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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">     <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en" xmlns:og="http://ogp.me/ns#" xmlns:fb="http://ogp.me/ns/fb#"> <head> <title>On the nature of yrast states in neutron-rich polonium isotopes - CERN Document Server</title> <link href='https://framework.web.cern.ch/framework/2.0/fonts/PTSansWeb/PTSansWeb.css' rel='stylesheet' type='text/css' /> <link rel="stylesheet" href="https://cds.cern.ch/img/invenio.css?v=20141127" type="text/css" /> <link rel="stylesheet" href="https://cds.cern.ch/img/cern_theme/css/cern_theme.css?v=20141127" type="text/css" /> <link rel="stylesheet"href="/css/font-awesome.min.css"> <meta http-equiv="X-UA-Compatible" content="IE=Edge"/> <link rel="stylesheet" href="https://cds.cern.ch/img/cern_toolbar/css/toolbar.css" type="text/css" />    <link rel="canonical" href="https://cds.cern.ch/record/2904769/plots" /> <link rel="alternate" hreflang="el" href="https://cds.cern.ch/record/2904769/plots?ln=el" /> <link rel="alternate" hreflang="fr" href="https://cds.cern.ch/record/2904769/plots?ln=fr" /> <link rel="alternate" hreflang="bg" href="https://cds.cern.ch/record/2904769/plots?ln=bg" /> <link rel="alternate" hreflang="zh-TW" href="https://cds.cern.ch/record/2904769/plots?ln=zh_TW" /> <link rel="alternate" hreflang="pt" href="https://cds.cern.ch/record/2904769/plots?ln=pt" /> <link rel="alternate" hreflang="no" href="https://cds.cern.ch/record/2904769/plots?ln=no" /> <link rel="alternate" hreflang="hr" href="https://cds.cern.ch/record/2904769/plots?ln=hr" /> <link rel="alternate" hreflang="ca" href="https://cds.cern.ch/record/2904769/plots?ln=ca" /> <link rel="alternate" hreflang="de" href="https://cds.cern.ch/record/2904769/plots?ln=de" /> <link rel="alternate" hreflang="it" href="https://cds.cern.ch/record/2904769/plots?ln=it" /> <link rel="alternate" hreflang="zh-CN" href="https://cds.cern.ch/record/2904769/plots?ln=zh_CN" /> <link rel="alternate" hreflang="sv" href="https://cds.cern.ch/record/2904769/plots?ln=sv" /> <link rel="alternate" hreflang="sk" href="https://cds.cern.ch/record/2904769/plots?ln=sk" /> <link rel="alternate" hreflang="en" href="https://cds.cern.ch/record/2904769/plots?ln=en" /> <link rel="alternate" hreflang="pl" href="https://cds.cern.ch/record/2904769/plots?ln=pl" /> <link rel="alternate" hreflang="ru" href="https://cds.cern.ch/record/2904769/plots?ln=ru" /> <link rel="alternate" hreflang="ka" href="https://cds.cern.ch/record/2904769/plots?ln=ka" /> <link rel="alternate" hreflang="ja" href="https://cds.cern.ch/record/2904769/plots?ln=ja" /> <link rel="alternate" hreflang="es" href="https://cds.cern.ch/record/2904769/plots?ln=es" /> <link rel="alternate" type="application/rss+xml" title="CERN Document Server RSS" href="/rss?ln=en" /> <link rel="search" type="application/opensearchdescription+xml" href="https://cds.cern.ch/opensearchdescription" title="CERN Document Server" /> <link rel="unapi-server" type="application/xml" title="unAPI" href="https://cds.cern.ch/unapi" /> <link rel="apple-touch-icon" href="/apple-touch-icon.png"/> <link rel="apple-touch-icon-precomposed" href="/apple-touch-icon-precomposed.png"/> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Language" content="en" /> <meta name="description" 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. 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" }); 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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." property="og:description" />  <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="CERN32Document32Server search" lang="en">  <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=en&referer=https%3A//cds.cern.ch/record/2904769/plots" 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=en">Search</a></li> <li class="menu-444 "><a class="" title="" href="https://cds.cern.ch/submit?ln=en">Submit</a></li> <li class="menu-426 "><a class="" href="https://cds.cern.ch/help/?ln=en">Help</a></li> <li class="leaf hassubcdsmenu"> <a hreflang="en" class="header" href="https://cds.cern.ch/youraccount/display?ln=en">Personalize</a> <ul class="subsubcdsmenu"><li><a href="https://cds.cern.ch/youralerts/list?ln=en">Your alerts</a></li><li><a href="https://cds.cern.ch/yourbaskets/display?ln=en">Your baskets</a></li><li><a href="https://cds.cern.ch/yourcomments?ln=en">Your comments</a></li><li><a