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id="toc-Deformed_nuclei-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Predicted_decay_properties" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Predicted_decay_properties"> <div class="vector-toc-text"> 3 Predicted decay properties </div> </a> <ul id="toc-Predicted_decay_properties-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Possible_natural_occurrence" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Possible_natural_occurrence"> <div class="vector-toc-text"> 4 Possible natural occurrence </div> </a> <ul id="toc-Possible_natural_occurrence-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Synthesis_and_difficulties" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Synthesis_and_difficulties"> <div class="vector-toc-text"> 5 Synthesis and difficulties </div> </a> <ul id="toc-Synthesis_and_difficulties-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Other_islands_of_stability" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Other_islands_of_stability"> <div class="vector-toc-text"> 6 Other islands of stability </div> </a> <ul id="toc-Other_islands_of_stability-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> 7 See also </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Notes" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Notes"> <div class="vector-toc-text"> 8 Notes </div> </a> <ul id="toc-Notes-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> 9 References </div> </a> <button aria-controls="toc-References-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> Toggle References subsection </button> <ul id="toc-References-sublist" class="vector-toc-list"> <li id="toc-Bibliography" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Bibliography"> <div class="vector-toc-text"> 9.1 Bibliography </div> </a> <ul id="toc-Bibliography-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> 10 External links </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" > Toggle the table of contents </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading">Island of stability</h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 29 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-29" aria-hidden="true" > 29 languages </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AC%D8%B2%D9%8A%D8%B1%D8%A9_%D8%A7%D9%84%D8%AB%D8%A8%D8%A7%D8%AA" title="جزيرة الثبات – Arabic" lang="ar" hreflang="ar" data-title="جزيرة الثبات" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target">العربية</a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9E%D1%81%D1%82%D1%80%D0%BE%D0%B2_%D0%BD%D0%B0_%D1%81%D1%82%D0%B0%D0%B1%D0%B8%D0%BB%D0%BD%D0%BE%D1%81%D1%82" title="Остров на стабилност – Bulgarian" lang="bg" hreflang="bg" data-title="Остров на стабилност" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target">Български</a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Illa_d%27estabilitat" title="Illa d'estabilitat – Catalan" lang="ca" hreflang="ca" data-title="Illa d'estabilitat" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target">Català</a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Ostrov_stability" title="Ostrov stability – Czech" lang="cs" hreflang="cs" data-title="Ostrov stability" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target">Čeština</a></li><li class="interlanguage-link interwiki-de badge-Q70894304 mw-list-item" title=""><a href="https://de.wikipedia.org/wiki/Insel_der_Stabilit%C3%A4t" title="Insel der Stabilität – German" lang="de" hreflang="de" data-title="Insel der Stabilität" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target">Deutsch</a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Isla_de_estabilidad" title="Isla de estabilidad – Spanish" lang="es" hreflang="es" data-title="Isla de estabilidad" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target">Español</a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Egonkortasun_uhartea" title="Egonkortasun uhartea – Basque" lang="eu" hreflang="eu" data-title="Egonkortasun uhartea" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target">Euskara</a></li><li class="interlanguage-link interwiki-fa badge-Q17437798 badge-goodarticle mw-list-item" title="good article badge"><a href="https://fa.wikipedia.org/wiki/%D8%AC%D8%B2%DB%8C%D8%B1%D9%87_%D9%BE%D8%A7%DB%8C%D8%AF%D8%A7%D8%B1%DB%8C" title="جزیره پایداری – Persian" lang="fa" hreflang="fa" data-title="جزیره پایداری" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target">فارسی</a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/%C3%8Elot_de_stabilit%C3%A9" title="Îlot de stabilité – French" lang="fr" hreflang="fr" data-title="Îlot de stabilité" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target">Français</a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Oile%C3%A1n_na_cobhsa%C3%ADochta" title="Oileán na cobhsaíochta – Irish" lang="ga" hreflang="ga" data-title="Oileán na cobhsaíochta" data-language-autonym="Gaeilge" data-language-local-name="Irish" class="interlanguage-link-target">Gaeilge</a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%95%88%EC%A0%95%EC%84%B1%EC%9D%98_%EC%84%AC" title="안정성의 섬 – Korean" lang="ko" hreflang="ko" data-title="안정성의 섬" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target">한국어</a></li><li class="interlanguage-link interwiki-id badge-Q17437796 badge-featuredarticle mw-list-item" title="featured article badge"><a href="https://id.wikipedia.org/wiki/Pulau_kestabilan_nuklir" title="Pulau kestabilan nuklir – Indonesian" lang="id" hreflang="id" data-title="Pulau kestabilan nuklir" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target">Bahasa Indonesia</a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Isola_di_stabilit%C3%A0" title="Isola di stabilità – Italian" lang="it" hreflang="it" data-title="Isola di stabilità" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target">Italiano</a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%90%D7%99_%D7%A9%D7%9C_%D7%99%D7%A6%D7%99%D7%91%D7%95%D7%AA" title="אי של יציבות – Hebrew" lang="he" hreflang="he" data-title="אי של יציבות" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target">עברית</a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Pulau_kestabilan" title="Pulau kestabilan – Malay" lang="ms" hreflang="ms" data-title="Pulau kestabilan" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target">Bahasa Melayu</a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%AE%89%E5%AE%9A%E3%81%AE%E5%B3%B6" title="安定の島 – Japanese" lang="ja" hreflang="ja" data-title="安定の島" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target">日本語</a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Wyspa_stabilno%C5%9Bci" title="Wyspa stabilności – Polish" lang="pl" hreflang="pl" data-title="Wyspa stabilności" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target">Polski</a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Ilha_de_estabilidade" title="Ilha de estabilidade – Portuguese" lang="pt" hreflang="pt" data-title="Ilha de estabilidade" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target">Português</a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9E%D1%81%D1%82%D1%80%D0%BE%D0%B2_%D1%81%D1%82%D0%B0%D0%B1%D0%B8%D0%BB%D1%8C%D0%BD%D0%BE%D1%81%D1%82%D0%B8" title="Остров стабильности – Russian" lang="ru" hreflang="ru" data-title="Остров стабильности" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target">Русский</a></li><li class="interlanguage-link interwiki-stq mw-list-item"><a href="https://stq.wikipedia.org/wiki/Ailound_fon_ju_Stabilit%C3%A4t" title="Ailound fon ju Stabilität – Saterland Frisian" lang="stq" hreflang="stq" data-title="Ailound fon ju Stabilität" data-language-autonym="Seeltersk" data-language-local-name="Saterland Frisian" class="interlanguage-link-target">Seeltersk</a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Island_of_stability" title="Island of stability – Simple English" lang="en-simple" hreflang="en-simple" data-title="Island of stability" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target">Simple English</a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Ostrov_stability" title="Ostrov stability – Slovak" lang="sk" hreflang="sk" data-title="Ostrov stability" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target">Slovenčina</a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Stabiilisuuden_saari" title="Stabiilisuuden saari – Finnish" lang="fi" hreflang="fi" data-title="Stabiilisuuden saari" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target">Suomi</a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%AB%E0%B8%A1%E0%B8%B9%E0%B9%88%E0%B9%80%E0%B8%81%E0%B8%B2%E0%B8%B0%E0%B9%81%E0%B8%AB%E0%B9%88%E0%B8%87%E0%B9%80%E0%B8%AA%E0%B8%96%E0%B8%B5%E0%B8%A2%E0%B8%A3%E0%B8%A0%E0%B8%B2%E0%B8%9E" title="หมู่เกาะแห่งเสถียรภาพ – Thai" lang="th" hreflang="th" data-title="หมู่เกาะแห่งเสถียรภาพ" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target">ไทย</a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Kararl%C4%B1l%C4%B1k_adas%C4%B1" title="Kararlılık adası – Turkish" lang="tr" hreflang="tr" data-title="Kararlılık adası" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target">Türkçe</a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9E%D1%81%D1%82%D1%80%D1%96%D0%B2_%D1%81%D1%82%D0%B0%D0%B1%D1%96%D0%BB%D1%8C%D0%BD%D0%BE%D1%81%D1%82%D1%96" title="Острів стабільності – Ukrainian" lang="uk" hreflang="uk" data-title="Острів стабільності" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target">Українська</a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a 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Click here for more information."><img alt="Featured article" src="//upload.wikimedia.org/wikipedia/en/thumb/e/e7/Cscr-featured.svg/20px-Cscr-featured.svg.png" decoding="async" width="20" height="19" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/e/e7/Cscr-featured.svg/30px-Cscr-featured.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/e/e7/Cscr-featured.svg/40px-Cscr-featured.svg.png 2x" data-file-width="466" data-file-height="443" /></a></div></div> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Predicted set of isotopes of relatively more stable superheavy elements</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">For the speech by Jimmy Carter, see <a href="/wiki/Island_of_Stability_(speech)" title="Island of Stability (speech)">Island of Stability (speech)</a>.</div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Island_of_Stability_derived_from_Zagrebaev.svg" class="mw-file-description"><img alt="A diagram showing the measured and predicted half-lives of heavy and superheavy nuclides, as well as the beta stability line and predicted location of the island of stability." src="//upload.wikimedia.org/wikipedia/commons/thumb/8/89/Island_of_Stability_derived_from_Zagrebaev.svg/530px-Island_of_Stability_derived_from_Zagrebaev.svg.png" decoding="async" width="530" height="257" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/89/Island_of_Stability_derived_from_Zagrebaev.svg/795px-Island_of_Stability_derived_from_Zagrebaev.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/89/Island_of_Stability_derived_from_Zagrebaev.svg/1060px-Island_of_Stability_derived_from_Zagrebaev.svg.png 2x" data-file-width="1155" data-file-height="560" /></a><figcaption>A diagram by the <a href="/wiki/Joint_Institute_for_Nuclear_Research" title="Joint Institute for Nuclear Research">Joint Institute for Nuclear Research</a> showing the measured (boxed) and predicted <a href="/wiki/Half-lives" class="mw-redirect" title="Half-lives">half-lives</a> of superheavy <a href="/wiki/Nuclides" class="mw-redirect" title="Nuclides">nuclides</a>, ordered by number of protons and neutrons. The expected location of the island of stability around Z = 112 (<a href="/wiki/Copernicium" title="Copernicium">copernicium</a>) is circled.<a href="#cite_note-ZagrebaevPPT-1">[1]</a><a href="#cite_note-KarpovSHE-2">[2]</a></figcaption></figure> In <a href="/wiki/Nuclear_physics" title="Nuclear physics">nuclear physics</a>, the island of stability is a predicted set of <a href="/wiki/Isotope" title="Isotope">isotopes</a> of <a href="/wiki/Superheavy_element" title="Superheavy element">superheavy elements</a> that may have considerably longer <a href="/wiki/Half-lives" class="mw-redirect" title="Half-lives">half-lives</a> than known isotopes of these elements. It is predicted to appear as an "island" in the <a href="/wiki/Chart_of_nuclides" class="mw-redirect" title="Chart of nuclides">chart of nuclides</a>, separated from known <a href="/wiki/Stable_nuclide" title="Stable nuclide">stable</a> and long-lived <a href="/wiki/Primordial_radionuclide" class="mw-redirect" title="Primordial radionuclide">primordial radionuclides</a>. Its theoretical existence is attributed to stabilizing effects of predicted "<a href="/wiki/Magic_number_(physics)" title="Magic number (physics)">magic numbers</a>" of <a href="/wiki/Proton" title="Proton">protons</a> and <a href="/wiki/Neutron" title="Neutron">neutrons</a> in the superheavy mass region.<a href="#cite_note-3">[3]</a><a href="#cite_note-NYT-20190827-4">[4]</a> <style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul 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a{color:var(--color-progressive)!important}}@media print{body.ns-0 .mw-parser-output .sidebar{display:none!important}}</style><table class="sidebar sidebar-collapse nomobile nowraplinks"><tbody><tr><th class="sidebar-title"><a href="/wiki/Nuclear_physics" title="Nuclear physics">Nuclear physics</a></th></tr><tr><td class="sidebar-image"><a href="/wiki/File:NuclearReaction.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4b/NuclearReaction.svg/200px-NuclearReaction.svg.png" decoding="async" width="200" height="127" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4b/NuclearReaction.svg/300px-NuclearReaction.