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The structure of neutron-deficient isotopes up to $^{210}$Po ($N=126$) is well established as they are easily produced through various methods. However, there is not much information available for the neutron-rich counterparts for which only selective techniques can be used for their production. We report on the first fast-timing measurements of yrast states up to the 8$^+$ level in $^{214,216,218}$Po isotopes produced in the $\beta^-$ decay of $^{214,216,218}$Bi at ISOLDE, CERN. In particular, our new half-life value of 607(14) ps for the 8$_1^+$ state in $^{214}$Po is nearly 20 times shorter than the one available in literature and comparable with the newly measured half-lives of 409(16) and 628(25) ps for the corresponding 8$_1^+$ states in $^{216,218}$Po, respectively. The measured $B(E2;8_1^+ \to 6_1^+)$ transition probability values follow an increasing trend relative to isotope mass, reaching a maximum for $^{216}$Po. The increase contradicts the previous claims of isomerism for the $8^+$ yrast states in neutron-rich $^{214}$Po and beyond. Together with the other measured yrast transitions, the $B(E2)$ values provide a crucial test of the different theoretical approaches describing the underlying configurations of the yrast band. The new experimental results are compared to shell-model calculations using the KHPE and H208 effective interactions and their pairing modified versions, showing an increase in configuration mixing when moving towards the heavier isotopes. Lică, R.; Andreyev, A.N.; Naïdja, H.; Blazhev, A.; Van Duppen, P.; Andel, B.; Algora, A.; Antalic, S.; Benito, J.; Benzoni, G.; Berry, T.; Borge, M.J.G.; Costache, C.; Cubiss, J.G.; De Witte, H.; Fraile, L.M.; Fynbo, H.O.U.; Greenlees, P.T.; Harkness-Brennan, L.J.; Huyse, M.; Illana, A.; Jolie, J.; Judson, D.S.; Konki, J.; Lazarus, I.; Madurga, M.; Marginean, N.; Marginean, R.; Mihai, C.; Mihai, R.E.; Mosat, P.; Murias, J.R.; Nacher, E.; Negret, A.; Page, R.D.; Perea, A.; Pucknell, V.; Rahkila, P.; Rezynkina, K.; Sánchez-Tembleque, V.; Schomacker, K.; Stryjczyk, M.; Sürder, C.; Tengblad, O.; Vedia, V.; Warr, N." /> <meta name="keywords" content="CERN Document Server, WebSearch, CERN Document Server" /> <script type="text/javascript" src="https://cds.cern.ch/js/jquery.min.js"></script>  <link rel="stylesheet" href="https://cds.cern.ch/img/webnews.css" type="text/css" />  <script type="text/javascript" src="https://cds.cern.ch/js/webnews.js?v=20131009"></script> <meta property="fb:app_id" content="137353533001720"/> <script type="text/x-mathjax-config"> MathJax.Hub.Config({ tex2jax: {inlineMath: [['$','$']], processEscapes: true}, showProcessingMessages: false, messageStyle: "none" }); </script> <script src="/MathJax/MathJax.js?config=TeX-AMS_CHTML" type="text/javascript"> </script>  <meta content="arXiv : On the nature of yrast states in neutron-rich polonium isotopes" name="citation_title" /> <meta content="Lică, R." name="citation_author" /> <meta content="Costache, C." name="citation_author" /> <meta content="Andel, B." name="citation_author" /> <meta content="Mosat, P." name="citation_author" /> <meta content="Judson, D.S." name="citation_author" /> <meta content="Sürder, C." name="citation_author" /> <meta content="Nacher, E." name="citation_author" /> <meta content="Konki, J." name="citation_author" /> <meta content="Antalic, S." name="citation_author" /> <meta content="Algora, A." name="citation_author" /> <meta content="Page, R.D." name="citation_author" /> <meta content="Mihai, R.E." name="citation_author" /> <meta content="Greenlees, P.T." name="citation_author" /> <meta content="Naïdja, H." name="citation_author" /> <meta content="Schomacker, K." name="citation_author" /> <meta content="Harkness-Brennan, L.J." name="citation_author" /> <meta content="Warr, N." name="citation_author" /> <meta