href="https://cds.cern.ch/youralerts/display?ln=en">Your searches</a></li></ul></li> </ul> </div> </div> </div>  <table class="navtrailbox"> <tr> <td class="navtrailboxbody"> <a href="/?ln=en" class="navtrail">Home</a> > <a class="navtrail" href="/record/2904769">On the nature of yrast states in neutron-rich polonium isotopes</a> > Plots </td> </tr> </table> </div> <div class="pagebody"><div class="pagebodystripemiddle"> <div class="detailedrecordbox"> <div class="detailedrecordtabs"> <div> <ul class="detailedrecordtabs"><li class="first"><a href="/record/2904769/?ln=en">Information </a></li><li class=""><a href="/record/2904769/files?ln=en">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">  <div id="detailedrecordshortreminder"> <div id="clip"> </div> <div id="HB"> <strong><a href="/record/2904769?ln=en">On the nature of yrast states in neutron-rich polonium isotopes</a></strong> - <a href="/search?f=author&p=Lic%C4%83%2C%20R.&ln=en">Lică, R.</a> <em>et al</em> - arXiv:2407.03839 </div> </div> <div style="clear:both;height:1px"> </div> <table width="95%" style="display: inline;"><tr><td width="66%"><a name="0" href="https://cds.cern.ch/record/2904769/files/graph_spectra.png"><img src="https://cds.cern.ch/record/2904769/files/graph_spectra.png" width="95%"/></a></td><td width="33%"> $\beta$-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.</td></tr></table><table width="95%" style="display: inline;"><tr><td width="66%"><a name="1" href="https://cds.cern.ch/record/2904769/files/graph_halflives.png"><img src="https://cds.cern.ch/record/2904769/files/graph_halflives.png" width="95%"/></a></td><td width="33%"> (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.</td></tr></table><table width="95%" style="display: inline;"><tr><td width="66%"><a name="2" href="https://cds.cern.ch/record/2904769/files/Po.png"><img src="https://cds.cern.ch/record/2904769/files/Po.png" width="95%"/></a></td><td width="33%"> 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}.</td></tr></table><table width="95%" style="display: inline;"><tr><td width="66%"><a name="3" href="https://cds.cern.ch/record/2904769/files/fig_ids_theory_210-218.png"><img src="https://cds.cern.ch/record/2904769/files/fig_ids_theory_210-218.png" width="95%"/></a></td><td width="33%"> $B(E2; J^\pi \rightarrow (J-2)^\pi)$ values for transitions between $^{214,216,218}$Po yrast states measured in the present work (full circles with uncertainties) and from adopted experimental values \cite{nds210,nds212} or the most recent experimental results \cite{astier2011,kocheva2017,Tre21}. The comparison with shell-model calculations using the H208 interaction initial and pairing-modified versions (colored lines) is presented. Lower limits for the experimental $B(E2)$ values are indicated with an arrow pointing up. All the values are reported in Table\,\ref{tab:be2}.</td></tr></table><table width="95%" style="display: inline;"><tr><td width="66%"><a name="4" href="https://cds.cern.ch/record/2904769/files/wf.png"><img src="https://cds.cern.ch/record/2904769/files/wf.png" width="95%"/></a></td><td width="33%"> The wave-function components of $^{214}$Po states calculated in seniority scheme where $T(x,y)$ represents the number of neutron ($x$) or proton ($y$) pairs being broken. The initial and pairing-modified versions of the H208 effective interaction are employed within the \textsc{Nathan} code.</td></tr></table><br /><br /> <div class="bottom-left-folded"></div> <div class="bottom-right-folded" style="text-align:right;padding-bottom:2px;"> <span class="moreinfo" style="margin-right:10px;"><a href="/search?ln=en&p=recid%3A2904769&rm=wrd" class="moreinfo">Similar records</a></span></div> </div> </div> </div> <br/> </div></div> <footer id="footer" class="pagefooter clearfix">  <div class="pagefooterstripeleft"> CERN Document Server :: <a class="footer" href="https://cds.cern.ch/?ln=en">Search</a> :: <a class="footer" href="https://cds.cern.ch/submit?ln=en">Submit</a> :: <a class="footer" href="https://cds.cern.ch/youraccount/display?ln=en">Personalize</a> :: <a class="footer" href="https://cds.cern.ch/help/?ln=en">Help</a> :: <a class="footer" href="https://cern.service-now.com/service-portal?id=privacy_policy&se=CDS-Service" target="_blank">Privacy Notice</a> <br /> Powered by <a class="footer" href="http://invenio-software.org/">Invenio</a> <br /> Maintained by <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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