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4b/NuclearReaction.svg/400px-NuclearReaction.svg.png 2x" data-file-width="550" data-file-height="350" /></a></td></tr><tr><td class="sidebar-content hlist"> <ul><li><a href="/wiki/Atomic_nucleus" title="Atomic nucleus">Nucleus</a></li> <li><a href="/wiki/Nucleon" title="Nucleon">Nucleons</a> <ul><li><a href="/wiki/Proton" title="Proton">p</a></li> <li><a href="/wiki/Neutron" title="Neutron">n</a></li></ul></li> <li><a href="/wiki/Nuclear_matter" title="Nuclear matter">Nuclear matter</a></li> <li><a href="/wiki/Nuclear_force" title="Nuclear force">Nuclear force</a></li> <li><a href="/wiki/Nuclear_structure" title="Nuclear structure">Nuclear structure</a></li> <li><a href="/wiki/Nuclear_reaction" title="Nuclear reaction">Nuclear reaction</a></li></ul></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)"><a href="/wiki/Nuclear_model" class="mw-redirect" title="Nuclear model">Models of the nucleus</a></div><div class="sidebar-list-content mw-collapsible-content"> <ul><li><a href="/wiki/Semi-empirical_mass_formula" title="Semi-empirical mass formula">Liquid drop</a></li> <li><a href="/wiki/Nuclear_shell_model" title="Nuclear shell model">Nuclear shell model</a></li> <li><a href="/wiki/Interacting_boson_model" title="Interacting boson model">Interacting boson model</a></li> <li><a href="/wiki/Ab_initio_methods_(nuclear_physics)" title="Ab initio methods (nuclear physics)">Ab initio</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)"><a href="/wiki/Nuclide" title="Nuclide">Nuclides</a>' classification</div><div class="sidebar-list-content mw-collapsible-content"> <ul><li><a href="/wiki/Isotope" title="Isotope">Isotopes</a> – equal <a href="/wiki/Atomic_number" title="Atomic number">Z</a> </li></ul> <ul><li><a href="/wiki/Isobar_(nuclide)" title="Isobar (nuclide)">Isobars</a> – equal <a href="/wiki/Mass_number" title="Mass number">A</a></li></ul> <ul><li><a href="/wiki/Isotone" title="Isotone">Isotones</a> – equal <a href="/wiki/Neutron_number" title="Neutron number">N</a></li></ul> <ul><li><a href="/wiki/Isodiapher" class="mw-redirect" title="Isodiapher">Isodiaphers</a> – equal <a href="/wiki/Neutron_excess" class="mw-redirect" title="Neutron excess">N − Z</a></li></ul> <ul><li><a href="/wiki/Nuclear_isomer" title="Nuclear isomer">Isomers</a> – equal all the above</li></ul> <ul><li><a href="/wiki/Mirror_nuclei" title="Mirror nuclei">Mirror nuclei</a> – Z ↔ N</li></ul> <ul><li><a href="/wiki/Stable_isotope" class="mw-redirect" title="Stable isotope">Stable</a></li> <li><a href="/wiki/Magic_number_(physics)" title="Magic number (physics)">Magic</a></li> <li><a href="/wiki/Even_and_odd_atomic_nuclei" title="Even and odd atomic nuclei">Even/odd</a></li> <li><a href="/wiki/Halo_nucleus" title="Halo nucleus">Halo</a> <ul><li><a href="/wiki/Borromean_nucleus" title="Borromean nucleus">Borromean</a></li></ul></li></ul></div></div></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)">Nuclear stability</div><div class="sidebar-list-content mw-collapsible-content"> <ul><li><a href="/wiki/Nuclear_binding_energy" title="Nuclear binding energy">Binding energy</a></li> <li><a href="/wiki/Proton%E2%80%93neutron_ratio" class="mw-redirect" title="Proton–neutron ratio">p–n ratio</a></li> <li><a href="/wiki/Nuclear_drip_line" title="Nuclear drip line">Drip line</a></li> <li><a class="mw-selflink selflink">Island of stability</a></li> <li><a href="/wiki/Valley_of_stability" title="Valley of stability">Valley of stability</a></li> <li><a href="/wiki/Stable_nuclide" title="Stable nuclide">Stable nuclide</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)"><a href="/wiki/Radioactive_decay" title="Radioactive decay">Radioactive decay</a></div><div class="sidebar-list-content mw-collapsible-content"> <ul><li><a href="/wiki/Alpha_decay" title="Alpha decay">Alpha α</a></li> <li><a href="/wiki/Beta_decay" title="Beta decay">Beta β</a> <ul><li><a href="/wiki/Double_beta_decay" title="Double beta decay">2β</a> <ul><li><a href="/wiki/Neutrinoless_double_beta_decay" title="Neutrinoless double beta decay">0v</a></li></ul></li> <li><a href="/wiki/Positron_emission" title="Positron emission">β+</a></li></ul></li> <li><a href="/wiki/Electron_capture" title="Electron capture">K/L capture</a></li> <li><a href="/wiki/Isomeric_transition" class="mw-redirect" title="Isomeric transition">Isomeric</a> <ul><li><a href="/wiki/Gamma_ray" title="Gamma ray">Gamma γ</a></li> <li><a href="/wiki/Internal_conversion" title="Internal conversion">Internal conversion</a></li></ul></li> <li><a href="/wiki/Spontaneous_fission" title="Spontaneous fission">Spontaneous fission</a></li> <li><a href="/wiki/Cluster_decay" title="Cluster decay">Cluster decay</a></li> <li><a href="/wiki/Neutron_emission" title="Neutron emission">Neutron emission</a></li> <li><a href="/wiki/Proton_emission" title="Proton emission">Proton emission</a></li></ul> <ul><li><a href="/wiki/Decay_energy" title="Decay energy">Decay energy</a></li> <li><a href="/wiki/Decay_chain" title="Decay chain">Decay chain</a></li> <li><a href="/wiki/Decay_product" title="Decay product">Decay product</a></li> <li><a href="/wiki/Radiogenic_nuclide" title="Radiogenic nuclide">Radiogenic nuclide</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)"><a href="/wiki/Nuclear_fission" title="Nuclear fission">Nuclear fission</a></div><div class="sidebar-list-content mw-collapsible-content"> <ul><li><a href="/wiki/Spontaneous_fission" title="Spontaneous fission">Spontaneous</a></li> <li><a href="/wiki/Nuclear_fission_product" title="Nuclear fission product">Products</a> <ul><li><a href="/wiki/Nucleon_pair_breaking_in_fission" title="Nucleon pair breaking in fission">pair breaking</a></li></ul></li> <li><a href="/wiki/Photofission" title="Photofission">Photofission</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)">Capturing processes</div><div class="sidebar-list-content mw-collapsible-content"> <ul><li><a href="/wiki/Electron_capture" title="Electron capture">electron</a> <ul><li><a href="/wiki/Double_electron_capture" title="Double electron capture">2×</a></li></ul></li> <li><a href="/wiki/Neutron_capture" title="Neutron capture">neutron</a> <ul><li><a href="/wiki/S-process" title="S-process">s</a></li> <li><a href="/wiki/R-process" title="R-process">r</a></li></ul></li> <li><a href="/wiki/Proton_capture" title="Proton capture">proton</a> <ul><li><a href="/wiki/P-process" title="P-process">p</a></li> <li><a href="/wiki/Rp-process" title="Rp-process">rp</a></li></ul></li></ul></div></div></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)">High-energy processes</div><div class="sidebar-list-content mw-collapsible-content"> <ul><li><a href="/wiki/Spallation" title="Spallation">Spallation</a> <ul><li><a href="/wiki/Cosmic_ray_spallation" title="Cosmic ray spallation">by cosmic ray</a></li></ul></li> <li><a href="/wiki/Photodisintegration" title="Photodisintegration">Photodisintegration</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)"><a href="/wiki/Nucleosynthesis" title="Nucleosynthesis">Nucleosynthesis</a> and <a href="/wiki/Nuclear_astrophysics" title="Nuclear astrophysics">nuclear astrophysics</a></div><div class="sidebar-list-content mw-collapsible-content"> <ul><li><a href="/wiki/Nuclear_fusion" title="Nuclear fusion">Nuclear fusion</a></li></ul> <ul><li>Processes: <ul><li><a href="/wiki/Stellar_nucleosynthesis" title="Stellar nucleosynthesis">Stellar</a></li> <li><a href="/wiki/Big_Bang_nucleosynthesis" title="Big Bang nucleosynthesis">Big Bang</a></li> <li><a href="/wiki/Supernova_nucleosynthesis" title="Supernova nucleosynthesis">Supernova</a></li></ul></li></ul> <ul><li>Nuclides: <ul><li><a href="/wiki/Primordial_nuclide" title="Primordial nuclide">Primordial</a></li> <li><a href="/wiki/Cosmogenic_nuclide" title="Cosmogenic nuclide">Cosmogenic</a></li> <li><a href="/wiki/Synthetic_element" title="Synthetic element">Artificial</a></li></ul></li></ul></div></div></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)"><a 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Bohr</a></li> <li><a href="/wiki/Niels_Bohr" title="Niels Bohr">N. Bohr</a></li> <li><a href="/wiki/James_Chadwick" title="James Chadwick">Chadwick</a></li> <li><a href="/wiki/John_Cockcroft" title="John Cockcroft">Cockcroft</a></li> <li><a href="/wiki/Ir%C3%A8ne_Joliot-Curie" title="Irène Joliot-Curie">Ir. Curie</a></li> <li><a href="/wiki/Fr%C3%A9d%C3%A9ric_Joliot-Curie" title="Frédéric Joliot-Curie">Fr. Curie</a></li> <li><a href="/wiki/Pierre_Curie" title="Pierre Curie">Pi. Curie</a></li> <li><a href="/wiki/Marie_Curie" title="Marie Curie">Skłodowska-Curie</a></li> <li><a href="/wiki/Clinton_Davisson" title="Clinton Davisson">Davisson</a></li> <li><a href="/wiki/Enrico_Fermi" title="Enrico Fermi">Fermi</a></li> <li><a href="/wiki/Otto_Hahn" title="Otto Hahn">Hahn</a></li> <li><a href="/wiki/J._Hans_D._Jensen" title="J. Hans D. 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Thomson">Thomson</a></li> <li><a href="/wiki/Ernest_Walton" title="Ernest Walton">Walton</a></li> <li><a href="/wiki/Eugene_Wigner" title="Eugene Wigner">Wigner</a></li></ul></div></div></td> </tr><tr><td class="sidebar-below hlist" style="background-color: transparent; border-color: #A2B8BF"> <ul><li><a href="/wiki/File:Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg" class="mw-file-description"><img alt="icon" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg/14px-Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg.png" decoding="async" width="14" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg/21px-Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg/28px-Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg.png 2x" data-file-width="530" data-file-height="600" /></a> <a href="/wiki/Portal:Physics" title="Portal:Physics">Physics portal</a></li> <li><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /> <a href="/wiki/Category:Nuclear_physics" title="Category:Nuclear physics">Category</a></li></ul></td></tr><tr><td class="sidebar-navbar"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Nuclear_physics" title="Template:Nuclear physics"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Nuclear_physics" title="Template talk:Nuclear physics"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Nuclear_physics" title="Special:EditPage/Template:Nuclear physics"><abbr title="Edit this template">e</abbr></a></li></ul></div></td></tr></tbody></table> Several predictions have been made regarding the exact location of the island of stability, though it is generally thought to center near <a href="/wiki/Copernicium" title="Copernicium">copernicium</a> and <a href="/wiki/Flerovium" title="Flerovium">flerovium</a> isotopes in the vicinity of the predicted closed neutron <a href="/wiki/Nuclear_shell_model" title="Nuclear shell model">shell</a> at N = 184.<a href="#cite_note-KarpovSHE-2">[2]</a> These models strongly suggest that the closed shell will confer further stability towards <a href="/wiki/Nuclear_fission" title="Nuclear fission">fission</a> and <a href="/wiki/Alpha_decay" title="Alpha decay">alpha decay</a>. While these effects are expected to be greatest near <a href="/wiki/Atomic_number" title="Atomic number">atomic number</a> Z = 114 (<a href="/wiki/Flerovium" title="Flerovium">flerovium</a>) and N = 184, the region of increased stability is expected to encompass several neighboring elements, and there may also be additional islands of stability around heavier nuclei that are <a href="/wiki/Doubly_magic" class="mw-redirect" title="Doubly magic">doubly magic</a> (having magic numbers of both protons and neutrons). Estimates of the stability of the nuclides within the island are usually around a half-life of minutes or days; some optimists propose half-lives on the order of millions of years.<a href="#cite_note-nuclei-5">[5]</a> Although the nuclear shell model predicting magic numbers has existed since the 1940s, the existence of long-lived superheavy nuclides has not been definitively demonstrated. Like the rest of the superheavy elements, the nuclides within the island of stability have never been found in nature; thus, they must be created artificially in a <a href="/wiki/Nuclear_reaction" title="Nuclear reaction">nuclear reaction</a> to be studied. Scientists have not found a way to carry out such a reaction, for it is likely that new types of reactions will be needed to populate nuclei near the center of the island. Nevertheless, the successful synthesis of superheavy elements up to Z = 118 (<a href="/wiki/Oganesson" title="Oganesson">oganesson</a>) with up to 177 neutrons demonstrates a slight stabilizing effect around elements <a href="/wiki/Darmstadtium" title="Darmstadtium">110</a> to <a href="/wiki/Flerovium" title="Flerovium">114</a> that may continue in heavier isotopes, consistent with the existence of the island of stability.<a href="#cite_note-KarpovSHE-2">[2]</a><a href="#cite_note-beachhead-6">[6]</a> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Introduction">Introduction</h2>[<a href="/w/index.php?title=Island_of_stability&action=edit&section=1" title="Edit section: Introduction">edit</a>]</div> <div class="mw-heading mw-heading3"><h3 id="Nuclide_stability">Nuclide stability</h3>[<a href="/w/index.php?title=Island_of_stability&action=edit&section=2" title="Edit section: Nuclide stability">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Valley_of_stability" title="Valley of stability">Valley of stability</a></div> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Isotopes_and_half-life.svg" class="mw-file-description"><img alt="Complete chart of nuclide half-lives plotted against atomic number Z and neutron number N axes." src="//upload.wikimedia.org/wikipedia/commons/thumb/8/80/Isotopes_and_half-life.svg/260px-Isotopes_and_half-life.svg.png" decoding="async" width="260" height="312" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/80/Isotopes_and_half-life.svg/390px-Isotopes_and_half-life.