content="Rezynkina, K." name="citation_author" /> <meta content="Fynbo, H.O.U." name="citation_author" /> <meta content="Cubiss, J.G." name="citation_author" /> <meta content="Mihai, C." name="citation_author" /> <meta content="Jolie, J." name="citation_author" /> <meta content="Tengblad, O." name="citation_author" /> <meta content="Madurga, M." name="citation_author" /> <meta content="Blazhev, A." name="citation_author" /> <meta content="Marginean, R." name="citation_author" /> <meta content="De Witte, H." name="citation_author" /> <meta content="Van Duppen, P." name="citation_author" /> <meta content="Sánchez-Tembleque, V." name="citation_author" /> <meta content="Stryjczyk, M." name="citation_author" /> <meta content="Benzoni, G." name="citation_author" /> <meta content="Illana, A." name="citation_author" /> <meta content="Andreyev, A.N." name="citation_author" /> <meta content="Murias, J.R." name="citation_author" /> <meta content="Huyse, M." name="citation_author" /> <meta content="Borge, M.J.G." name="citation_author" /> <meta content="Perea, A." name="citation_author" /> <meta content="Marginean, N." name="citation_author" /> <meta content="Fraile, L.M." name="citation_author" /> <meta content="Benito, J." name="citation_author" /> <meta content="Lazarus, I." name="citation_author" /> <meta content="Pucknell, V." name="citation_author" /> <meta content="Rahkila, P." name="citation_author" /> <meta content="Negret, A." name="citation_author" /> <meta content="Vedia, V." name="citation_author" /> <meta content="Berry, T." name="citation_author" /> <meta content="2024/07/04" name="citation_publication_date" /> <meta name="citation_online_date" content="2024/07/18"> <meta content="arXiv:2407.03839" name="citation_technical_report_number" /> <meta name="citation_pdf_url" content="https://cds.cern.ch/record/2904769/files/2407.03839.pdf" />  <meta content="On the nature of yrast states in neutron-rich polonium isotopes" property="og:title" /> <meta content="arXiv" property="og:title" /> <meta content="website" property="og:type" /> <meta content="https://cds.cern.ch/record/2904769" property="og:url" /> <meta name="twitter:image" content="https://cds.cern.ch/record/2904769/files/wf.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2904769/files/wf.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2904769/files/wf.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2904769/files/graph_halflives.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2904769/files/graph_halflives.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2904769/files/fig_ids_theory_210-218.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2904769/files/fig_ids_theory_210-218.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2904769/files/graph_spectra.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2904769/files/graph_spectra.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2904769/files/Po.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2904769/files/Po.png" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="arXiv" property="og:description" /> <meta content="Polonium isotopes having two protons above the shell closure at $Z=82$ show a wide variety of low-lying high-spin isomeric states across the whole chain. The structure of neutron-deficient isotopes up to $^{210}$Po ($N=126$) is well established as they are easily produced through various methods. However, there is not much information available for the neutron-rich counterparts for which only selective techniques can be used for their production. We report on the first fast-timing measurements of yrast states up to the 8$^+$ level in $^{214,216,218}$Po isotopes produced in the $\beta^-$ decay of $^{214,216,218}$Bi at ISOLDE, CERN. In particular, our new half-life value of 607(14) ps for the 8$_1^+$ state in $^{214}$Po is nearly 20 times shorter than the one