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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="hr" xml:lang="hr" xmlns:og="http://ogp.me/ns#" xmlns:fb="http://ogp.me/ns/fb#"> <head> <title>Radiative neutron capture cross section of $^{242}$Pu measured at n_TOF-EAR1 in the unresolved resonance region up to 600 keV - 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/2918776" /> <link rel="alternate" hreflang="el" href="https://cds.cern.ch/record/2918776?ln=el" /> <link rel="alternate" hreflang="fr" href="https://cds.cern.ch/record/2918776?ln=fr" /> <link rel="alternate" hreflang="bg" href="https://cds.cern.ch/record/2918776?ln=bg" /> <link rel="alternate" hreflang="zh-TW" href="https://cds.cern.ch/record/2918776?ln=zh_TW" /> <link rel="alternate" hreflang="pt" href="https://cds.cern.ch/record/2918776?ln=pt" /> <link rel="alternate" hreflang="no" href="https://cds.cern.ch/record/2918776?ln=no" /> <link rel="alternate" hreflang="hr" href="https://cds.cern.ch/record/2918776?ln=hr" /> <link rel="alternate" hreflang="ca" href="https://cds.cern.ch/record/2918776?ln=ca" /> <link rel="alternate" hreflang="de" href="https://cds.cern.ch/record/2918776?ln=de" /> <link rel="alternate" hreflang="it" href="https://cds.cern.ch/record/2918776?ln=it" /> <link rel="alternate" hreflang="zh-CN" href="https://cds.cern.ch/record/2918776?ln=zh_CN" /> <link rel="alternate" hreflang="sv" href="https://cds.cern.ch/record/2918776?ln=sv" /> <link rel="alternate" hreflang="sk" href="https://cds.cern.ch/record/2918776?ln=sk" /> <link rel="alternate" hreflang="en" href="https://cds.cern.ch/record/2918776?ln=en" /> <link rel="alternate" hreflang="pl" href="https://cds.cern.ch/record/2918776?ln=pl" /> <link rel="alternate" hreflang="ru" href="https://cds.cern.ch/record/2918776?ln=ru" /> <link rel="alternate" hreflang="ka" href="https://cds.cern.ch/record/2918776?ln=ka" /> <link rel="alternate" hreflang="ja" href="https://cds.cern.ch/record/2918776?ln=ja" /> <link rel="alternate" hreflang="es" href="https://cds.cern.ch/record/2918776?ln=es" /> <link rel="alternate" type="application/rss+xml" title="CERN Document Server RSS" href="/rss?ln=hr" /> <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="hr" /> <meta name="description" content="The design of fast reactors burning MOX fuels requires accurate capture and fission cross sections. For the particular case of neutron capture on 242Pu, the NEA recommends that an accuracy of 8-12% should be achieved in the fast energy region (2 keV-500 keV) compared to their estimation of 35% for the current uncertainty. Integral irradiation experiments suggest that the evaluated cross section of the JEFF-3.1 library overestimates the 242Pu(n,{\gamma}) cross section by 14% in the range between 1 keV and 1 MeV. In addition, the last measurement at LANSCE reported a systematic reduction of 20-30% in the 1-40 keV range relative to the evaluated libraries and previous data sets. In the present work this cross section has been determined up to 600 keV in order to solve the mentioned discrepancies. A 242Pu target of 95(4) mg enriched to 99.959% was irradiated at the n TOF-EAR1 facility at CERN. The capture cross section of 242Pu has been obtained between 1 and 600 keV with a systematic uncertainty (dominated by background subtraction) between 8 and 12%, reducing the current uncertainties of 35% and achieving the accuracy requested by the NEA in a large energy range. The shape of the cross section has been analyzed in terms of average resonance parameters using the FITACS code as implemented in SAMMY, yielding results compatible with our recent analysis of the resolved resonance region.The results are in good agreement with the data of Wisshak and K\"appeler and on average 10-14% below JEFF-3.2 from 1 to 250 keV, which helps to achieve consistency between integral experiments and cross section data. At