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/80/Isotopes_and_half-life.svg/520px-Isotopes_and_half-life.svg.png 2x" data-file-width="640" data-file-height="768" /></a><figcaption>Chart of half-lives of known nuclides</figcaption></figure> The composition of a <a href="/wiki/Nuclide" title="Nuclide">nuclide</a> (<a href="/wiki/Atomic_nucleus" title="Atomic nucleus">atomic nucleus</a>) is defined by the <a href="/wiki/Number_of_protons" class="mw-redirect" title="Number of protons">number of protons</a> Z and the <a href="/wiki/Number_of_neutrons" class="mw-redirect" title="Number of neutrons">number of neutrons</a> N, which sum to <a href="/wiki/Mass_number" title="Mass number">mass number</a> A. Proton number Z, also named the atomic number, determines the position of an <a href="/wiki/Chemical_element" title="Chemical element">element</a> in the <a href="/wiki/Periodic_table" title="Periodic table">periodic table</a>. The approximately 3300 known nuclides<a href="#cite_note-thoennesweb-7">[7]</a> are commonly represented in a <a href="/wiki/Table_of_nuclides" title="Table of nuclides">chart</a> with Z and N for its axes and the <a href="/wiki/Half-life" title="Half-life">half-life</a> for <a href="/wiki/Radioactive_decay" title="Radioactive decay">radioactive decay</a> indicated for each unstable nuclide (see figure).<a href="#cite_note-8">[8]</a> As of 2019<a class="external text" href="https://en.wikipedia.org/w/index.php?title=Island_of_stability&action=edit">[update]</a>, 251 nuclides are observed to be <a href="/wiki/Stable_nuclide" title="Stable nuclide">stable</a> (having never been observed to decay);<a href="#cite_note-9">[9]</a> generally, as the number of protons increases, stable nuclei have a higher <a href="/wiki/Neutron%E2%80%93proton_ratio" title="Neutron–proton ratio">neutron–proton ratio</a> (more neutrons per proton). The last element in the periodic table that has a stable <a href="/wiki/Isotope" title="Isotope">isotope</a> is <a href="/wiki/Lead" title="Lead">lead</a> (Z = 82),<a href="#cite_note-11">[a]</a><a href="#cite_note-13">[b]</a> with stability (i.e., half-lives of the longest-lived isotopes) generally decreasing in heavier elements,<a href="#cite_note-15">[c]</a><a href="#cite_note-greinerVP-14">[12]</a> especially beyond curium (Z = 96).<a href="#cite_note-GSI2022-16">[13]</a> The half-lives of nuclei also decrease when there is a lopsided neutron–proton ratio, such that the resulting nuclei have too few or too many neutrons to be stable.<a href="#cite_note-CN14-17">[14]</a> The stability of a nucleus is determined by its <a href="/wiki/Nuclear_binding_energy" title="Nuclear binding energy">binding energy</a>, higher binding energy conferring greater stability. The binding energy per nucleon increases with atomic number to a broad plateau around A = 60, then declines.<a href="#cite_note-18">[15]</a> If a nucleus can be split into two parts that have a lower total energy (a consequence of the <a href="/wiki/Mass_defect" class="mw-redirect" title="Mass defect">mass defect</a> resulting from greater binding energy), it is unstable. The nucleus can hold together for a finite time because there is a <a href="/wiki/Potential_barrier" class="mw-redirect" title="Potential barrier">potential barrier</a> opposing the split, but this barrier can be crossed by <a href="/wiki/Quantum_tunneling" class="mw-redirect" title="Quantum tunneling">quantum tunneling</a>. The lower the barrier and the masses of the <a href="/wiki/Fission_product" class="mw-redirect" title="Fission product">fragments</a>, the greater the probability per unit time of a split.<a href="#cite_note-19">[16]</a> Protons in a nucleus are bound together by the <a href="/wiki/Strong_force" class="mw-redirect" title="Strong force">strong force</a>, which counterbalances the <a href="/wiki/Coulomb_repulsion" class="mw-redirect" title="Coulomb repulsion">Coulomb repulsion</a> between positively <a href="/wiki/Electric_charge" title="Electric charge">charged</a> protons. In heavier nuclei, larger numbers of uncharged neutrons are needed to reduce repulsion and confer additional stability. Even so, as physicists started to <a href="/wiki/Synthetic_element" title="Synthetic element">synthesize</a> elements that are not found in nature, they found the stability decreased as the nuclei became heavier.<a href="#cite_note-Sacks-20">[17]</a> Thus, they speculated that the periodic table might come to an end. The discoverers of <a href="/wiki/Plutonium" title="Plutonium">plutonium</a> (element 94) considered naming it "ultimium", thinking it was the last.<a href="#cite_note-21">[18]</a> Following the discoveries of heavier elements, of which some decayed in microseconds, it then seemed that instability with respect to <a href="/wiki/Spontaneous_fission" title="Spontaneous fission">spontaneous fission</a> would limit the existence of heavier elements. In 1939, an upper limit of potential element synthesis was estimated around <a href="/wiki/Rutherfordium" title="Rutherfordium">element 104</a>,<a href="#cite_note-liquiddrop-22">[19]</a> and following the first discoveries of <a href="/wiki/Transactinide_element" class="mw-redirect" title="Transactinide element">transactinide elements</a> in the early 1960s, this upper limit prediction was extended to <a href="/wiki/Hassium" title="Hassium">element 108</a>.<a href="#cite_note-Sacks-20">[17]</a> <div class="mw-heading mw-heading3"><h3 id="Magic_numbers">Magic numbers</h3>[<a href="/w/index.php?title=Island_of_stability&action=edit&section=3" title="Edit section: Magic numbers">edit</a>]</div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Next_proton_shell.svg" class="mw-file-description"><img alt="Diagram showing energy levels of known and predicted proton shells, with gaps at atomic number 82, 114, 120, and 126." src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Next_proton_shell.svg/260px-Next_proton_shell.svg.png" decoding="async" width="260" height="340" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Next_proton_shell.svg/390px-Next_proton_shell.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Next_proton_shell.svg/520px-Next_proton_shell.svg.png 2x" data-file-width="596" data-file-height="780" /></a><figcaption>Diagram showing energy levels of known and predicted proton shells (left and right show two different models).<a href="#cite_note-Kratz-23">[20]</a> The gaps at Z = 82, 114, 120, and 126 correspond to shell closures,<a href="#cite_note-Kratz-23">[20]</a> which have particularly stable configurations and thus result in more stable nuclei.<a href="#cite_note-magickoura-24">[21]</a></figcaption></figure>As early as 1914, the possible existence of <a href="/wiki/Superheavy_element" title="Superheavy element">superheavy elements</a> with atomic numbers well beyond that of uranium—then the heaviest known element—was suggested, when German physicist <a href="/w/index.php?title=Richard_Swinne&action=edit&redlink=1" class="new" title="Richard Swinne (page does not exist)">Richard Swinne</a> proposed that superheavy elements around Z = 108 were a source of radiation in <a href="/wiki/Cosmic_rays" class="mw-redirect" title="Cosmic rays">cosmic rays</a>. Although he did not make any definitive observations, he hypothesized in 1931 that <a href="/wiki/Transuranium_element" title="Transuranium element">transuranium elements</a> around Z = 100 or Z = 108 may be relatively long-lived and possibly exist in nature.<a href="#cite_note-swinne-25">[22]</a> In 1955, American physicist <a href="/wiki/John_Archibald_Wheeler" title="John Archibald Wheeler">John Archibald Wheeler</a> also proposed the existence of these elements;<a href="#cite_note-ghiorso1-26">[23]</a> he is credited with the first usage of the term "superheavy element" in a 1958 paper published with Frederick Werner.<a href="#cite_note-LBL665-27">[24]</a> This idea did not attract wide interest until a decade later, after improvements in the <a href="/wiki/Nuclear_shell_model" title="Nuclear shell model">nuclear shell model</a>. In this model, the atomic nucleus is built up in "shells", analogous to <a href="/wiki/Electron_shell" title="Electron shell">electron shells</a> in atoms. Independently of each other, neutrons and protons have <a href="/wiki/Energy_level" title="Energy level">energy levels</a> that are normally close together, but after a given shell is filled, it takes substantially more energy to start filling the next. Thus, the binding energy per nucleon reaches a local maximum and nuclei with filled shells are more stable than those without.<a href="#cite_note-28">[25]</a> This theory of a nuclear shell model originates in the 1930s, but it was not until 1949 that German physicists <a href="/wiki/Maria_Goeppert_Mayer" title="Maria Goeppert Mayer">Maria Goeppert Mayer</a> and <a href="/wiki/Johannes_Hans_Daniel_Jensen" class="mw-redirect" title="Johannes Hans Daniel Jensen">Johannes Hans Daniel Jensen</a> et al. independently devised the correct formulation.<a href="#cite_note-shellview-29">[26]</a> The numbers of nucleons for which shells are filled are called <a href="/wiki/Magic_number_(physics)" title="Magic number (physics)">magic numbers</a>. Magic numbers of 2, 8, 20, 28, 50, 82 and 126 have been observed for neutrons, and the next number is predicted to be 184.<a href="#cite_note-beachhead-6">[6]</a><a href="#cite_note-30">[27]</a> Protons share the first six of these magic numbers,<a href="#cite_note-31">[28]</a> and 126 has been predicted as a magic proton number since the 1940s.<a href="#cite_note-Kragh-32">[29]</a> Nuclides with a magic number of each—such as <a href="/wiki/Oxygen-16" title="Oxygen-16">16O</a> (Z = 8, N = 8), 132Sn (Z = 50, N = 82), and 208Pb (Z = 82, N = 126)—are referred to as "doubly magic" and are more stable than nearby nuclides as a result of greater binding energies.<a href="#cite_note-33">[30]</a><a href="#cite_note-DoublyMagic-34">[31]</a> In the late 1960s, more sophisticated shell models were formulated by American physicist William Myers and Polish physicist <a href="/wiki/W%C5%82adys%C5%82aw_%C5%9Awi%C4%85tecki_(physicist)" title="Władysław Świątecki (physicist)">Władysław Świątecki</a>, and independently by German physicist <a href="/w/index.php?title=Heiner_Meldner&action=edit&redlink=1" class="new" title="Heiner Meldner (page does not exist)">Heiner Meldner</a> (1939–2019<a href="#cite_note-35">[32]</a><a href="#cite_note-36">[33]</a>). With these models, taking into account Coulomb repulsion, Meldner predicted that the next proton magic number may be 114 instead of 126.<a href="#cite_note-quest-37">[34]</a> Myers and Świątecki appear to have coined the term "island of stability", and American chemist <a href="/wiki/Glenn_Seaborg" class="mw-redirect" title="Glenn Seaborg">Glenn Seaborg</a>, later a discoverer of many of the superheavy elements, quickly adopted the term and promoted it.<a href="#cite_note-Kragh-32">[29]</a><a href="#cite_note-Kragh17-38">[35]</a> Myers and Świątecki also proposed that some superheavy nuclei would be longer-lived as a consequence of higher <a href="/wiki/Fission_barrier" title="Fission barrier">fission barriers</a>. Further improvements in the nuclear shell model by Soviet physicist <a href="/wiki/Vilen_Strutinsky" title="Vilen Strutinsky">Vilen Strutinsky</a> led to the emergence of the macroscopic–microscopic method, a nuclear mass model that takes into consideration both smooth trends characteristic of the <a href="/wiki/Liquid_drop_model" class="mw-redirect" title="Liquid drop model">liquid drop model</a> and local fluctuations such as shell effects. This approach enabled Swedish physicist <a href="/wiki/Sven_G%C3%B6sta_Nilsson" title="Sven Gösta Nilsson">Sven Nilsson</a> et al., as well as other groups, to make the first detailed calculations of the stability of nuclei within the island.<a href="#cite_note-quest-37">[34]</a> With the emergence of this model, Strutinsky, Nilsson, and other groups argued for the existence of the doubly magic nuclide 298Fl (Z = 114, N = 184), rather than 310<a href="/wiki/Unbihexium" title="Unbihexium">Ubh</a> (Z = 126, N = 184) which was predicted to be doubly magic as early as 1957.<a href="#cite_note-quest-37">[34]</a> Subsequently, estimates of the proton magic number have ranged from 114 to 126, and there is still no consensus.