available in literature and comparable with the newly measured half-lives of 409(16) and 628(25) ps for the corresponding 8$_1^+$ states in $^{216,218}$Po, respectively. The measured $B(E2;8_1^+ \to 6_1^+)$ transition probability values follow an increasing trend relative to isotope mass, reaching a maximum for $^{216}$Po. The increase contradicts the previous claims of isomerism for the $8^+$ yrast states in neutron-rich $^{214}$Po and beyond. Together with the other measured yrast transitions, the $B(E2)$ values provide a crucial test of the different theoretical approaches describing the underlying configurations of the yrast band. The new experimental results are compared to shell-model calculations using the KHPE and H208 effective interactions and their pairing modified versions, showing an increase in configuration mixing when moving towards the heavier isotopes." property="og:description" />  <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="CERN32Document32Server search" lang="pl">  <div id="cern-toolbar"> <h1><a href="http://cern.ch" title="CERN">CERN <span>Accelerating science</span></a></h1> <ul> <li class="cern-accountlinks"><a class="cern-account" href="https://cds.cern.ch/youraccount/login?ln=pl&referer=https%3A//cds.cern.ch/record/2904769%3Fln%3Dpl" title="Sign in to your CERN account">Sign in</a></li> <li><a class="cern-directory" href="http://cern.ch/directory" title="Search CERN resources and browse the directory">Directory</a></li> </ul> </div>   <div role="banner" class="clearfix" id="header"> <div class="header-inner inner"> <hgroup class="clearfix"> <h2 id="site-name"> <a rel="home" title="Home" href="/"><span>CERN Document Server</span></a> </h2> <h3 id="site-slogan">Access articles, reports and multimedia content in HEP</h3> </hgroup> <div role="navigation" id="main-navigation" class="cdsmenu"> <h2 class="element-invisible">Main menu</h2><ul class="links inline clearfix"> <li class="menu-386 first active-trail"><a class="active-trail" href="https://cds.cern.ch/?ln=pl">Szukaj</a></li> <li class="menu-444 "><a class="" title="" href="https://cds.cern.ch/submit?ln=pl">Dodaj</a></li> <li class="menu-426 "><a class="" href="https://cds.cern.ch/help/?ln=pl">Pomoc</a></li> <li class="leaf hassubcdsmenu"> <a hreflang="en" class="header" href="https://cds.cern.ch/youraccount/display?ln=pl">Ustawienia</a> <ul class="subsubcdsmenu"><li><a href="https://cds.cern.ch/youralerts/list?ln=pl">Your alerts</a></li><li><a href="https://cds.cern.ch/yourbaskets/display?ln=pl">Your baskets</a></li><li><a href="https://cds.cern.ch/yourcomments?ln=pl">Your comments</a></li><li><a href="https://cds.cern.ch/youralerts/display?ln=pl">Your searches</a></li></ul></li> </ul> </div> </div> </div>  <table class="navtrailbox"> <tr> <td class="navtrailboxbody"> <a href="/?ln=pl" class="navtrail">Główna</a> > On the nature of yrast states in neutron-rich polonium isotopes </td> </tr> </table> </div> <div class="pagebody"><div class="pagebodystripemiddle"> <div class="detailedrecordbox"> <div class="detailedrecordtabs"> <div> <ul class="detailedrecordtabs"><li class="on first"><a href="/record/2904769/?ln=pl">Informacja </a></li><li class=""><a href="/record/2904769/files?ln=pl">Files </a></li></ul> <div id="tabsSpacer" style="clear:both;height:0px"> </div></div> </div> <div class="detailedrecordboxcontent"> <div class="top-left-folded"></div> <div class="top-right-folded"></div> <div class="inside">  <abbr class="unapi-id" title="2904769"></abbr>  <link href="/img/download_and_embed_buttons.css" rel="stylesheet" type="text/css" /> <style type="text/css">  .video_talk_wrapper{ max-width: 640px; min-height: 360px; } </style> <table class="formatRecordTableFullWidth"> <tr> <td class="formatRecordHeader" style="background-image: url('/img/journals.jpg');" colspan="2">  Preprint </td> </tr> <tr><td class="formatRecordLabel"> Report