higher energies our results show a reasonable agreement within uncertainties with both ENDF/B-VII.1 and JEFF-3.2. Our results indicate that the last experiment from DANCE underestimates the capture cross section of 242Pu by as much as 40% above a few keV. Lerendegui-Marco, J.; Guerrero, C.; Mendoza, E.; Quesada, J.M.; Eberhardt, K.; Junghans, A.R.; Alcayne, V.; Babiano, V.; Aberle, O.; Andrzejewski, J.; Audouin, L.; Bécares, V.; Bacak, M.; Balibrea-Correa, J.; Barbagallo, M.; Barros, S.; Bečvár, F.; Beinrucker, C.; Berthoumieux, E.; Billowes, J.; Bosnar, D.; Brugger, M.; Caamaño, M.; Calviño, F.; Calviani, M.; Cano-Ott, D.; Cardella, R.; Casanovas, A.; Castelluccio, D.M.; Cerutti, F.; Chen, Y.H.; Chiaveri, E.; Colonna, N.; Cortés, G.; Cortés-Giraldo, M.A.; Cosentino, L.; Damone, L.A.; Diakaki, M.; Dietz, M.; Domingo-Pardo, C.; Dressler, R.; Dupont, E.; Durán, I.; Fernández-Domínguez, B.; Ferrari, A.; Ferreira, P.; Finocchiaro, P.; Furman, V.; Göbel, K.; García, A.R.; Gawlik, A.; Glodariu, T.; Gonçalves, I.F.; González-Romero, E.; Goverdovski, A.; Griesmayer, E.; Gunsing, F.; Harada, H.; Heftrich, T.; Heinitz, S.; Heyse, J.; Jenkins, D.G.; Jericha, E.; Käppeler, F.; Kadi, Y.; Katabuchi, T.; Kavrigin, P.; Ketlerov, V.; Khryachkov, V.; Kimura, A.; Kivel, N.; Kokkoris, M.; Krtička, M.; Leal-Cidoncha, E.; Lederer-Woods, C.; Leeb, H.; Meo, S. Lo; Lonsdale, S.J.; Losito, R.; Macina, D.; Marganiec, J.; Martínez, T.; Massimi, C.; Mastinu, P.; Mastromarco, M.; Matteucci, F.; Maugeri, E.A.; Mengoni, A.; Milazzo, P.M.; Mingrone, F.; Mirea, M.; Montesano, S.; Musumarra, A.; Nolte, R.; Oprea, A.; Patronis, N.; Pavlik, A.; Perkowski, J.; Porras, J.I.; Praena, J.; Rajeev, K.; Rauscher, T.; Reifarth, R.; Riego-Perez, A.; Rout, P.C.; Rubbia, C.; Ryan, J.A.; Sabaté-Gilarte, M.; Saxena, A.; Schillebeeckx, P.; Schmidt, S.; Schumann, D.; Sedyshev, P.; Smith, A.G.; Stamatopoulos, A.; Tagliente, G.; Tain, J.L.; Tarifeño-Saldivia, A.; Tassan-Got, L.; Tsinganis, A.; Valenta, S.; Vannini, G.; Variale, V.; Vaz, P.; Ventura, A.; Vlachoudis, V.; Vlastou, R.; Wallner, A.; Warren, S.; Weigand, M.; Weiss, C.; Wolf, C.; Woods, P.J.; Wright, T.; Zugec, P." /> <meta name="keywords" content="CERN Document Server, WebSearch, n_TOF INTC Public Documents" /> <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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content="https://cds.cern.ch/record/2918776/files/Fig6A_Counting_Rate_URR_Unweighted_diff_thresholds_ScalingGammasx0_2_UpTo500keV_FinalYAxis_svg-tex.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2918776/files/Fig6A_Counting_Rate_URR_Unweighted_diff_thresholds_ScalingGammasx0_2_UpTo500keV_FinalYAxis_svg-tex.png" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="arXiv" property="og:description" /> <meta content="The design of fast reactors burning MOX fuels requires accurate capture and fission cross sections. For the particular case of neutron capture on 242Pu, the NEA recommends that an accuracy of 8-12% should be achieved in the fast energy region (2 keV-500 keV) compared to their estimation of 35% for the current uncertainty. Integral irradiation experiments suggest that the evaluated cross section of the JEFF-3.1 library overestimates the 242Pu(n,{\gamma}) cross section by 14% in the range between 1 keV and 1 MeV. In addition, the last measurement at LANSCE reported a systematic reduction of 20-30% in the 1-40 keV range relative to the evaluated libraries and previous data sets. In the present work this cross section has been determined up to 600 keV in order to solve the mentioned discrepancies. A 242Pu target of 95(4) mg enriched to 99.959% was irradiated at the n TOF-EAR1 facility at CERN. The capture cross section of 242Pu has been obtained between 1 and 600 keV with a systematic uncertainty (dominated by background subtraction) between 8 and 12%, reducing the current