<a href="#cite_note-beachhead-6">[6]</a><a href="#cite_note-magickoura-24">[21]</a><a href="#cite_note-newsci10-39">[36]</a><a href="#cite_note-not114-40">[37]</a> <div class="mw-heading mw-heading2"><h2 id="Discoveries">Discoveries</h2>[<a href="/w/index.php?title=Island_of_stability&action=edit&section=4" title="Edit section: Discoveries">edit</a>]</div> <table class="wikitable sortable" style="float:left; margin-right:1em; font-size:85%;"> <caption>Most stable isotopes of superheavy elements (Z ≥ 104) </caption> <tbody><tr> <th rowspan="2">Element </th> <th rowspan="2">Atomic number </th> <th rowspan="2">Most stable isotope </th> <th colspan="2">Half-life<a href="#cite_note-41">[d]</a> </th></tr> <tr> <th>Publications <a href="#cite_note-42">[38]</a><a href="#cite_note-shesummary-43">[39]</a> </th> <th>NUBASE 2020 <a href="#cite_note-NUBASE2020-44">[40]</a> </th></tr> <tr> <td><a href="/wiki/Rutherfordium" title="Rutherfordium">Rutherfordium</a></td> <td>104</td> <td><a href="/wiki/Isotopes_of_rutherfordium" title="Isotopes of rutherfordium">267Rf</a></td> <td data-sort-value="2880">48 min<a href="#cite_note-PuCa2022-45">[41]</a></td> <td data-sort-value="9000">2.5 h </td></tr> <tr> <td><a href="/wiki/Dubnium" title="Dubnium">Dubnium</a></td> <td>105</td> <td><a href="/wiki/Isotopes_of_dubnium" title="Isotopes of dubnium">268Db</a></td> <td data-sort-value="57600">16 h<a href="#cite_note-SHEfactory0922-46">[42]</a></td> <td data-sort-value="104400">1.2 d </td></tr> <tr> <td><a href="/wiki/Seaborgium" title="Seaborgium">Seaborgium</a></td> <td>106</td> <td><a href="/wiki/Isotopes_of_seaborgium" title="Isotopes of seaborgium">269Sg</a></td> <td data-sort-value="840">14 min<a href="#cite_note-PuCa2017-47">[43]</a></td> <td data-sort-value="300">5 min </td></tr> <tr> <td><a href="/wiki/Bohrium" title="Bohrium">Bohrium</a></td> <td>107</td> <td><a href="/wiki/Isotopes_of_bohrium" title="Isotopes of bohrium">270Bh</a><a href="#cite_note-49">[e]</a></td> <td data-sort-value="144">2.4 min<a href="#cite_note-Mc2022-50">[45]</a></td> <td data-sort-value="228">3.8 min </td></tr> <tr> <td><a href="/wiki/Hassium" title="Hassium">Hassium</a></td> <td>108</td> <td><a href="/wiki/Isotopes_of_hassium" title="Isotopes of hassium">269Hs</a></td> <td data-sort-value="9.7">9.7 s<a href="#cite_note-chemHs-51">[46]</a></td> <td data-sort-value="16">16 s </td></tr> <tr> <td><a href="/wiki/Meitnerium" title="Meitnerium">Meitnerium</a></td> <td>109</td> <td><a href="/wiki/Isotopes_of_meitnerium" title="Isotopes of meitnerium">278Mt</a><a href="#cite_note-X-53">[f]</a><a href="#cite_note-54">[g]</a></td> <td data-sort-value="4.5">4.5 s</td> <td data-sort-value="6">6 s </td></tr> <tr> <td><a href="/wiki/Darmstadtium" title="Darmstadtium">Darmstadtium</a></td> <td>110</td> <td><a href="/wiki/Isotopes_of_darmstadtium" title="Isotopes of darmstadtium">281Ds</a><a href="#cite_note-X-53">[f]</a></td> <td data-sort-value="12.7">12.7 s</td> <td data-sort-value="14">14 s </td></tr> <tr> <td><a href="/wiki/Roentgenium" title="Roentgenium">Roentgenium</a></td> <td>111</td> <td><a href="/wiki/Isotopes_of_roentgenium" title="Isotopes of roentgenium">282Rg</a><a href="#cite_note-X-53">[f]</a><a href="#cite_note-55">[h]</a></td> <td data-sort-value="100">1.7 min</td> <td data-sort-value="130">2.2 min </td></tr> <tr> <td><a href="/wiki/Copernicium" title="Copernicium">Copernicium</a></td> <td>112</td> <td><a href="/wiki/Isotopes_of_copernicium" title="Isotopes of copernicium">285Cn</a><a href="#cite_note-X-53">[f]</a></td> <td data-sort-value="28">28 s</td> <td data-sort-value="30">30 s </td></tr> <tr> <td><a href="/wiki/Nihonium" title="Nihonium">Nihonium</a></td> <td>113</td> <td><a href="/wiki/Isotopes_of_nihonium" title="Isotopes of nihonium">286Nh</a><a href="#cite_note-X-53">[f]</a></td> <td data-sort-value="9.5">9.5 s</td> <td data-sort-value="12">12 s </td></tr> <tr> <td><a href="/wiki/Flerovium" title="Flerovium">Flerovium</a></td> <td>114</td> <td><a href="/wiki/Isotopes_of_flerovium" title="Isotopes of flerovium">289Fl</a><a href="#cite_note-X-53">[f]</a><a href="#cite_note-56">[i]</a></td> <td data-sort-value="1.9">1.9 s</td> <td data-sort-value="2.1">2.1 s </td></tr> <tr> <td><a href="/wiki/Moscovium" title="Moscovium">Moscovium</a></td> <td>115</td> <td><a href="/wiki/Isotopes_of_moscovium" title="Isotopes of moscovium">290Mc</a><a href="#cite_note-X-53">[f]</a></td> <td data-sort-value="0.65">650 ms</td> <td data-sort-value="0.84">840 ms </td></tr> <tr> <td><a href="/wiki/Livermorium" title="Livermorium">Livermorium</a></td> <td>116</td> <td><a href="/wiki/Isotopes_of_livermorium" title="Isotopes of livermorium">293Lv</a><a href="#cite_note-X-53">[f]</a></td> <td data-sort-value="0.057">57 ms</td> <td data-sort-value="0.07">70 ms </td></tr> <tr> <td><a href="/wiki/Tennessine" title="Tennessine">Tennessine</a></td> <td>117</td> <td><a href="/wiki/Isotopes_of_tennessine" title="Isotopes of tennessine">294Ts</a><a href="#cite_note-X-53">[f]</a></td> <td data-sort-value="0.051">51 ms</td> <td data-sort-value="0.07">70 ms </td></tr> <tr> <td><a href="/wiki/Oganesson" title="Oganesson">Oganesson</a></td> <td>118</td> <td><a href="/wiki/Isotopes_of_oganesson" title="Isotopes of oganesson">294Og</a><a href="#cite_note-X-53">[f]</a></td> <td data-sort-value="0.00069">690 μs</td> <td data-sort-value="0.0007">700 μs </td></tr></tbody></table> Interest in a possible island of stability grew throughout the 1960s, as some calculations suggested that it might contain nuclides with half-lives of billions of years.<a href="#cite_note-lodhi11-57">[48]</a><a href="#cite_note-nuclei-5">[5]</a> They were also predicted to be especially stable against spontaneous fission in spite of their high atomic mass.<a href="#cite_note-quest-37">[34]</a><a href="#cite_note-Cwiok-58">[49]</a> It was thought that if such elements exist and are sufficiently long-lived, there may be several novel applications as a consequence of their nuclear and chemical properties. These include use in <a href="/wiki/Particle_accelerator" title="Particle accelerator">particle accelerators</a> as <a href="/wiki/Neutron_source" title="Neutron source">neutron sources</a>, in <a href="/wiki/Nuclear_weapon" title="Nuclear weapon">nuclear weapons</a> as a consequence of their predicted low <a href="/wiki/Critical_mass" title="Critical mass">critical masses</a> and high number of neutrons emitted per fission,<a href="#cite_note-59">[50]</a> and as <a href="/wiki/Nuclear_fuel" title="Nuclear fuel">nuclear fuel</a> to power space missions.<a href="#cite_note-newsci10-39">[36]</a> These speculations led many researchers to conduct searches for superheavy elements in the 1960s and 1970s, both in nature and through <a href="/wiki/Nucleosynthesis" title="Nucleosynthesis">nucleosynthesis</a> in particle accelerators.<a href="#cite_note-ghiorso1-26">[23]</a> During the 1970s, many searches for long-lived superheavy nuclei were conducted. Experiments aimed at synthesizing elements ranging in atomic number from 110 to 127 were conducted at laboratories around the world.<a href="#cite_note-LodhiTable-60">[51]</a><a href="#cite_note-emsley-61">[52]</a> These elements were sought in fusion-evaporation reactions, in which a heavy target made of one nuclide is <a href="/wiki/Irradiation#Ion_irradiation" title="Irradiation">irradiated</a> by accelerated ions of another in a <a href="/wiki/Cyclotron" title="Cyclotron">cyclotron</a>, and new nuclides are produced after these nuclei <a href="/wiki/Nuclear_fusion" title="Nuclear fusion">fuse</a> and the resulting excited system releases energy by evaporating several particles (usually protons, neutrons, or alpha particles). These reactions are divided into "cold" and "hot" fusion, which respectively create systems with lower and higher <a href="/wiki/Excited_state" title="Excited state">excitation</a> energies; this affects the yield of the reaction.<a href="#cite_note-JK17-62">[53]</a> For example, the reaction between 248Cm and 40Ar was expected to yield isotopes of element 114, and that between 232Th and 84Kr was expected to yield isotopes of element 126.<a href="#cite_note-H404-63">[54]</a> None of these attempts were successful,<a href="#cite_note-LodhiTable-60">[51]</a><a href="#cite_note-emsley-61">[52]</a> indicating that such experiments may have been insufficiently sensitive if reaction <a href="/wiki/Cross_section_(physics)" title="Cross section (physics)">cross sections</a> were low—resulting in lower yields—or that any nuclei reachable via such fusion-evaporation reactions might be too short-lived for detection.<a href="#cite_note-microsec-64">[j]</a> Subsequent successful experiments reveal that half-lives and cross sections indeed decrease with increasing atomic number, resulting in the synthesis of only a few short-lived atoms of the heaviest elements in each experiment;<a href="#cite_note-Karpov2015-65">[55]</a> as of 2022<a class="external text" href="https://en.wikipedia.org/w/index.php?title=Island_of_stability&action=edit">[update]</a>, the highest reported cross section for a superheavy nuclide near the island of stability is for 288Mc in the reaction between 243Am and 48Ca.<a href="#cite_note-SHEfactory0922-46">[42]</a> Similar searches in nature were also unsuccessful, suggesting that if superheavy elements do exist in nature, their abundance is less than 10−14 <a href="/wiki/Mole_(chemistry)" class="mw-redirect" title="Mole (chemistry)">moles</a> of superheavy elements per mole of ore.<a href="#cite_note-66">[56]</a> Despite these unsuccessful attempts to observe long-lived superheavy nuclei,<a href="#cite_note-quest-37">[34]</a> new superheavy elements were synthesized <a href="/wiki/Timeline_of_chemical_element_discoveries" class="mw-redirect" title="Timeline of chemical element discoveries">every few years</a> in laboratories through <a href="/wiki/Nuclear_fusion#Beam-beam_or_beam-target_fusion" title="Nuclear fusion">light-ion bombardment</a> and cold fusion<a href="#cite_note-67">[k]</a> reactions; rutherfordium, the first <a href="/wiki/Transactinide" class="mw-redirect" title="Transactinide">transactinide</a>, was discovered in 1969, and copernicium, eight protons closer to the island of stability predicted at Z = 114, was reached by 1996. Even though the half-lives of these nuclei are very short (on the order of <a href="/wiki/Second" title="Second">seconds</a>),<a href="#cite_note-NUBASE2020-44">[40]</a> the very existence of elements heavier than rutherfordium is indicative of stabilizing effects thought to be caused by closed shells; a <a href="/wiki/Semi-empirical_mass_formula" title="Semi-empirical mass formula">model not considering such effects</a> would forbid the existence of these elements due to rapid spontaneous fission.<a href="#cite_note-liquiddrop-22">[19]</a> Flerovium, with the expected magic 114 protons, was first synthesized in 1998 at the <a href="/wiki/Joint_Institute_for_Nuclear_Research" title="Joint Institute for Nuclear Research">Joint Institute for Nuclear Research</a> in <a href="/wiki/Dubna" title="Dubna">Dubna</a>, Russia, by a group of physicists led by <a href="/wiki/Yuri_Oganessian" title="Yuri Oganessian">Yuri Oganessian</a>. A single atom of element 114 was detected, with a lifetime of 30.4 seconds, and its <a href="/wiki/Decay_product" title="Decay product">decay products</a> had half-lives measurable in minutes.<a href="#cite_note-99Og01-68">[57]</a> Because the produced nuclei underwent alpha decay rather than fission, and the half-lives were several <a href="/wiki/Orders_of_magnitude_(time)" title="Orders of magnitude (time)">orders of magnitude</a> longer than those previously predicted<a href="#cite_note-70">[l]</a> or observed for superheavy elements,<a href="#cite_note-99Og01-68">[57]</a> this event was seen as a "textbook example" of a decay chain characteristic of the island of stability, providing strong evidence for the existence of the island of stability in this region.<a href="#cite_note-71">[59]</a> Even though the original 1998 chain was not observed again, and its assignment remains uncertain,<a href="#cite_note-Hofmann2016-48">[44]</a> further successful experiments in the next two decades led to the discovery of all elements up to <a href="/wiki/Oganesson" title="Oganesson">oganesson</a>, whose half-lives were found to exceed initially predicted values; these decay properties further support the presence of the island of stability.<a href="#cite_note-beachhead-6">[6]</a><a href="#cite_note-48Ca-52">[47]</a><a href="#cite_note-117s-72">[60]</a> However, a 2021 study on the decay chains of flerovium isotopes suggests that there is no strong stabilizing effect from Z = 114 in the region of known nuclei (N = 174),<a href="#cite_note-280Ds2021-73">[61]</a> and that extra stability would be predominantly a consequence of the neutron shell closure.<a href="#cite_note-not114-40">[37]</a> Although known nuclei still fall several neutrons short of N = 184 where maximum stability is expected (the most neutron-rich confirmed nuclei, 293Lv and 294Ts, only reach N = 177), and the exact location of the center of the island remains unknown,<a href="#cite_note-physorg-74">[62]</a><a href="#cite_note-beachhead-6">[6]</a> the trend of increasing stability closer to N = 184 has been demonstrated. For example, the isotope 285Cn, with eight more neutrons than 277Cn, has a half-life almost five orders of magnitude longer. This trend is expected to continue into unknown heavier isotopes in the vicinity of the shell closure.<a href="#cite_note-Zagrebaev-75">[63]</a> <div class="mw-heading mw-heading3"><h3 id="Deformed_nuclei">Deformed nuclei</h3>[<a href="/w/index.php?title=Island_of_stability&action=edit&section=5" title="Edit section: Deformed nuclei">edit</a>]</div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Even_Z_alpha_decay_chains.svg" class="mw-file-description"><img alt="A diagram of observed decay chains of even Z superheavy nuclides, consisting of several alpha decays and terminating in spontaneous fission." src="//upload.wikimedia.org/wikipedia/commons/thumb/2/24/Even_Z_alpha_decay_chains.svg/440px-Even_Z_alpha_decay_chains.svg.png" decoding="async" width="440" height="276" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/24/Even_Z_alpha_decay_chains.svg/660px-Even_Z_alpha_decay_chains.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/24/Even_Z_alpha_decay_chains.svg/880px-Even_Z_alpha_decay_chains.svg.png 2x" data-file-width="1101" data-file-height="690" /></a><figcaption>A summary of observed decay chains in even-Z superheavy elements, including tentative assignments in chains 3, 5, and 8.<a href="#cite_note-Hofmann2016-48">[44]</a> According to another analysis, chain 3 (starting at element 120) is not a real decay chain, but is rather a random sequence of events.<a href="#cite_note-76">[64]</a> There is a general trend of increasing stability for isotopes with a greater neutron excess (N − Z, the difference in the number of protons and neutrons), especially in elements 110, 112, and 114, which strongly suggests that the center of the island of stability lies among even heavier isotopes.