number </td><td style="padding-left:5px;"><a href="http://arxiv.org/abs/arXiv:2407.03839">arXiv:2407.03839</a></td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>On the nature of yrast states in neutron-rich polonium isotopes</b></td></tr> <style> .video_control_container, #video_controlbutton { display: none; }#video_detailbox_download {display: none;}#video_detailbox_embed {display: none;}</style> <div class="video_control_container"> <div style="box-sizing: inherit;position: relative;min-height: 1em;margin: 1em 0;background: #f8f8f9;padding: 1em 1.5em;line-height: 1.4285em;transition: opacity .1s ease,color .1s ease,background .1s ease,box-shadow .1s ease,-webkit-box-shadow .1s ease;border-radius: .28571429rem;font-size: 1.1em;margin-top: 0;margin-bottom: 6px;background-color: #f8ffff;color: #276f86;box-shadow: 0 0 0 1px #a9d5de inset,0 0 0 0 transparent;"> <i class="fa fa-info"></i><span style="padding-left: 9px;">If you experience any problem watching the video, click the download button below</span> </div> <a id="video_controlbutton_download" rel="download_button" class="video_controlbutton" href="#">Download</a> <a id="video_controlbutton_embed" class="video_controlbutton" href="#">Embed</a> </div> <div id="video_detailbox_download" style="margin:10px"> </div> <div id="video_detailbox_embed" style="margin:10px"> </div> <tr><td class="formatRecordLabel"> <span style="white-space:nowrap;">Author(s)</span> </td><td style="padding-left:5px;"> <script type="text/javascript"> function toggle_authors_visibility(){ var more = document.getElementById('more'); var link = document.getElementById('link'); var extension = document.getElementById('extension'); if (more.style.display=='none'){ more.style.display = ''; extension.style.display = 'none'; link.innerHTML = "Ukryj" } else { more.style.display = 'none'; extension.style.display = ''; link.innerHTML = "Pokaż wszystkich 46 autorów" } link.style.color = "rgb(204,0,0);" } function set_up(){ var extension = document.getElementById('extension'); extension.innerHTML = "IDS Collaboration "; toggle_authors_visibility(); } </script> <a name="show_hide" /><p id="more" style=""><a href="https://cds.cern.ch/search?f=author&p=Lic%C4%83%2C%20R.&ln=pl">Lică, R.</a> (Bucharest, IFIN-HH) ; <a href="https://cds.cern.ch/search?f=author&p=Andreyev%2C%20A.N.&ln=pl">Andreyev, A.N.</a> (York U., England) ; <a href="https://cds.cern.ch/search?f=author&p=Na%C3%AFdja%2C%20H.&ln=pl">Naïdja, H.</a> (Constantine U.) ; <a href="https://cds.cern.ch/search?f=author&p=Blazhev%2C%20A.&ln=pl">Blazhev, A.</a> (Cologne U.) ; <a href="https://cds.cern.ch/search?f=author&p=Van%20Duppen%2C%20P.&ln=pl">Van Duppen, P.</a> (Leuven U.) ; <a href="https://cds.cern.ch/search?f=author&p=Andel%2C%20B.&ln=pl">Andel, B.</a> (Comenius U.) ; <a href="https://cds.cern.ch/search?f=author&p=Algora%2C%20A.&ln=pl">Algora, A.</a> (Valencia U., IFIC ; Debrecen, Inst. Nucl. Res.) ; <a href="https://cds.cern.ch/search?f=author&p=Antalic%2C%20S.&ln=pl">Antalic, S.</a> (Comenius U.) ; <a href="https://cds.cern.ch/search?f=author&p=Benito%2C%20J.&ln=pl">Benito, J.</a> (Madrid U.) ; <a href="https://cds.cern.ch/search?f=author&p=Benzoni%2C%20G.&ln=pl">Benzoni, G.</a> (INFN, Milan) ; <a href="https://cds.cern.ch/search?f=author&p=Berry%2C%20T.&ln=pl">Berry, T.</a> (Surrey U.) ; <a href="https://cds.cern.ch/search?f=author&p=Borge%2C%20M.J.G.&ln=pl">Borge, M.J.G.</a> (CSIC, Madrid) ; <a href="https://cds.cern.ch/search?f=author&p=Costache%2C%20C.&ln=pl">Costache, C.</a> (Bucharest, IFIN-HH) ; <a href="https://cds.cern.ch/search?f=author&p=Cubiss%2C%20J.G.&ln=pl">Cubiss, J.G.</a> (York U., England) ; <a href="https://cds.cern.ch/search?f=author&p=De%20Witte%2C%20H.&ln=pl">De Witte, H.</a> (Leuven U.) ; <a href="https://cds.cern.ch/search?f=author&p=Fraile%2C%20L.M.&ln=pl">Fraile, L.M.</a> (Madrid U.) ; <a href="https://cds.cern.ch/search?f=author&p=Fynbo%2C%20H.O.U.