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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>Probing exotic cross-shell interactions at $N=28$ with single-neutron transfer on $^{47}$K - 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/2911564" /> <link rel="alternate" hreflang="el" href="https://cds.cern.ch/record/2911564?ln=el" /> <link rel="alternate" hreflang="fr" href="https://cds.cern.ch/record/2911564?ln=fr" /> <link rel="alternate" hreflang="bg" href="https://cds.cern.ch/record/2911564?ln=bg" /> <link rel="alternate" hreflang="zh-TW" href="https://cds.cern.ch/record/2911564?ln=zh_TW" /> <link rel="alternate" hreflang="pt" href="https://cds.cern.ch/record/2911564?ln=pt" /> <link rel="alternate" hreflang="no" href="https://cds.cern.ch/record/2911564?ln=no" /> <link rel="alternate" hreflang="hr" href="https://cds.cern.ch/record/2911564?ln=hr" /> <link rel="alternate" hreflang="ca" href="https://cds.cern.ch/record/2911564?ln=ca" /> <link rel="alternate" hreflang="de" href="https://cds.cern.ch/record/2911564?ln=de" /> <link rel="alternate" hreflang="it" href="https://cds.cern.ch/record/2911564?ln=it" /> <link rel="alternate" hreflang="zh-CN" href="https://cds.cern.ch/record/2911564?ln=zh_CN" /> <link rel="alternate" hreflang="sv" href="https://cds.cern.ch/record/2911564?ln=sv" /> <link rel="alternate" hreflang="sk" href="https://cds.cern.ch/record/2911564?ln=sk" /> <link rel="alternate" hreflang="en" href="https://cds.cern.ch/record/2911564?ln=en" /> <link rel="alternate" hreflang="pl" href="https://cds.cern.ch/record/2911564?ln=pl" /> <link rel="alternate" hreflang="ru" href="https://cds.cern.ch/record/2911564?ln=ru" /> <link rel="alternate" hreflang="ka" href="https://cds.cern.ch/record/2911564?ln=ka" /> <link rel="alternate" hreflang="ja" href="https://cds.cern.ch/record/2911564?ln=ja" /> <link rel="alternate" hreflang="es" href="https://cds.cern.ch/record/2911564?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="We present the first measurement of the $^{47}$K($d,p\gamma$)$^{48}$K transfer reaction, performed in inverse kinematics using a reaccelerated beam of $^{47}$K. The level scheme of $^{48}$K has been greatly extended with nine new bound excited states identified and spectroscopic factors deduced. Detailed comparisons with SDPF-U and SDPF-MU shell-model calculations reveal a number of discrepancies with these results, and a preference for SDPF-MU is found. Intriguingly, an apparent systematic overestimation of spectroscopic factors and a poor reproduction of the energies for 1$^-$ states suggests that the mixing between the $\pi s^{\,\,\,1}_{1/2} d^{\,\,\,4}_{3/2}$ and $\pi s^{\,\,\,2}_{1/2} d^{\,\,\,3}_{3/2}$ proton configurations in $^{48}$K is not correctly described using current interactions, challenging our descriptions of light $N=28$ nuclei. Paxman, C.J.; Matta, A.; Catford, W.N.; Lotay, G.; Assié, M.; Clément, E.; Lemasson, A.; Ramos, D.; Orr, N.A.; Galtarossa, F.; Girard-Alcindor, V.; Dudouet, J.; Achouri, N.L.; Ackermann, D.; Barrientos, D.; Beaumel, D.; Bednarczyk, P.; Benzoni, G.; Bracco, A.; Canete, L.; Cederwall, B.; Ciemala, M.; Delahaye, P.; Doherty, D.T.; Domingo-Pardo, C.; Fernández-Domínguez, B.; Fernández, D.; Flavigny, F.; Fougères, C.; de France, G.; Franchoo, S.; Gadea, A.; Gibelin, J.; González, V.; Gottardo, A.; Goyal, N.; Hammache, F.; Harkness-Brennan, L.J.; Harrouz, D.S.; Jacquot, B.; Judson, D.S.; Jungclaus, A.; Kaşkaş, A.; Korten, W.; Labiche, M.; Lalanne, L.; Lenain, C.; Leoni, S.; Ljungvall, J.; Lois-Fuentes, J.; Lokotko, T.; Lopez-Martens, A.; Maj, A.; Marqués, F.M.; Martel, I.; Menegazzo, R.; Mengoni, D.; Million, B.; Nyberg, J.; Pérez-Vidal, R.M.; Plagnol, L.; Podolyák, Zs.; Pullia, A.; Quintana, B.; Regueira-Castro, D.; Reiter, P.; Rejmund, M.; Rezynkina, K.; Sanchis, E.; Şenyiğit, M.; de Séréville, N.; Siciliano, M.; Sohler, D.; Stezowski, O.; Thomas, J.-C.; Utepov, A.; Valiente-Dobón, J.J.; Verney, D.; Zielińska, M." /> <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 : Probing exotic cross-shell interactions at $N=28$ with single-neutron transfer on $^{47}$K" name="citation_title" /> <meta content="Paxman, C.J." 