</figcaption></figure>Though nuclei within the island of stability around N = 184 are predicted to be <a href="/wiki/Spherical" class="mw-redirect" title="Spherical">spherical</a>, studies from the early 1990s—beginning with Polish physicists Zygmunt Patyk and Adam Sobiczewski in 1991<a href="#cite_note-77">[65]</a>—suggest that some superheavy elements do not have perfectly spherical nuclei.<a href="#cite_note-structure-78">[66]</a><a href="#cite_note-zaioo-79">[67]</a> A change in the shape of the nucleus changes the position of neutrons and protons in the shell. Research indicates that large nuclei farther from spherical magic numbers are <a href="/wiki/Superdeformation" title="Superdeformation">deformed</a>,<a href="#cite_note-zaioo-79">[67]</a> causing magic numbers to shift or new magic numbers to appear. Current theoretical investigation indicates that in the region Z = 106–108 and N ≈ 160–164, nuclei may be more resistant to fission as a consequence of shell effects for deformed nuclei; thus, such superheavy nuclei would only undergo alpha decay.<a href="#cite_note-predictions-80">[68]</a><a href="#cite_note-longlived-81">[69]</a><a href="#cite_note-nuclear-82">[70]</a> Hassium-270 is now believed to be a doubly magic deformed nucleus, with deformed magic numbers Z = 108 and N = 162.<a href="#cite_note-270Hs01-83">[71]</a> It has a half-life of 9 seconds.<a href="#cite_note-NUBASE2020-44">[40]</a> This is consistent with models that take into account the deformed nature of nuclei intermediate between the actinides and island of stability near N = 184, in which a stability "peninsula" emerges at deformed magic numbers Z = 108 and N = 162.<a href="#cite_note-Moller97-84">[72]</a><a href="#cite_note-270Hs2020-85">[73]</a> Determination of the decay properties of neighboring hassium and seaborgium isotopes near N = 162 provides further strong evidence for this region of relative stability in deformed nuclei.<a href="#cite_note-Cwiok-58">[49]</a> This also strongly suggests that the island of stability (for spherical nuclei) is not completely isolated from the region of stable nuclei, but rather that both regions are instead linked through an isthmus of relatively stable deformed nuclei.<a href="#cite_note-Moller97-84">[72]</a><a href="#cite_note-kjmoody-86">[74]</a> <div class="mw-heading mw-heading2"><h2 id="Predicted_decay_properties">Predicted decay properties</h2>[<a href="/w/index.php?title=Island_of_stability&action=edit&section=6" title="Edit section: Predicted decay properties">edit</a>]</div> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Superheavy_decay_modes_predicted.png" class="mw-file-description"><img alt="A diagram depicting the four major decay modes (alpha, electron capture, beta, and spontaneous fission) of known and predicted superheavy nuclei." src="//upload.wikimedia.org/wikipedia/commons/thumb/2/22/Superheavy_decay_modes_predicted.png/390px-Superheavy_decay_modes_predicted.png" decoding="async" width="390" height="257" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/22/Superheavy_decay_modes_predicted.png/585px-Superheavy_decay_modes_predicted.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/22/Superheavy_decay_modes_predicted.png/780px-Superheavy_decay_modes_predicted.png 2x" data-file-width="970" data-file-height="640" /></a><figcaption>A diagram depicting predicted decay modes of superheavy nuclei, with observed nuclei given black outlines. The most neutron-deficient nuclei as well as those immediately beyond the shell closure at N = 184 are predicted to predominantly undergo spontaneous fission (SF), whereas alpha decay (α) may dominate in neutron-deficient nuclei closer to the island, and significant <a href="/wiki/Beta_decay" title="Beta decay">beta decay</a> (β) or <a href="/wiki/Electron_capture" title="Electron capture">electron capture</a> (EC) branches may appear closest to the center of the island around 291Cn and 293Cn.<a href="#cite_note-KarpovSHE-2">[2]</a></figcaption></figure> The <a href="/wiki/Half-lives" class="mw-redirect" title="Half-lives">half-lives</a> of nuclei in the island of stability itself are unknown since none of the nuclides that would be "on the island" have been observed. Many physicists believe that the half-lives of these nuclei are relatively short, on the order of minutes or days.<a href="#cite_note-physorg-74">[62]</a> Some theoretical calculations indicate that their half-lives may be long, on the order of 100 years,<a href="#cite_note-KarpovSHE-2">[2]</a><a href="#cite_note-Karpov2015-65">[55]</a> or possibly as long as 109 years.<a href="#cite_note-nuclei-5">[5]</a> The shell closure at N = 184 is predicted to result in longer <a href="/wiki/Partial_half-lives" class="mw-redirect" title="Partial half-lives">partial half-lives</a> for alpha decay and spontaneous fission.<a href="#cite_note-KarpovSHE-2">[2]</a> It is believed that the shell closure will result in higher fission barriers for nuclei around 298Fl, strongly hindering fission and perhaps resulting in fission half-lives 30 orders of magnitude greater than those of nuclei unaffected by the shell closure.<a href="#cite_note-quest-37">[34]</a><a href="#cite_note-SHlimit-87">[75]</a> For example, the neutron-deficient isotope 284Fl (with N = 170) undergoes fission with a half-life of 2.5 milliseconds, and is thought to be one of the most neutron-deficient nuclides with increased stability in the vicinity of the N = 184 shell closure.<a href="#cite_note-PuCa2017-47">[43]</a> Beyond this point, some undiscovered isotopes are predicted to undergo fission with still shorter half-lives, limiting the existence<a href="#cite_note-89">[m]</a> and possible observation<a href="#cite_note-microsec-64">[j]</a> of superheavy nuclei far from the island of stability (namely for N < 170 as well as for Z > 120 and N > 184).<a href="#cite_note-CN14-17">[14]</a><a href="#cite_note-liquiddrop-22">[19]</a> These nuclei may undergo alpha decay or spontaneous fission in microseconds or less, with some fission half-lives estimated on the order of 10−20 seconds in the absence of fission barriers.<a href="#cite_note-predictions-80">[68]</a><a href="#cite_note-longlived-81">[69]</a><a href="#cite_note-nuclear-82">[70]</a><a href="#cite_note-SHlimit-87">[75]</a> In contrast, 298Fl (predicted to lie within the region of maximum shell effects) may have a much longer spontaneous fission half-life, possibly on the order of 1019 years.<a href="#cite_note-quest-37">[34]</a> In the center of the island, there may be competition between alpha decay and spontaneous fission, though the exact ratio is model-dependent.<a href="#cite_note-KarpovSHE-2">[2]</a> The alpha decay half-lives of 1700 nuclei with 100 ≤ Z ≤ 130 have been calculated in a quantum tunneling model with both experimental and theoretical alpha decay <a href="/wiki/Q_value_(nuclear_science)" title="Q value (nuclear science)">Q-values</a>, and are in agreement with observed half-lives for some of the heaviest isotopes.<a href="#cite_note-predictions-80">[68]</a><a href="#cite_note-longlived-81">[69]</a><a href="#cite_note-nuclear-82">[70]</a><a href="#cite_note-half-lifesall-92">[79]</a><a href="#cite_note-decaychains-93">[80]</a><a href="#cite_note-tunneling-94">[81]</a> The longest-lived nuclides are also predicted to lie on the <a href="/wiki/Beta-stability_line" class="mw-redirect" title="Beta-stability line">beta-stability line</a>, for <a href="/wiki/Beta_decay" title="Beta decay">beta decay</a> is predicted to compete with the other decay modes near the predicted center of the island, especially for isotopes of elements 111–115. Unlike other decay modes predicted for these nuclides, beta decay does not change the mass number. Instead, a neutron is converted into a proton or vice versa, producing an adjacent <a href="/wiki/Isobar_(nuclide)" title="Isobar (nuclide)">isobar</a> closer to the center of stability (the isobar with the lowest <a href="/wiki/Mass_excess" title="Mass excess">mass excess</a>). For example, significant beta decay branches may exist in nuclides such as 291Fl and 291Nh; these nuclides have only a few more neutrons than known nuclides, and might decay via a "narrow pathway" towards the center of the island of stability.<a href="#cite_note-ZagrebaevPPT-1">[1]</a><a href="#cite_note-KarpovSHE-2">[2]</a> The possible role of beta decay is highly uncertain, as some isotopes of these elements (such as 290Fl and 293Mc) are predicted to have shorter partial half-lives for alpha decay. Beta decay would reduce competition and would result in alpha decay remaining the dominant decay channel, unless additional stability towards alpha decay exists in <a href="/wiki/Superdeformed" class="mw-redirect" title="Superdeformed">superdeformed</a> isomers of these nuclides.<a href="#cite_note-sarriguren-95">[82]</a> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Superheavy_decay_modes_predicted_(KTUY).svg" class="mw-file-description"><img alt="A diagram depicting the four major decay modes (alpha, electron capture, beta, and spontaneous fission) of known and predicted superheavy nuclei, according to the KTUY model." src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Superheavy_decay_modes_predicted_%28KTUY%29.svg/390px-Superheavy_decay_modes_predicted_%28KTUY%29.svg.png" decoding="async" width="390" height="219" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Superheavy_decay_modes_predicted_%28KTUY%29.svg/585px-Superheavy_decay_modes_predicted_%28KTUY%29.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Superheavy_decay_modes_predicted_%28KTUY%29.svg/780px-Superheavy_decay_modes_predicted_%28KTUY%29.svg.png 2x" data-file-width="769" data-file-height="431" /></a><figcaption>This chart of predicted decay modes, derived from theoretical research of the <a href="/wiki/Japan_Atomic_Energy_Agency" title="Japan Atomic Energy Agency">Japan Atomic Energy Agency</a>, predicts the center of the island of stability around 294Ds; it would be the longest-lived of several relatively long-lived nuclides primarily undergoing alpha decay (circled). This is the region where the beta-stability line crosses the region stabilized by the shell closure at N = 184. To the left and right, half-lives decrease as fission becomes the dominant decay mode, consistent with other models.<a href="#cite_note-CN14-17">[14]</a><a href="#cite_note-SHlimit-87">[75]</a></figcaption></figure> Considering all decay modes, various models indicate a shift of the center of the island (i.e., the longest-living nuclide) from 298Fl to a lower atomic number, and competition between alpha decay and spontaneous fission in these nuclides;<a href="#cite_note-Nilsson1969-96">[83]</a> these include 100-year half-lives for 291Cn and 293Cn,<a href="#cite_note-Karpov2015-65">[55]</a><a href="#cite_note-Palenzuela-91">[78]</a> a 1000-year half-life for 296Cn,<a href="#cite_note-Karpov2015-65">[55]</a> a 300-year half-life for 294Ds,<a href="#cite_note-SHlimit-87">[75]</a> and a 3500-year half-life for 293Ds,<a href="#cite_note-prc08ADNDT08-97">[84]</a><a href="#cite_note-98">[85]</a> with 294Ds and 296Cn exactly at the N = 184 shell closure. It has also been posited that this region of enhanced stability for elements with 112 ≤ Z ≤ 118 may instead be a consequence of nuclear deformation, and that the true center of the island of stability for spherical superheavy nuclei lies around 306<a href="/wiki/Unbibium" title="Unbibium">Ubb</a> (Z = 122, N = 184).<a href="#cite_note-Kratz-23">[20]</a> This model defines the island of stability as the region with the greatest resistance to fission rather than the longest total half-lives;<a href="#cite_note-Kratz-23">[20]</a> the nuclide 306Ubb is still predicted to have a short half-life with respect to alpha decay.<a href="#cite_note-KarpovSHE-2">[2]</a><a href="#cite_note-nuclear-82">[70]</a> The island of stability for spherical nuclei may also be a "coral reef" (i.e., a broad region of increased stability without a clear "peak") around N = 184 and 114 ≤ Z ≤ 120, with half-lives rapidly decreasing at higher atomic number, due to combined effects from proton and neutron shell closures.<a href="#cite_note-coral-reef-99">[86]</a> Another potentially significant decay mode for the heaviest superheavy elements was proposed to be <a href="/wiki/Cluster_decay" title="Cluster decay">cluster decay</a> by Romanian physicists <a href="/wiki/Dorin_N._Poenaru" title="Dorin N. Poenaru">Dorin N. Poenaru</a> and Radu A. Gherghescu and German physicist <a href="/wiki/Walter_Greiner" title="Walter Greiner">Walter Greiner</a>. Its <a href="/wiki/Branching_ratio" class="mw-redirect" title="Branching ratio">branching ratio</a> relative to alpha decay is expected to increase with atomic number such that it may compete with alpha decay around Z = 120, and perhaps become the dominant decay mode for heavier nuclides around Z = 124. As such, it is expected to play a larger role beyond the center of the island of stability (though still influenced by shell effects), unless the center of the island lies at a higher atomic number than predicted.<a href="#cite_note-cldec-100">[87]</a> <div class="mw-heading mw-heading2"><h2 id="Possible_natural_occurrence">Possible natural occurrence</h2>[<a href="/w/index.php?title=Island_of_stability&action=edit&section=7" title="Edit section: Possible natural occurrence">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Extinct_isotopes_of_superheavy_elements" title="Extinct isotopes of superheavy elements">Extinct isotopes of superheavy elements</a></div> Even though half-lives of hundreds or thousands of years would be relatively long for superheavy elements, they are far too short for any such nuclides to exist <a href="/wiki/Primordial_nuclide" title="Primordial nuclide">primordially</a> on Earth. Additionally, instability of nuclei intermediate between primordial actinides (<a href="/wiki/Thorium-232" title="Thorium-232">232Th</a>, <a href="/wiki/Uranium-235" title="Uranium-235">235U</a>, and <a href="/wiki/Uranium-238" title="Uranium-238">238U</a>) and the island of stability may inhibit production of nuclei within the island in <a href="/wiki/R-process" title="R-process">r-process</a> nucleosynthesis. Various models suggest that spontaneous fission will be the dominant decay mode of nuclei with A > 280, and that neutron-induced or beta-delayed <a href="/wiki/Nuclear_fission" title="Nuclear fission">fission</a>—respectively neutron capture and beta decay immediately followed by fission—will become the primary reaction channels. As a result, beta decay towards the island of stability may only occur within a very narrow path or may be entirely blocked by fission, thus precluding the synthesis of nuclides within the island.