, 255); font-size: 13.846px;\\\"><mjx-math data-semantic-structure=\\\"(22 (18 (2 0 1) 3 4) (13 (12 5 (8 6 7)) (11 9 10)) 14 (21 15 16 17))\\\" class=\\\"STX-N\\\" style=\\\"box-sizing: border-box; display: inline-block; line-height: 0; font-size: 13.846px; font-size-adjust: none; overflow-wrap: normal; word-spacing: normal; direction: ltr; padding: 1px 0px; font-family: MJX-STX-ZERO, MJX-STX-N;\\\"><mjx-mrow data-semantic-type=\\\"punctuated\\\" data-semantic-role=\\\"sequence\\\" data-semantic-id=\\\"22\\\" data-semantic-children=\\\"18,13,14,21\\\" data-semantic-content=\\\"13,14\\\" data-semantic-owns=\\\"18 13 14 21\\\" data-semantic-speech=\\\"sigma Subscript p r o d Baseline equals 0.44 left parenthesis Subscript negative 0.28 Superscript plus 0.58 Baseline right parenthesis p b\\\" style=\\\"box-sizing: border-box; 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display: inline-block; font-family: MJX-STX-ZERO, "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif;\\\"><mjx-utext variant=\\\"-explicitFont\\\" style=\\\"box-sizing: border-box; display: inline-block; padding: 0.813em 0px 0.217em; font-size: 12.7799px; width: 3px;\\\"> </mjx-utext></mjx-mtext><mjx-mtext data-semantic-type=\\\"text\\\" data-semantic-role=\\\"space\\\" data-semantic-annotation=\\\"clearspeak:unit\\\" data-semantic-id=\\\"16\\\" data-semantic-parent=\\\"21\\\" style=\\\"box-sizing: border-box; display: inline-block; font-family: MJX-STX-ZERO, "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif;\\\"><mjx-utext variant=\\\"-explicitFont\\\" style=\\\"box-sizing: border-box; display: inline-block; padding: 0.813em 0px 0.217em; font-size: 12.7799px; width: 3px;\\\"> </mjx-utext></mjx-mtext></mjx-mrow></mjx-mrow></mjx-math></mjx-container>pb at a center-of-target center-of-mass energy of 220(3)~MeV. This represents the first published measurement of the production of a superheavy element near the `Island-of-Stability’, with a beam of <sup>50</sup>Ti and is an essential precursor in the pursuit of searching for new elements beyond Z=118.</p>\",\"PeriodicalId\":20069,\"journal\":{\"name\":\"Physical review letters\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":8.1000,\"publicationDate\":\"2024-10-21\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physical review letters\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://doi.org/10.1103/physrevlett.133.172502\",\"RegionNum\":1,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"PHYSICS, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physical review letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1103/physrevlett.133.172502","RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
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