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The level scheme of $^{48}$K has been greatly extended with nine new bound excited states identified and spectroscopic factors deduced. Detailed comparisons with SDPF-U and SDPF-MU shell-model calculations reveal a number of discrepancies with these results, and a preference for SDPF-MU is found. Intriguingly, an apparent systematic overestimation of spectroscopic factors and a poor reproduction of the energies for 1$^-$ states suggests that the mixing between the $\pi s^{\,\,\,1}_{1/2} d^{\,\,\,4}_{3/2}$ and $\pi s^{\,\,\,2}_{1/2} d^{\,\,\,3}_{3/2}$ proton configurations in $^{48}$K is not correctly described using current interactions, challenging our descriptions of light $N=28$ nuclei." property="og:description" /> <meta content="arXiv" 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/2911564" 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> > Probing exotic cross-shell interactions at $N=28$ with single-neutron transfer on $^{47}$K </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/2911564/?ln=en">Information </a></li><li class=""><a href="/record/2911564/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">  <abbr class="unapi-id" title="2911564"></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:2409.12594">arXiv:2409.12594</a></td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>Probing exotic cross-shell interactions at $N=28$ with single-neutron transfer on $^{47}$K</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 = "Hide" } else { more.style.display = 'none'; extension.style.display = ''; link.innerHTML = "Show all 79 authors" } link.style.color = "rgb(204,0,0);" } function set_up(){ var extension = document.getElementById('extension'); extension.innerHTML = ""; toggle_authors_visibility(); } </script> <a name="show_hide" /><a href="https://cds.cern.ch/search?f=author&p=Paxman%2C%20C.J.&ln=en">Paxman, C.J.</a> (Surrey U.) ; <a href="https://cds.cern.ch/search?f=author&p=Matta%2C%20A.&ln=en">Matta, A.</a> (LPC, Caen) ; <a href="https://cds.cern.ch/search?f=author&p=Catford%2C%20W.N.&ln=en">Catford, W.N.</a> (Surrey U.) ; <a href="https://cds.cern.ch/search?f=author&p=Lotay%2C%20G.&ln=en">Lotay, G.</a> (Surrey U.) ; <a href="https://cds.cern.ch/search?f=author&p=Assi%C3%A9%2C%20M.&ln=en">Assié, M.</a> (IJCLab, Orsay) ; <a href="https://cds.cern.ch/search?f=author&p=Cl%C3%A9ment%2C%20E.&ln=en">Clément, E.</a> (GANIL) ; <a href="https://cds.cern.ch/search?f=author&p=Lemasson%2C%20A.&ln=en">Lemasson, A.</a> (GANIL) ; <a href="https://cds.cern.ch/search?f=author&p=Ramos%2C%20D.&ln=en">Ramos, D.</a> (GANIL) ; <a href="https://cds.cern.ch/search?f=author&p=Orr%2C%20N.A.&ln=en">Orr, N.A.</a> (LPC, Caen) ; <a href="https://cds.cern.ch/search?f=author&p=Galtarossa%2C%20F.&ln=en">Galtarossa, F.</a> (IJCLab, Orsay)<span id="more" style=""> ; <a href="https://cds.cern.ch/search?f=author&p=Girard-Alcindor%2C%20V.&ln=en">Girard-Alcindor, V.</a> (GANIL) ; <a href="https://cds.cern.ch/search?f=author&p=Dudouet%2C%20J.&ln=en">Dudouet, J.</a> (IP2I, Lyon) ; <a href="https://cds.cern.ch/search?f=author&p=Achouri%2C%20N.L.&ln=en">Achouri, N.L.</a> (LPC, Caen) ; <a href="https://cds.cern.ch/search?f=author&p=Ackermann%2C%20D.&ln=en">Ackermann, D.</a> (GANIL) ; <a href="https://cds.cern.ch/search?f=author&p=Barrientos%2C%20D.&ln=en">Barrientos, D.</a> (CERN) ; 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Res.) ; <a href="https://cds.cern.ch/search?f=author&p=Stezowski%2C%20O.&ln=en">Stezowski, O.</a> (IP2I, Lyon) ; <a href="https://cds.cern.ch/search?f=author&p=Thomas%2C%20J.-C.&ln=en">Thomas, J.-C.</a> (GANIL) ; <a href="https://cds.cern.ch/search?f=author&p=Utepov%2C%20A.&ln=en">Utepov, A.</a> (GANIL) ; <a href="https://cds.cern.ch/search?f=author&p=Valiente-Dob%C3%B3n%2C%20J.J.&ln=en">Valiente-Dobón, J.J.</a> (INFN, Legnaro) ; <a href="https://cds.cern.ch/search?f=author&p=Verney%2C%20D.&ln=en">Verney, D.</a> (IJCLab, Orsay) ; <a href="https://cds.cern.ch/search?f=author&p=Zieli%C5%84ska%2C%20M.&ln=en">Zielińska, M.</a> (IRFU, Saclay)</span> <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;">2024-09-19</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">7</td></tr>  <tr><td class="formatRecordLabel"> Note </td><td style="padding-left:5px;">7 pages, 3 figures, 1 table</td></tr> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">nucl-ex ; Nuclear Physics - Experiment</td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">We present the first measurement of the $^{47}$K($d,p\gamma$)$^{48}$K transfer reaction, performed in inverse kinematics using a reaccelerated beam of $^{47}$K. The level scheme of $^{48}$K has been greatly extended with nine new bound excited states identified and spectroscopic factors deduced. Detailed comparisons with SDPF-U and SDPF-MU shell-model calculations reveal a number of discrepancies with these results, and a preference for SDPF-MU is found. Intriguingly, an apparent systematic overestimation of spectroscopic factors and a poor reproduction of the energies for 1$^-$ states suggests that the mixing between the $\pi s^{\,\,\,1}_{1/2} d^{\,\,\,4}_{3/2}$ and $\pi s^{\,\,\,2}_{1/2} d^{\,\,\,3}_{3/2}$ proton configurations in $^{48}$K is not correctly described using current interactions, challenging our descriptions of light $N=28$ nuclei.