<a href="#cite_note-natural-101">[88]</a> The non-observation of superheavy nuclides such as 292Hs and 298Fl in nature is thought to be a consequence of a low yield in the r-process resulting from this mechanism, as well as half-lives too short to allow measurable quantities to persist in nature.<a href="#cite_note-spectrometry-102">[89]</a><a href="#cite_note-106">[n]</a> Various studies utilizing <a href="/wiki/Accelerator_mass_spectroscopy" class="mw-redirect" title="Accelerator mass spectroscopy">accelerator mass spectroscopy</a> and <a href="/wiki/Crystal_scintillator" class="mw-redirect" title="Crystal scintillator">crystal scintillators</a> have reported upper limits of the natural abundance of such long-lived superheavy nuclei on the order of 10−14 relative to their stable <a href="/wiki/Homolog_(chemistry)" class="mw-redirect" title="Homolog (chemistry)">homologs</a>.<a href="#cite_note-nat-scint-105">[92]</a> Despite these obstacles to their synthesis, a 2013 study published by a group of Russian physicists led by <a href="/w/index.php?title=Valeriy_Zagrebaev&action=edit&redlink=1" class="new" title="Valeriy Zagrebaev (page does not exist)">Valeriy Zagrebaev</a> proposes that the longest-lived copernicium isotopes may occur at an abundance of 10−12 relative to lead, whereby they may be detectable in <a href="/wiki/Cosmic_ray" title="Cosmic ray">cosmic rays</a>.<a href="#cite_note-Zagrebaev-75">[63]</a> Similarly, in a 2013 experiment, a group of Russian physicists led by Aleksandr Bagulya reported the possible observation of three <a href="/wiki/Cosmogenic" class="mw-redirect" title="Cosmogenic">cosmogenic</a> superheavy nuclei in <a href="/wiki/Olivine" title="Olivine">olivine</a> crystals in meteorites. The atomic number of these nuclei was estimated to be between 105 and 130, with one nucleus likely constrained between 113 and 129, and their lifetimes were estimated to be at least 3,000 years. Although this observation has yet to be confirmed in independent studies, it strongly suggests the existence of the island of stability, and is consistent with theoretical calculations of half-lives of these nuclides.<a href="#cite_note-oly1-107">[93]</a><a href="#cite_note-nats-108">[94]</a><a href="#cite_note-19cq-109">[95]</a> The decay of heavy, long-lived elements in the island of stability is a proposed explanation for the unusual presence of the short-lived <a href="/wiki/Radionuclide" title="Radionuclide">radioactive isotopes</a> observed in <a href="/wiki/Przybylski%27s_Star" title="Przybylski's Star">Przybylski's Star</a>.<a href="#cite_note-110">[96]</a> <div class="mw-heading mw-heading2"><h2 id="Synthesis_and_difficulties">Synthesis and difficulties</h2>[<a href="/w/index.php?title=Island_of_stability&action=edit&section=8" title="Edit section: Synthesis and difficulties">edit</a>]</div> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Island_of_Stability.svg" class="mw-file-description"><img alt="A 3D graph of stability of elements vs. number of protons Z and neutrons N, showing a "mountain chain" running diagonally through the graph from the low to high numbers, as well as an "island of stability" at high N and Z." src="//upload.wikimedia.org/wikipedia/commons/thumb/b/bc/Island_of_Stability.svg/440px-Island_of_Stability.svg.png" decoding="async" width="440" height="225" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/bc/Island_of_Stability.svg/660px-Island_of_Stability.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/bc/Island_of_Stability.svg/880px-Island_of_Stability.svg.png 2x" data-file-width="842" data-file-height="431" /></a><figcaption>Three-dimensional rendering of the island of stability around <a href="/wiki/Neutron_number" title="Neutron number">N</a> = 178 and <a href="/wiki/Atomic_number" title="Atomic number">Z</a> = 112</figcaption></figure> The manufacture of nuclei on the island of stability proves to be very difficult because the nuclei available as starting materials do not deliver the necessary sum of neutrons. Radioactive ion beams (such as 44S) in combination with actinide targets (such as 248<a href="/wiki/Curium" title="Curium">Cm</a>) may allow the production of more neutron rich nuclei nearer to the center of the island of stability, though such beams are not currently available in the required intensities to conduct such experiments.<a href="#cite_note-Zagrebaev-75">[63]</a><a href="#cite_note-Popeko-111">[97]</a><a href="#cite_note-Zhu19-112">[98]</a> Several heavier isotopes such as 250Cm and 254<a href="/wiki/Einsteinium" title="Einsteinium">Es</a> may still be usable as targets, allowing the production of isotopes with one or two more neutrons than known isotopes,<a href="#cite_note-Zagrebaev-75">[63]</a> though the production of several milligrams of these rare isotopes to create a target is difficult.<a href="#cite_note-Roberto-113">[99]</a> It may also be possible to probe alternative reaction channels in the same <a href="/wiki/Calcium-48" title="Calcium-48">48Ca</a>-induced fusion-evaporation reactions that populate the most neutron-rich known isotopes, namely those at a lower <a href="/wiki/Excited_state" title="Excited state">excitation</a> energy (resulting in fewer neutrons being emitted during de-excitation), or those involving evaporation of charged particles (pxn, evaporating a proton and several neutrons, or αxn, evaporating an <a href="/wiki/Alpha_particle" title="Alpha particle">alpha particle</a> and several neutrons).<a href="#cite_note-Yerevan2023PPT-114">[100]</a> This may allow the synthesis of neutron-enriched isotopes of elements 111–117.<a href="#cite_note-pxn-115">[101]</a> Although the predicted cross sections are on the order of 1–900 <a href="/wiki/Barn_(unit)" title="Barn (unit)">fb</a>, smaller than when only neutrons are evaporated (xn channels), it may still be possible to generate otherwise unreachable isotopes of superheavy elements in these reactions.<a href="#cite_note-Yerevan2023PPT-114">[100]</a><a href="#cite_note-pxn-115">[101]</a><a href="#cite_note-xsection-116">[102]</a> Some of these heavier isotopes (such as 291Mc, 291Fl, and 291Nh) may also undergo <a href="/wiki/Electron_capture" title="Electron capture">electron capture</a> (converting a proton into a neutron) in addition to alpha decay with relatively long half-lives, decaying to nuclei such as 291Cn that are predicted to lie near the center of the island of stability. However, this remains largely hypothetical as no superheavy nuclei near the beta-stability line have yet been synthesized and predictions of their properties vary considerably across different models.<a href="#cite_note-ZagrebaevPPT-1">[1]</a><a href="#cite_note-Zagrebaev-75">[63]</a> In 2024, a team of researchers at the JINR observed one decay chain of the known isotope 289Mc as a product in the p2n channel of the reaction between 242Pu and 50Ti, an experiment targeting neutron-deficient <a href="/wiki/Isotopes_of_livermorium" title="Isotopes of livermorium">livermorium isotopes</a>. This was the first successful report of a charged-particle exit channel in a hot fusion reaction between an actinide target and a projectile with Z ≥ 20.<a href="#cite_note-jinr2024-117">[103]</a> The process of slow <a href="/wiki/Neutron_capture" title="Neutron capture">neutron capture</a> used to produce nuclides as heavy as 257<a href="/wiki/Fermium" title="Fermium">Fm</a> is blocked by short-lived <a href="/wiki/Isotopes_of_fermium" title="Isotopes of fermium">isotopes of fermium</a> that undergo spontaneous fission (for example, 258Fm has a half-life of 370 μs); this is known as the "fermium gap" and prevents the synthesis of heavier elements in such a reaction. It might be possible to bypass this gap, as well as another predicted region of instability around A = 275 and Z = 104–108, in a series of controlled nuclear explosions with a higher <a href="/wiki/Neutron_flux" title="Neutron flux">neutron flux</a> (about a thousand times greater than fluxes in existing reactors) that mimics the astrophysical r-process.<a href="#cite_note-Zagrebaev-75">[63]</a> First proposed in 1972 by Meldner, such a reaction might enable the production of macroscopic quantities of superheavy elements within the island of stability;<a href="#cite_note-ZagrebaevPPT-1">[1]</a> the role of fission in intermediate superheavy nuclides is highly uncertain, and may strongly influence the yield of such a reaction.<a href="#cite_note-natural-101">[88]</a> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Nuclear_chart_from_KTUY_model.svg" class="mw-file-description"><img alt="JAEA chart of nuclides up to Z = 149 and N = 256 showing predicted decay modes and the beta-stability line" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Nuclear_chart_from_KTUY_model.svg/480px-Nuclear_chart_from_KTUY_model.svg.png" decoding="async" width="480" height="291" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Nuclear_chart_from_KTUY_model.svg/720px-Nuclear_chart_from_KTUY_model.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Nuclear_chart_from_KTUY_model.svg/960px-Nuclear_chart_from_KTUY_model.svg.png 2x" data-file-width="1870" data-file-height="1135" /></a><figcaption>This chart of nuclides used by the Japan Atomic Energy Agency shows known (boxed) and predicted decay modes of nuclei up to Z = 149 and N = 256. Regions of increased stability are visible around the predicted shell closures at N = 184 (294Ds–298Fl) and N = 228 (354126), separated by a gap of short-lived fissioning nuclei (t1/2 < 1 ns; not colored in the chart).<a href="#cite_note-SHlimit-87">[75]</a></figcaption></figure> It may also be possible to generate isotopes in the island of stability such as 298Fl in multi-nucleon <a href="/wiki/Nuclear_reaction#Transfer_reactions" title="Nuclear reaction">transfer reactions</a> in low-energy collisions of <a href="/wiki/Actinide" title="Actinide">actinide</a> nuclei (such as 238U and 248Cm).<a href="#cite_note-Popeko-111">[97]</a> This inverse quasifission (partial fusion followed by fission, with a shift away from mass equilibrium that results in more asymmetric products) mechanism<a href="#cite_note-TDHF-118">[104]</a> may provide a path to the island of stability if shell effects around Z = 114 are sufficiently strong, though lighter elements such as <a href="/wiki/Nobelium" title="Nobelium">nobelium</a> and seaborgium (Z = 102–106) are predicted to have higher yields.<a href="#cite_note-Zagrebaev-75">[63]</a><a href="#cite_note-ZG-119">[105]</a> Preliminary studies of the 238U + 238U and 238U + 248Cm transfer reactions have failed to produce elements heavier than <a href="/wiki/Mendelevium" title="Mendelevium">mendelevium</a> (Z = 101), though the increased yield in the latter reaction suggests that the use of even heavier targets such as 254Es (if available) may enable production of superheavy elements.<a href="#cite_note-Schadel-120">[106]</a> This result is supported by a later calculation suggesting that the yield of superheavy nuclides (with Z ≤ 109) will likely be higher in transfer reactions using heavier targets.<a href="#cite_note-Zhu19-112">[98]</a> A 2018 study of the 238U + 232Th reaction at the <a href="/wiki/Texas_A%26M" class="mw-redirect" title="Texas A&M">Texas A&M</a> Cyclotron Institute by Sara Wuenschel et al. found several unknown alpha decays that may possibly be attributed to new, neutron-rich isotopes of superheavy elements with 104 < Z < 116, though further research is required to unambiguously determine the atomic number of the products.<a href="#cite_note-Zhu19-112">[98]</a><a href="#cite_note-Wuenschel-121">[107]</a> This result strongly suggests that shell effects have a significant influence on cross sections, and that the island of stability could possibly be reached in future experiments with transfer reactions.<a href="#cite_note-Wuenschel-121">[107]</a> <div class="mw-heading mw-heading2"><h2 id="Other_islands_of_stability">Other islands of stability</h2>[<a href="/w/index.php?title=Island_of_stability&action=edit&section=9" title="Edit section: Other islands of stability">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Extended_periodic_table" title="Extended periodic table">Extended periodic table</a></div> Further shell closures beyond the main island of stability in the vicinity of Z = 112–114 may give rise to additional islands of stability. Although predictions for the location of the next magic numbers vary considerably, two significant islands are thought to exist around heavier doubly magic nuclei; the first near 354126 (with 228 neutrons) and the second near 472164 or 482164 (with 308 or 318 neutrons).<a href="#cite_note-quest-37">[34]</a><a href="#cite_note-SHlimit-87">[75]</a><a href="#cite_note-greinernuclei-122">[108]</a> Nuclides within these two islands of stability might be especially resistant to spontaneous fission and have alpha decay half-lives measurable in years, thus having comparable stability to elements in the vicinity of <a href="/wiki/Flerovium" title="Flerovium">flerovium</a>.<a href="#cite_note-quest-37">[34]</a> Other regions of relative stability may also appear with weaker proton shell closures in beta-stable nuclides; such possibilities include regions near 342126<a href="#cite_note-okunev-123">[109]</a> and 462154.