&ln=pl">Fynbo, H.O.U.</a> (Aarhus U.) ; <a href="https://cds.cern.ch/search?f=author&p=Greenlees%2C%20P.T.&ln=pl">Greenlees, P.T.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Harkness-Brennan%2C%20L.J.&ln=pl">Harkness-Brennan, L.J.</a> (Liverpool U.) ; <a href="https://cds.cern.ch/search?f=author&p=Huyse%2C%20M.&ln=pl">Huyse, M.</a> (Leuven U.) ; <a href="https://cds.cern.ch/search?f=author&p=Illana%2C%20A.&ln=pl">Illana, A.</a> (INFN, Legnaro) ; <a href="https://cds.cern.ch/search?f=author&p=Jolie%2C%20J.&ln=pl">Jolie, J.</a> (Cologne U.) ; <a href="https://cds.cern.ch/search?f=author&p=Judson%2C%20D.S.&ln=pl">Judson, D.S.</a> (Liverpool U.) ; <a href="https://cds.cern.ch/search?f=author&p=Konki%2C%20J.&ln=pl">Konki, J.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Lazarus%2C%20I.&ln=pl">Lazarus, I.</a> (Daresbury) ; <a href="https://cds.cern.ch/search?f=author&p=Madurga%2C%20M.&ln=pl">Madurga, M.</a> (U. Tennessee, Knoxville) ; <a href="https://cds.cern.ch/search?f=author&p=Marginean%2C%20N.&ln=pl">Marginean, N.</a> (Bucharest, IFIN-HH) ; <a href="https://cds.cern.ch/search?f=author&p=Marginean%2C%20R.&ln=pl">Marginean, R.</a> ; <a href="https://cds.cern.ch/search?f=author&p=Mihai%2C%20C.&ln=pl">Mihai, C.</a> (Bucharest, IFIN-HH) ; <a href="https://cds.cern.ch/search?f=author&p=Mihai%2C%20R.E.&ln=pl">Mihai, R.E.</a> (Bucharest, IFIN-HH) ; <a href="https://cds.cern.ch/search?f=author&p=Mosat%2C%20P.&ln=pl">Mosat, P.</a> (Bucharest, IFIN-HH ; Comenius U.) ; <a href="https://cds.cern.ch/search?f=author&p=Murias%2C%20J.R.&ln=pl">Murias, J.R.</a> (Madrid U. ; Laue-Langevin Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Nacher%2C%20E.&ln=pl">Nacher, E.</a> (Valencia U., IFIC) ; <a href="https://cds.cern.ch/search?f=author&p=Negret%2C%20A.&ln=pl">Negret, A.</a> (Bucharest, IFIN-HH) ; <a href="https://cds.cern.ch/search?f=author&p=Page%2C%20R.D.&ln=pl">Page, R.D.</a> (Liverpool U.) ; <a href="https://cds.cern.ch/search?f=author&p=Perea%2C%20A.&ln=pl">Perea, A.</a> (CSIC, Madrid) ; <a href="https://cds.cern.ch/search?f=author&p=Pucknell%2C%20V.&ln=pl">Pucknell, V.</a> (Daresbury) ; <a href="https://cds.cern.ch/search?f=author&p=Rahkila%2C%20P.&ln=pl">Rahkila, P.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Rezynkina%2C%20K.&ln=pl">Rezynkina, K.</a> (Leuven U. ; Strasbourg, IPHC) ; <a href="https://cds.cern.ch/search?f=author&p=S%C3%A1nchez-Tembleque%2C%20V.&ln=pl">Sánchez-Tembleque, V.</a> (Madrid U.) ; <a href="https://cds.cern.ch/search?f=author&p=Schomacker%2C%20K.&ln=pl">Schomacker, K.</a> (Cologne U.) ; <a href="https://cds.cern.ch/search?f=author&p=Stryjczyk%2C%20M.&ln=pl">Stryjczyk, M.</a> (Leuven U. ; Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=S%C3%BCrder%2C%20C.&ln=pl">Sürder, C.</a> (Darmstadt, Tech. U.) ; <a href="https://cds.cern.ch/search?f=author&p=Tengblad%2C%20O.&ln=pl">Tengblad, O.</a> (CSIC, Madrid) ; <a href="https://cds.cern.ch/search?f=author&p=Vedia%2C%20V.&ln=pl">Vedia, V.</a> (Madrid U.) ; <a href="https://cds.cern.ch/search?f=author&p=Warr%2C%20N.&ln=pl">Warr, N.</a> (Cologne U.)</p> <span id="extension"></span> <small><i><a id="link" href="#" onclick="toggle_authors_visibility()" style="color:rgb(204,0,0);"></a></i></small><script type="text/javascript">set_up()</script></td></tr>  <script type="text/javascript"> /* * Changes the Imprint title to Date - Duration as requested by RQF0820114 * This is a hack not to touch the general imprint format element */ $(document).ready(function() { var collections = 'PREPRINT'; if (collections.indexOf('E-LEARNING') > -1) { $('.cern-imprint-label').text('Date - Duration'); } }) </script> <tr><td class="formatRecordLabel cern-imprint-label"> Imprint </td><td style="padding-left:5px;">2024-07-04</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">6</td></tr>  <tr><td class="formatRecordLabel"> Note </td><td style="padding-left:5px;">6 pages, 5 figures (main manuscript), 2 pages (supplemental material)</td></tr> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">nucl-th ; Nuclear Physics - Theory ; nucl-ex ; Nuclear Physics - Experiment</td></tr> <tr><td class="formatRecordLabel"> Accelerator/Facility, Experiment </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?p=CERN%20ISOLDE&f=693__a">CERN ISOLDE</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">Polonium isotopes having two protons above the shell closure at $Z=82$ show a wide variety of low-lying high-spin isomeric states across the whole chain. The structure of neutron-deficient isotopes up to $^{210}$Po ($N=126$) is well established as they are easily produced through various methods. However, there is not much information available for the neutron-rich counterparts for which only selective techniques can be used for their production. We report on the first fast-timing measurements of yrast states up to the 8$^+$ level in $^{214,216,218}$Po isotopes produced in the $\beta^-$ decay of $^{214,216,218}$Bi at ISOLDE, CERN. In particular, our new half-life value of 607(14) ps for the 8$_1^+$ state in $^{214}$Po is nearly 20 times shorter than the one available in literature and comparable with the newly measured half-lives of 409(16) and 628(25) ps for the corresponding 8$_1^+$ states in $^{216,218}$Po, respectively. The measured $B(E2;8_1^+ \to 6_1^+)$ transition probability values follow an increasing trend relative to isotope mass, reaching a maximum for $^{216}$Po. The increase contradicts the previous claims of isomerism for the $8^+$ yrast states in neutron-rich $^{214}$Po and beyond. Together with the other measured yrast transitions, the $B(E2)$ values provide a crucial test of the different theoretical approaches describing the underlying configurations of the yrast band. The new experimental results are compared to shell-model calculations using the KHPE and H208 effective interactions and their pairing modified versions, showing an increase in configuration mixing when moving towards the heavier isotopes.</td></tr> <tr><td class="formatRecordLabel"> Other source </td><td style="padding-left:5px;"><a href="http://inspirehep.net/record/2804775">Inspire</a></td></tr> <tr><td class="formatRecordLabel"> Copyright/License </td><td style="padding-left:5px;">preprint: (License: <a href="http://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a>)</td></tr> </table> <br /><div style="max-width:1024px;margin:auto"><div style="overflow-x:auto;display:inline;width:100%;"><a href="/record/2904769/plots#0"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2904769/files/graph_spectra.png" title=" $\beta$-gated $\gamma$-ray spectra recorded by the HPGe (black) and LaBr$_3$(Ce) (red) detectors following the $\beta^-$ decay of $^{214}$Bi (a), $^{216}$Bi (b) and $^{218}$Bi (c). The yrast transitions in $^{214,216,218}$Po are labeled. $\gamma$ rays from the $\beta$-decays of $^{84-88}$Br were also identified, originating from Ba$^{84-88}$Br$^+$ radioactive molecules produced in the target and matching mass 214, 216 or 218. The most intense contaminant visible in the region of interest is marked with the '*' symbol in panel (c) and originates from the $\beta$-decay of $^{87}$Kr." width="200px"/></a> <a href="/record/2904769/plots#1"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2904769/files/graph_halflives.png" title=" (a-c) Background-subtracted time difference distributions between $\beta$ particles recorded in the fast plastic scintillator and $\gamma$ rays directly depopulating the yrast $8^+$ states in $^{214,216,218}$Po, extracted from $\beta$-$\gamma_{La}$-$\gamma_{Ge}$ events. (d-l) Delayed (black) and anti-delayed (red) background-subtracted time distributions between $\gamma$ rays directly feeding and de-exciting the yrast 2$^+$, 4$^+$ and 6$^+$ states in $^{214,216,218}$Po, extracted from $\gamma_{La}$-$\gamma _{La}$ events. The half-lives, reported in Table\,\ref{tab:be2}, were measured using the decay slope method (a-c) and the centroid-shift method (d-l) \cite{mach2, mach1}. The longer lived component (tail) in the $^{214}$Po 6$^+$ spectrum (d) originates from the 8$^+$ half-life due to an overlap in the LaBr3(Ce) energy spectra between the feeding (240 keV) and de-exciting (245 keV) transitions. However, it was excluded when evaluating the centroid shift of the distribution." width="200px"/></a> <a href="/record/2904769/plots#2"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2904769/files/Po.png" title=" The calculated $0^+-8^+$ yrast energy levels of even-even $^{210-218}$Po isotopes using H208, H208-m, KHPE and KHPE-m interactions, compared to the available experimental data \cite{nds210,nds212,nds214,nds216,nds218,astier2011}." width="200px"/></a> <a href='/record/2904769/plots'>Show more plots</a></div></div><br /> <br/><div><div style="clear: both;"> </div></div> <script type="text/javascript"> // Initially hide: $(".longCaption").hide(); // Allow to toggle visibility: $(".toggleLongCaption").toggle(function(){ $(this).siblings(".longCaption").show('fast'); var thisElem = $(this); thisElem.text(thisElem.text() === "więcej" ? 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The structure of neutron-deficient isotopes up to $^{210}$Po ($N=126$) is well established as they are easily produced through various methods. However, there is not much information available for the neutron-rich counterparts for which only selective techniques can be used for their production. We report on the first fast-timing measurements of yrast states up to the 8$^+$ level in $^{214,216,218}$Po isotopes produced in the $\\beta^-$ decay of $^{214,216,218}$Bi at ISOLDE, CERN. In particular, our new half-life value of 607(14) ps for the 8$_1^+$ state in $^{214}$Po is nearly 20 times shorter than the one available in literature and comparable with the newly measured half-lives of 409(16) and 628(25) ps for the corresponding 8$_1^+$ states in $^{216,218}$Po, respectively. The measured $B(E2;8_1^+ \\to 6_1^+)$ transition probability values follow an increasing trend relative to isotope mass, reaching a maximum for $^{216}$Po. The increase contradicts the previous claims of isomerism for the $8^+$ yrast states in neutron-rich $^{214}$Po and beyond. Together with the other measured yrast transitions, the $B(E2)$ values provide a crucial test of the different theoretical approaches describing the underlying configurations of the yrast band. The new experimental results are compared to shell-model calculations using the KHPE and H208 effective interactions and their pairing modified versions, showing an increase in configuration mixing when moving towards the heavier isotopes." }); // ]]> </script>  </div> </div> <div style="clear:both;margin-bottom: 0;"></div> </div> <div class="bottom-left"></div><div class="bottom-right"></div> </div> </div></div> <footer id="footer" class="pagefooter clearfix">  <div class="pagefooterstripeleft"> CERN Document Server :: <a class="footer" href="https://cds.cern.ch/?ln=pl">Szukaj</a> :: <a class="footer" href="https://cds.cern.ch/submit?ln=pl">Dodaj</a> :: <a class="footer" href="https://cds.cern.ch/youraccount/display?ln=pl">Ustawienia</a> :: <a class="footer" href="https://cds.cern.ch/help/?ln=pl">Pomoc</a> :: <a class="footer" href="https://cern.service-now.com/service-portal?id=privacy_policy&se=CDS-Service" target="_blank">Privacy Notice</a> <br /> System <a class="footer" href="http://invenio-software.org/">Invenio</a> <br /> Administrator <a class="footer" href="https://cern.service-now.com/service-portal?id=service_element&name=CDS-Service">CDS Service</a> - Need help? 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