</td></tr> <tr><td class="formatRecordLabel"> Other source </td><td style="padding-left:5px;"><a href="http://inspirehep.net/record/2830392">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/2911564/plots#0"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2911564/files/Figure1.png" title=" (Color online) (a) Full reconstructed excitation energy spectrum of $^{48}$K in black, with the neutron separation energy, $S_n = 4.644$~MeV, indicated. Peaks are labeled with their energies as determined by $\gamma$-ray spectroscopy. Three excitation energy spectra in coincidence with three observed $\gamma$-rays (scaled by branching ratio and efficiency) are shown in colour, showcasing how otherwise-unresolved peaks can be resolved. The peak marked with an asterisk represents an unresolved multiplet -- see text. (b) Gamma-decays observed with AGATA over the energy range 0.0$-$0.6 MeV (cf.~Table~\ref{tableOfStates}). The small peak at 0.357(1)~MeV corresponds to the decay of the first excited state in $^{47}$K (slightly shifted due to its 1~ns lifetime~\cite{Burrows2007_NDS_47K}) which is populated here by the decay of neutron-unbound states in $^{48}$K. (c) Gamma-decays observed with AGATA over the energy range 2.3$-$3.7 MeV. Symbols indicate the $\gamma$-rays (2.407, 2.872 and 3.516~MeV) used to construct the coloured excitation spectra." width="200px"/></a> <a href="/record/2911564/plots#1"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2911564/files/Figure2.png" title=" Experimental differential cross sections for states observed in this work, with the scaled theoretical differential cross sections for $\ell_p$=1 ($\ell_p$=3) transfer in solid red (dashed blue) lines: (a)~Ground state, (b)~0.143~MeV, (c)~0.967~MeV, (d)~1.409~MeV, (e)~1.978~MeV, (f)~2.407~MeV, (g)~2.908~MeV, (h)~3.601~MeV, (i)~3.792 \& 3.868~MeV, (j)~High energy multiplet. Only in the case of (g) was both $\ell$=1 and $\ell$=3 clearly required, with the best-fit shown in dot-dash green." width="200px"/></a> <a href="/record/2911564/plots#2"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2911564/files/Figure3.png" title=" Partial level schemes of states directly populated by $^{47}$K($d,p$) as observed experimentally, and as predicted by shell model calculations using SDPF-MU~\cite{Otsuka2010_SDPF-MU_Vmu,Utsuno2012_SDPF-MU} and SDPF-U~\cite{Nowacki2009_SDPF-U}. For each state, the filled length of the line represents the spectroscopic factor, $S$. All shell model states with $S$~$\geq$~0.1 are shown -- as such, 2$^-_2$ and 3$^-_1$ are excluded. The $p$-wave ($f$-wave) states are shown in red (blue) and fill from the left (right). The mixed state (green) fills from both sides." width="200px"/></a> <a href='/record/2911564/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() === "more" ? "less" : "more"); },function(){ $(this).siblings(".longCaption").hide('fast'); var thisElem = $(this); thisElem.text(thisElem.text() === "more" ? 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The level scheme of $^{48}$K has been greatly extended with nine new bound excited states identified and spectroscopic factors deduced. Detailed comparisons with SDPF-U and SDPF-MU shell-model calculations reveal a number of discrepancies with these results, and a preference for SDPF-MU is found. Intriguingly, an apparent systematic overestimation of spectroscopic factors and a poor reproduction of the energies for 1$^-$ states suggests that the mixing between the $\\pi s^{\\,\\,\\,1}_{1/2} d^{\\,\\,\\,4}_{3/2}$ and $\\pi s^{\\,\\,\\,2}_{1/2} d^{\\,\\,\\,3}_{3/2}$ proton configurations in $^{48}$K is not correctly described using current interactions, challenging our descriptions of light $N=28$ nuclei." }); // ]]> </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=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> :: <a class="footer" href="https://repository.cern/content-policy" target="_blank">Content Policy</a> :: <a class="footer" href="https://repository.cern/terms" target="_blank">Terms and Conditions</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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