<a href="#cite_note-fossilfission-124">[110]</a> Substantially greater <a href="/wiki/Electromagnetic_repulsion" class="mw-redirect" title="Electromagnetic repulsion">electromagnetic repulsion</a> between protons in such heavy nuclei may greatly reduce their stability, and possibly restrict their existence to localized islands in the vicinity of shell effects.<a href="#cite_note-aag-125">[111]</a> This may have the consequence of isolating these islands from the main <a href="/wiki/Chart_of_nuclides" class="mw-redirect" title="Chart of nuclides">chart of nuclides</a>, as intermediate nuclides and perhaps elements in a "sea of instability" would rapidly undergo fission and essentially be nonexistent.<a href="#cite_note-greinernuclei-122">[108]</a> It is also possible that beyond a region of relative stability around element 126, heavier nuclei would lie beyond a fission threshold given by the <a href="/wiki/Liquid_drop_model" class="mw-redirect" title="Liquid drop model">liquid drop model</a> and thus undergo fission with very short lifetimes, rendering them essentially nonexistent even in the vicinity of greater magic numbers.<a href="#cite_note-okunev-123">[109]</a> It has also been posited that in the region beyond A > 300, an entire "<a href="/wiki/Continent_of_stability" title="Continent of stability">continent of stability</a>" consisting of a hypothetical phase of stable <a href="/wiki/Quark_matter" class="mw-redirect" title="Quark matter">quark matter</a>, comprising freely flowing <a href="/wiki/Up_quark" title="Up quark">up</a> and <a href="/wiki/Down_quark" title="Down quark">down</a> quarks rather than <a href="/wiki/Quark" title="Quark">quarks</a> bound into protons and neutrons, may exist. Such a form of matter is theorized to be a ground state of <a href="/wiki/Baryonic_matter" class="mw-redirect" title="Baryonic matter">baryonic matter</a> with a greater binding energy per <a href="/wiki/Baryon" title="Baryon">baryon</a> than <a href="/wiki/Nuclear_matter" title="Nuclear matter">nuclear matter</a>, favoring the decay of nuclear matter beyond this mass threshold into quark matter. If this state of matter exists, it could possibly be synthesized in the same fusion reactions leading to normal superheavy nuclei, and would be stabilized against fission as a consequence of its stronger binding that is enough to overcome Coulomb repulsion.<a href="#cite_note-udQM-126">[112]</a> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2>[<a href="/w/index.php?title=Island_of_stability&action=edit&section=10" title="Edit section: See also">edit</a>]</div> <style data-mw-deduplicate="TemplateStyles:r1239009302">.mw-parser-output .portalbox{padding:0;margin:0.5em 0;display:table;box-sizing:border-box;max-width:175px;list-style:none}.mw-parser-output .portalborder{border:1px solid var(--border-color-base,#a2a9b1);padding:0.1em;background:var(--background-color-neutral-subtle,#f8f9fa)}.mw-parser-output .portalbox-entry{display:table-row;font-size:85%;line-height:110%;height:1.9em;font-style:italic;font-weight:bold}.mw-parser-output .portalbox-image{display:table-cell;padding:0.2em;vertical-align:middle;text-align:center}.mw-parser-output .portalbox-link{display:table-cell;padding:0.2em 0.2em 0.2em 0.3em;vertical-align:middle}@media(min-width:720px){.mw-parser-output .portalleft{clear:left;float:left;margin:0.5em 1em 0.5em 0}.mw-parser-output .portalright{clear:right;float:right;margin:0.5em 0 0.5em 1em}}</style><ul role="navigation" aria-label="Portals" class="noprint portalbox portalborder portalright"> <li class="portalbox-entry"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Radioactive.svg/32px-Radioactive.svg.png" decoding="async" width="32" height="28" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Radioactive.svg/48px-Radioactive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Radioactive.svg/64px-Radioactive.svg.png 2x" data-file-width="512" data-file-height="446" /><a href="/wiki/Portal:Nuclear_technology" title="Portal:Nuclear technology">Nuclear technology portal</a></li><li class="portalbox-entry"><a href="/wiki/File:Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg" class="mw-file-description"><img alt="icon" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg/25px-Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg.png" decoding="async" width="25" height="28" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg/37px-Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg/49px-Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg.png 2x" data-file-width="530" data-file-height="600" /></a><a href="/wiki/Portal:Physics" title="Portal:Physics">physics portal</a></li></ul> <ul><li><a href="/wiki/Island_of_inversion" title="Island of inversion">Island of inversion</a></li> <li><a href="/wiki/Table_of_nuclides" title="Table of nuclides">Table of nuclides</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Notes">Notes</h2>[<a href="/w/index.php?title=Island_of_stability&action=edit&section=11" title="Edit section: Notes">edit</a>]</div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-lower-alpha"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-11"><a href="#cite_ref-11">^</a> The heaviest stable element was believed to be bismuth (atomic number 83) until 2003, when its only stable isotope, <a href="/wiki/Bismuth-209" title="Bismuth-209">209Bi</a>, was observed to undergo alpha decay.<a href="#cite_note-10">[10]</a> </li> <li id="cite_note-13"><a href="#cite_ref-13">^</a> It is theoretically possible for other <a href="/wiki/Observationally_stable" class="mw-redirect" title="Observationally stable">observationally stable</a> nuclides to decay, though their predicted half-lives are so long that this process has never been observed.<a href="#cite_note-bellidecay-12">[11]</a> </li> <li id="cite_note-15"><a href="#cite_ref-15">^</a> A region of increased stability encompasses <a href="/wiki/Thorium" title="Thorium">thorium</a> (Z = 90) and <a href="/wiki/Uranium" title="Uranium">uranium</a> (Z = 92) whose half-lives are comparable to the <a href="/wiki/Age_of_the_Earth" class="mw-redirect" title="Age of the Earth">age of the Earth</a>. Elements intermediate between bismuth and thorium have shorter half-lives, and heavier nuclei beyond uranium become more unstable with increasing atomic number.<a href="#cite_note-greinerVP-14">[12]</a> </li> <li id="cite_note-41"><a href="#cite_ref-41">^</a> Different sources give different values for half-lives; the most recently published values in the literature and NUBASE are both listed for reference. </li> <li id="cite_note-49"><a href="#cite_ref-49">^</a> The unconfirmed 278Bh may have a longer half-life of 11.5 minutes.<a href="#cite_note-Hofmann2016-48">[44]</a> </li> <li id="cite_note-X-53">^ <a href="#cite_ref-X_53-0">a</a> <a href="#cite_ref-X_53-1">b</a> <a href="#cite_ref-X_53-2">c</a> <a href="#cite_ref-X_53-3">d</a> <a href="#cite_ref-X_53-4">e</a> <a href="#cite_ref-X_53-5">f</a> <a href="#cite_ref-X_53-6">g</a> <a href="#cite_ref-X_53-7">h</a> <a href="#cite_ref-X_53-8">i</a> <a href="#cite_ref-X_53-9">j</a> For elements 109–118, the longest-lived known isotope is always the heaviest discovered thus far. This makes it seem likely that there are longer-lived undiscovered isotopes among the even heavier ones.<a href="#cite_note-48Ca-52">[47]</a> </li> <li id="cite_note-54"><a href="#cite_ref-54">^</a> The unconfirmed 282Mt may have a longer half-life of 1.1 minutes.<a href="#cite_note-Hofmann2016-48">[44]</a> </li> <li id="cite_note-55"><a href="#cite_ref-55">^</a> The unconfirmed 286Rg may have a longer half-life of 10.7 minutes.<a href="#cite_note-Hofmann2016-48">[44]</a> </li> <li id="cite_note-56"><a href="#cite_ref-56">^</a> The unconfirmed 290Fl may have a longer half-life of 19 seconds.<a href="#cite_note-Hofmann2016-48">[44]</a> </li> <li id="cite_note-microsec-64">^ <a href="#cite_ref-microsec_64-0">a</a> <a href="#cite_ref-microsec_64-1">b</a> While such nuclei may be synthesized and a <a href="/wiki/Decay_chain" title="Decay chain">series</a> of decay signals may be registered, decays faster than one microsecond may pile up with subsequent signals and thus be indistinguishable, especially when multiple uncharacterized nuclei may be formed and emit a series of similar alpha particles.<a href="#cite_note-Np223-90">[77]</a> The main difficulty is thus attributing the decays to the correct <a href="/wiki/Parent_nuclide" class="mw-redirect" title="Parent nuclide">parent nucleus</a>, as a superheavy atom that decays before reaching the detector will not be registered at all.<a href="#cite_note-Palenzuela-91">[78]</a> </li> <li id="cite_note-67"><a href="#cite_ref-67">^</a> This is a distinct concept from hypothetical fusion near room temperature (<a href="/wiki/Cold_fusion" title="Cold fusion">cold fusion</a>); it instead refers to fusion reactions with lower excitation energy. </li> <li id="cite_note-70"><a href="#cite_ref-70">^</a> Oganessian stated that element 114 would have a half-life on the order of 10−19 s in the absence of stabilizing effects in the vicinity of the theorized island.<a href="#cite_note-whatittakes-69">[58]</a> </li> <li id="cite_note-89"><a href="#cite_ref-89">^</a> The <a href="/wiki/International_Union_of_Pure_and_Applied_Chemistry" title="International Union of Pure and Applied Chemistry">International Union of Pure and Applied Chemistry</a> (IUPAC) defines the limit of nuclear existence at a half-life of 10−14 seconds; this is approximately the time required for nucleons to arrange themselves into nuclear shells and thus form a nuclide.<a href="#cite_note-88">[76]</a> </li> <li id="cite_note-106"><a href="#cite_ref-106">^</a> The observation of long-lived isotopes of <a href="/wiki/Roentgenium" title="Roentgenium">roentgenium</a> (with A = 261, 265) and <a href="/wiki/Unbibium" title="Unbibium">unbibium</a> (A = 292) in nature has been claimed by Israeli physicist <a href="/wiki/Amnon_Marinov" title="Amnon Marinov">Amnon Marinov</a> et al.,<a href="#cite_note-rg2009-103">[90]</a><a href="#cite_note-arxiv122-104">[91]</a> though evaluations of the technique used and subsequent unsuccessful searches cast considerable doubt on these results.<a href="#cite_note-emsley-61">[52]</a><a href="#cite_note-nat-scint-105">[92]</a> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2>[<a href="/w/index.php?title=Island_of_stability&action=edit&section=12" title="Edit section: References">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239543626"><div class="reflist reflist-columns references-column-width" style="column-width: 30em;"> <ol class="references"> <li id="cite_note-ZagrebaevPPT-1">^ <a href="#cite_ref-ZagrebaevPPT_1-0">a</a> <a href="#cite_ref-ZagrebaevPPT_1-1">b</a> <a href="#cite_ref-ZagrebaevPPT_1-2">c</a> <a href="#cite_ref-ZagrebaevPPT_1-3">d</a> <style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFZagrebaev2012" class="citation conference cs1">Zagrebaev, V. (2012). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20160303235203/http://cyclotron.tamu.edu/nn2012/Slides/Plenary/NNC_2012_Zagrebaev.ppt">Opportunities for synthesis of new superheavy nuclei (What really can be done within the next few years)</a>. 11th International Conference on Nucleus-Nucleus Collisions (NN2012). San Antonio, Texas, US. pp. 24–28. Archived from <a rel="nofollow" class="external text" href="http://cyclotron.tamu.edu/nn2012/Slides/Plenary/NNC_2012_Zagrebaev.ppt">the original</a> on 3 March 2016.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=conference&rft.btitle=Opportunities+for+synthesis+of+new+superheavy+nuclei+%28What+really+can+be+done+within+the+next+few+years%29&rft.place=San+Antonio%2C+Texas%2C+US&rft.pages=24-28&rft.date=2012&rft.aulast=Zagrebaev&rft.aufirst=V.&rft_id=http%3A%2F%2Fcyclotron.tamu.edu%2Fnn2012%2FSlides%2FPlenary%2FNNC_2012_Zagrebaev.ppt&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsland+of+stability" class="Z3988"> </li> <li id="cite_note-KarpovSHE-2">^ <a href="#cite_ref-KarpovSHE_2-0">a</a> <a href="#cite_ref-KarpovSHE_2-1">b</a> <a href="#cite_ref-KarpovSHE_2-2">c</a> <a href="#cite_ref-KarpovSHE_2-3">d</a> <a href="#cite_ref-KarpovSHE_2-4">e</a> <a href="#cite_ref-KarpovSHE_2-5">f</a> <a href="#cite_ref-KarpovSHE_2-6">g</a> <a href="#cite_ref-KarpovSHE_2-7">h</a> <a href="#cite_ref-KarpovSHE_2-8">i</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKarpovZagrebaevPalenzuelaRuiz2012" class="citation journal cs1">Karpov, A. 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Physical Review Letters. 120 (1): 222001-1–222001-6. <a href="/wiki/ArXiv_(identifier)" class="mw-redirect" title="ArXiv (identifier)">arXiv</a>:<a rel="nofollow" class="external text" href="https://arxiv.org/abs/1707.06610">1707.06610</a>. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2018PhRvL.120v2001H">2018PhRvL.120v2001H</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1103%2FPhysRevLett.120.222001">10.1103/PhysRevLett.120.222001</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/29906186">29906186</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:49216916">49216916</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Physical+Review+Letters&rft.atitle=Quark+matter+may+not+be+strange&rft.volume=120&rft.issue=1&rft.pages=222001-1-222001-6&rft.date=2018&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A49216916%23id-name%3DS2CID&rft_id=info%3Abibcode%2F2018PhRvL.120v2001H&rft_id=info%3Aarxiv%2F1707.06610&rft_id=info%3Apmid%2F29906186&rft_id=info%3Adoi%2F10.1103%2FPhysRevLett.120.222001&rft.aulast=Holdom&rft.aufirst=B.&rft.au=Ren%2C+J.&rft.au=Zhang%2C+C.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsland+of+stability" class="Z3988"> </li> </ol></div> <div class="mw-heading mw-heading3"><h3 id="Bibliography">Bibliography</h3>[<a href="/w/index.php?title=Island_of_stability&action=edit&section=13" title="Edit section: Bibliography">edit</a>]</div> <style data-mw-deduplicate="TemplateStyles:r1239549316">.mw-parser-output .refbegin{margin-bottom:0.5em}.mw-parser-output .refbegin-hanging-indents>ul{margin-left:0}.mw-parser-output .refbegin-hanging-indents>ul>li{margin-left:0;padding-left:3.2em;text-indent:-3.2em}.mw-parser-output .refbegin-hanging-indents ul,.mw-parser-output .refbegin-hanging-indents ul li{list-style:none}@media(max-width:720px){.mw-parser-output .refbegin-hanging-indents>ul>li{padding-left:1.6em;text-indent:-1.6em}}.mw-parser-output .refbegin-columns{margin-top:0.3em}.mw-parser-output .refbegin-columns ul{margin-top:0}.mw-parser-output .refbegin-columns li{page-break-inside:avoid;break-inside:avoid-column}@media screen{.mw-parser-output .refbegin{font-size:90%}}</style><div class="refbegin" style=""> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFEmsley2011" class="citation book cs1">Emsley, J. (2011). Nature's Building Blocks: An A-Z Guide to the Elements (New ed.). Oxford University Press. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-19-960563-7" title="Special:BookSources/978-0-19-960563-7"><bdi>978-0-19-960563-7</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Nature%27s+Building+Blocks%3A+An+A-Z+Guide+to+the+Elements&rft.edition=New&rft.pub=Oxford+University+Press&rft.date=2011&rft.isbn=978-0-19-960563-7&rft.aulast=Emsley&rft.aufirst=J.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsland+of+stability" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHoffman2000" class="citation book cs1"><a href="/wiki/Darleane_C._Hoffman" title="Darleane C. Hoffman">Hoffman, D. C.</a>; <a href="/wiki/Albert_Ghiorso" title="Albert Ghiorso">Ghiorso, A.</a>; Seaborg, G. T. (2000). The Transuranium People: The Inside Story. World Scientific. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-78326-244-1" title="Special:BookSources/978-1-78326-244-1"><bdi>978-1-78326-244-1</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Transuranium+People%3A+The+Inside+Story&rft.pub=World+Scientific&rft.date=2000&rft.isbn=978-1-78326-244-1&rft.aulast=Hoffman&rft.aufirst=D.+C.&rft.au=Ghiorso%2C+A.&rft.au=Seaborg%2C+G.+T.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsland+of+stability" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKragh2018" class="citation book cs1">Kragh, H. (2018). From Transuranic to Superheavy Elements: A Story of Dispute and Creation. Springer. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-3-319-75813-8" title="Special:BookSources/978-3-319-75813-8"><bdi>978-3-319-75813-8</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=From+Transuranic+to+Superheavy+Elements%3A+A+Story+of+Dispute+and+Creation&rft.pub=Springer&rft.date=2018&rft.isbn=978-3-319-75813-8&rft.aulast=Kragh&rft.aufirst=H.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsland+of+stability" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFLodhi1978" class="citation book cs1">Lodhi, M. A. K., ed. (1978). Superheavy Elements: Proceedings of the International Symposium on Superheavy Elements. Pergamon Press. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-08-022946-1" title="Special:BookSources/978-0-08-022946-1"><bdi>978-0-08-022946-1</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Superheavy+Elements%3A+Proceedings+of+the+International+Symposium+on+Superheavy+Elements&rft.pub=Pergamon+Press&rft.date=1978&rft.isbn=978-0-08-022946-1&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsland+of+stability" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPodgorsak2016" class="citation book cs1">Podgorsak, E. B. (2016). Radiation physics for medical physicists (3rd ed.). Springer. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-3-319-25382-4" title="Special:BookSources/978-3-319-25382-4"><bdi>978-3-319-25382-4</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Radiation+physics+for+medical+physicists&rft.edition=3rd&rft.pub=Springer&rft.date=2016&rft.isbn=978-3-319-25382-4&rft.aulast=Podgorsak&rft.aufirst=E.+B.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsland+of+stability" class="Z3988"></li></ul> </div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2>[<a href="/w/index.php?title=Island_of_stability&action=edit&section=14" title="Edit section: External links">edit</a>]</div> <ul><li><a rel="nofollow" class="external text" href="https://www.nature.com/articles/442876a">Island ahoy!</a> (Nature, 2006, with JINR diagram of heavy nuclides and predicted island of stability)</li> <li><a rel="nofollow" class="external text" href="http://curious.astro.cornell.edu/physics/85-the-universe/supernovae/general-questions/198-can-superheavy-elements-such-as-z-116-or-118-be-formed-in-a-supernova-can-we-observe-them-advanced">Can superheavy elements (such as Z = 116 or 118) be formed in a supernova? Can we observe them?</a> (Cornell, 2004 – "maybe")</li> <li><a rel="nofollow" class="external text" href="http://cerncourier.com/cws/article/cern/28509">Second postcard from the island of stability</a> (CERN, 2001; nuclides with 116 protons and mass 292)</li> <li><a rel="nofollow" class="external text" href="http://cerncourier.com/cws/article/cern/28067">First postcard from the island of nuclear stability</a> (CERN, 1999; first few Z = 114 atoms)</li></ul>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Island_of_stability&oldid=1256689926">https://en.wikipedia.org/w/index.php?title=Island_of_stability&oldid=1256689926</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:Isotopes" title="Category:Isotopes">Isotopes</a></li><li><a href="/wiki/Category:Periodic_table" title="Category:Periodic table">Periodic table</a></li><li><a href="/wiki/Category:Hypothetical_chemical_elements" title="Category:Hypothetical chemical elements">Hypothetical chemical elements</a></li><li><a href="/wiki/Category:Radioactivity" title="Category:Radioactivity">Radioactivity</a></li><li><a href="/wiki/Category:Nuclear_physics" title="Category:Nuclear physics">Nuclear physics</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Articles_with_short_description" title="Category:Articles with short description">Articles with short description</a></li><li><a href="/wiki/Category:Short_description_is_different_from_Wikidata" title="Category:Short description is different from Wikidata">Short description is different from Wikidata</a></li><li><a href="/wiki/Category:Use_American_English_from_October_2019" title="Category:Use American English from October 2019">Use American English from October 2019</a></li><li><a href="/wiki/Category:All_Wikipedia_articles_written_in_American_English" title="Category:All Wikipedia articles written in American English">All Wikipedia articles written in American English</a></li><li><a href="/wiki/Category:Use_dmy_dates_from_March_2020" title="Category:Use dmy dates from March 2020">Use dmy dates from March 2020</a></li><li><a href="/wiki/Category:Articles_containing_potentially_dated_statements_from_2019" title="Category:Articles containing potentially dated statements from 2019">Articles containing potentially dated statements from 2019</a></li><li><a href="/wiki/Category:All_articles_containing_potentially_dated_statements" title="Category:All articles containing potentially dated statements">All articles containing potentially dated statements</a></li><li><a href="/wiki/Category:Articles_containing_potentially_dated_statements_from_2022" title="Category:Articles containing potentially dated statements from 2022">Articles containing potentially dated statements from 2022</a></li><li><a href="/wiki/Category:Featured_articles" title="Category:Featured articles">Featured articles</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 11 November 2024, at 03:29 (UTC).</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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[\"CITEREFChowdhurySamantaBasu2008\"] = 4,\n [\"CITEREFClery2021\"] = 1,\n [\"CITEREFCourtland2010\"] = 1,\n [\"CITEREFDumé2005\"] = 1,\n [\"CITEREFDvořákBrüchleChelnokovDressler2006\"] = 1,\n [\"CITEREFEbbingGammon2007\"] = 1,\n [\"CITEREFEmsley2011\"] = 1,\n [\"CITEREFGiulianiMathesonNazarewicz2019\"] = 1,\n [\"CITEREFGreiner2012\"] = 1,\n [\"CITEREFGreiner2013\"] = 1,\n [\"CITEREFGsponerHurni2009\"] = 1,\n [\"CITEREFHeßbergerAckermann2017\"] = 1,\n [\"CITEREFHoffman2000\"] = 1,\n [\"CITEREFHofmannHeinzMannMaurer2016\"] = 1,\n [\"CITEREFHoldomRenZhang2018\"] = 1,\n [\"CITEREFHongAdamianAntonenko2017\"] = 1,\n [\"CITEREFHongAdamianAntonenkoJachimowicz2023\"] = 1,\n [\"CITEREFIbadullayev2024\"] = 1,\n [\"CITEREFKarpovZagrebaevGreiner2015\"] = 1,\n [\"CITEREFKarpovZagrebaevPalenzuelaRuiz2012\"] = 1,\n [\"CITEREFKhuyagbaatar2017\"] = 1,\n [\"CITEREFKoura2011\"] = 1,\n [\"CITEREFKouraChiba2013\"] = 1,\n [\"CITEREFKouraKatakuraTachibanaMinato2015\"] = 1,\n [\"CITEREFKragh2017\"] = 1,\n [\"CITEREFKragh2018\"] = 1,\n [\"CITEREFKratz2011\"] = 1,\n [\"CITEREFLodhi1978\"] = 1,\n [\"CITEREFLudwigFaestermannKorschinekRugel2012\"] = 1,\n [\"CITEREFMalovAdamianAntonenkoLenske2021\"] = 1,\n [\"CITEREFMalyWalz1980\"] = 1,\n [\"CITEREFMarcillacCoronDambierLeblanc2003\"] = 1,\n [\"CITEREFMarinovRodushkin,_I.Kolb,_D.Pape,_A.2010\"] = 1,\n [\"CITEREFMarinovRodushkinPapeKashiv2009\"] = 1,\n [\"CITEREFMengLuZhou2020\"] = 1,\n [\"CITEREFMoody2014\"] = 1,\n [\"CITEREFMoskowitz2014\"] = 1,\n [\"CITEREFMöller2016\"] = 1,\n [\"CITEREFMöllerNix1998\"] = 1,\n [\"CITEREFNave\"] = 1,\n [\"CITEREFNilssonTsangSobiczewski1969\"] = 1,\n [\"CITEREFOganessian2007\"] = 1,\n [\"CITEREFOganessian2012\"] = 1,\n [\"CITEREFOganessianAbdullinBaileyBenker2010\"] = 1,\n [\"CITEREFOganessianRykaczewski2015\"] = 1,\n [\"CITEREFOganessianUtyonkov2015\"] = 1,\n [\"CITEREFOganessianUtyonkovIbadullayev2022\"] = 1,\n [\"CITEREFOganessianUtyonkovKovrizhnykh2022\"] = 1,\n [\"CITEREFOganessianUtyonkovKovrizhnykhAbdullin2022\"] = 1,\n [\"CITEREFOganessianUtyonkovLobanov1999\"] = 1,\n [\"CITEREFOkunev2018\"] = 1,\n [\"CITEREFPalenzuelaRuizKarpovGreiner2012\"] = 1,\n [\"CITEREFPatykSobiczewski1991\"] = 1,\n [\"CITEREFPetermannLangankeMartínez-PinedoPanov2012\"] = 1,\n [\"CITEREFPodgorsak2016\"] = 1,\n [\"CITEREFPoenaruGherghescuGreiner2011\"] = 1,\n [\"CITEREFPopeko2016\"] = 1,\n [\"CITEREFRoberto2015\"] = 1,\n [\"CITEREFRoberts2019\"] = 1,\n [\"CITEREFSacks2004\"] = 1,\n [\"CITEREFSamantaBasuChowdhury2007\"] = 1,\n [\"CITEREFSamantaChowdhuryBasu2007\"] = 1,\n [\"CITEREFSarriguren2019\"] = 1,\n [\"CITEREFSatake2010\"] = 1,\n [\"CITEREFSchädel2015\"] = 1,\n [\"CITEREFSchädel2016\"] = 1,\n [\"CITEREFSekizawa2019\"] = 1,\n [\"CITEREFSiwek-WilczyńskaCapKowal2019\"] = 1,\n [\"CITEREFSunLiuHuang2017\"] = 1,\n [\"CITEREFSåmark-RothCoxRudolphSarmento2021\"] = 1,\n [\"CITEREFTerranovaTavares2022\"] = 1,\n [\"CITEREFThoennessen2018\"] = 1,\n [\"CITEREFThompsonTsang1972\"] = 1,\n [\"CITEREFUtyonkovBrewerOganessianRykaczewski2018\"] = 1,\n [\"CITEREFV._A._DzubaV._V._FlambaumJ._K._Webb2017\"] = 1,\n [\"CITEREFWuenschelHagelBarbuiGauthier2018\"] = 1,\n [\"CITEREFZagrebaev2012\"] = 1,\n [\"CITEREFZagrebaevAritomoItkisOganessian2001\"] = 1,\n [\"CITEREFZagrebaevGreiner2008\"] = 1,\n [\"CITEREFZagrebaevKarpovGreiner2013\"] = 1,\n [\"CITEREFZhu2019\"] = 1,\n [\"CITEREFĆwiokHeenenNazarewicz2005\"] = 1,\n [\"CITEREFĆwiokNazarewiczHeenen1999\"] = 1,\n}\ntemplate_list = table#1 {\n [\"=\"] = 2,\n [\"As of\"] = 2,\n [\"Cite arXiv\"] = 2,\n [\"Cite book\"] = 10,\n [\"Cite conference\"] = 6,\n [\"Cite journal\"] = 65,\n [\"Cite magazine\"] = 1,\n [\"Cite news\"] = 5,\n [\"Cite report\"] = 1,\n [\"Cite web\"] = 12,\n [\"Efn\"] = 24,\n [\"Featured article\"] = 1,\n [\"For\"] = 1,\n [\"Harvid\"] = 1,\n [\"Harvnb\"] = 15,\n [\"NUBASE2020\"] = 3,\n [\"Nobr\"] = 1,\n [\"Notelist\"] = 1,\n [\"Nuclear physics\"] = 1,\n [\"Portal\"] = 1,\n [\"Refbegin\"] = 1,\n [\"Refend\"] = 1,\n [\"Reflist\"] = 1,\n [\"See also\"] = 3,\n [\"Short description\"] = 1,\n [\"Su\"] = 2,\n [\"Sup\"] = 4,\n [\"Use American English\"] = 1,\n [\"Use dmy dates\"] = 1,\n [\"Val\"] = 1,\n}\narticle_whitelist = table#1 {\n}\n","limitreport-profile":[["MediaWiki\\Extension\\Scribunto\\Engines\\LuaSandbox\\LuaSandboxCallback::callParserFunction","140","14.0"],["?","120","12.0"],["MediaWiki\\Extension\\Scribunto\\Engines\\LuaSandbox\\LuaSandboxCallback::gsub","120","12.0"],["MediaWiki\\Extension\\Scribunto\\Engines\\LuaSandbox\\LuaSandboxCallback::find","100","10.0"],["\u003Cmw.lua:694\u003E","80","8.0"],["dataWrapper \u003Cmw.lua:672\u003E","60","6.0"],["MediaWiki\\Extension\\Scribunto\\Engines\\LuaSandbox\\LuaSandboxCallback::sub","60","6.0"],["type","40","4.0"],["(for generator) \u003Cmw.lua:684\u003E","40","4.0"],["MediaWiki\\Extension\\Scribunto\\Engines\\LuaSandbox\\LuaSandboxCallback::match","40","4.0"],["[others]","200","20.0"]]},"cachereport":{"origin":"mw-web.codfw.main-6b7f745dd4-z527z","timestamp":"20241125133536","ttl":2592000,"transientcontent":false}}});});</script> <script type="application/ld+json">{"@context":"https:\/\/schema.org","@type":"Article","name":"Island of stability","url":"https:\/\/en.wikipedia.org\/wiki\/Island_of_stability","sameAs":"http:\/\/www.wikidata.org\/entity\/Q11774759","mainEntity":"http:\/\/www.wikidata.org\/entity\/Q11774759","author":{"@type":"Organization","name":"Contributors to Wikimedia projects"},"publisher":{"@type":"Organization","name":"Wikimedia Foundation, Inc.","logo":{"@type":"ImageObject","url":"https:\/\/www.wikimedia.org\/static\/images\/wmf-hor-googpub.png"}},"datePublished":"2002-07-31T22:59:28Z","dateModified":"2024-11-11T03:29:57Z","image":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/8\/89\/Island_of_Stability_derived_from_Zagrebaev.svg","headline":"region of the chart of the nuclides containing isotopes of super-heavy elements theorized to be much more stable than others"}</script> </body> </html>