uncertainties of 35% and achieving the accuracy requested by the NEA in a large energy range. The shape of the cross section has been analyzed in terms of average resonance parameters using the FITACS code as implemented in SAMMY, yielding results compatible with our recent analysis of the resolved resonance region.The results are in good agreement with the data of Wisshak and K\&quot;appeler and on average 10-14% below JEFF-3.2 from 1 to 250 keV, which helps to achieve consistency between integral experiments and cross section data. At higher energies our results show a reasonable agreement within uncertainties with both ENDF/B-VII.1 and JEFF-3.2. Our results indicate that the last experiment from DANCE underestimates the capture cross section of 242Pu by as much as 40% above a few keV." property="og:description" />  <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="n_TOF32INTC32Public32Documents search" lang="hr">  <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=hr&referer=https%3A//cds.cern.ch/record/2918776%3Fln%3Dhr" 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=hr">Pretraži</a></li> <li class="menu-444 "><a class="" title="" href="https://cds.cern.ch/submit?ln=hr">Prihvati</a></li> <li class="menu-426 "><a class="" href="https://cds.cern.ch/help/?ln=hr">Pomoć</a></li> <li class="leaf hassubcdsmenu"> <a hreflang="en" class="header" href="https://cds.cern.ch/youraccount/display?ln=hr">Personaliziraj</a> <ul class="subsubcdsmenu"><li><a href="https://cds.cern.ch/youralerts/list?ln=hr">Your alerts</a></li><li><a href="https://cds.cern.ch/yourbaskets/display?ln=hr">Your baskets</a></li><li><a href="https://cds.cern.ch/yourcomments?ln=hr">Your comments</a></li><li><a href="https://cds.cern.ch/youralerts/display?ln=hr">Your searches</a></li></ul></li> </ul> </div> </div> </div>  <table class="navtrailbox"> <tr> <td class="navtrailboxbody"> <a href="/?ln=hr" class="navtrail">Početna stranica</a> > <a href="/collection/CERN%20Experiments?ln=hr" class="navtrail">CERN Experiments</a> > <a href="/collection/PS%20Experiments?ln=hr" class="navtrail">PS Experiments</a> > <a href="/collection/n_TOF?ln=hr" class="navtrail">n_TOF</a> > <a href="/collection/n_TOF%20INTC%20Public%20Documents?ln=hr" class="navtrail">n_TOF INTC Public Documents</a> > Radiative neutron capture cross section of $^{242}$Pu measured at n_TOF-EAR1 in the unresolved resonance region up to 600 keV </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/2918776/?ln=hr">Information </a></li><li class=""><a href="/record/2918776/comments?ln=hr">Discussion (0) </a></li><li class=""><a href="/record/2918776/files?ln=hr">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="2918776"></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:2412.01332">arXiv:2412.01332</a></td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>Radiative neutron capture cross section of $^{242}$Pu measured at n_TOF-EAR1 in the unresolved resonance region up to 600 keV</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 = "Sakrij" } else { more.style.display = 'none'; extension.style.display = ''; link.innerHTML = "Prikaži svih 135 autora" } link.style.color = "rgb(204,0,0);" } function set_up(){ var extension = document.getElementById('extension'); extension.innerHTML = "n_TOF Collaboration "; toggle_authors_visibility(); } </script> <a name="show_hide" /><p id="more" style=""><a href="https://cds.cern.ch/search?f=author&p=Lerendegui-Marco%2C%20J.&ln=hr">Lerendegui-Marco, J.</a> (Seville U. ; Valencia U., IFIC) ; <a href="https://cds.cern.ch/search?f=author&p=Guerrero%2C%20C.&ln=hr">Guerrero, C.</a> (Seville U. ; CNA, Seville) ; <a href="https://cds.cern.ch/search?f=author&p=Mendoza%2C%20E.&ln=hr">Mendoza, E.</a> (Madrid, CIEMAT) ; <a href="https://cds.cern.ch/search?f=author&p=Quesada%2C%20J.M.&ln=hr">Quesada, J.M.</a> (Seville U.) ; <a href="https://cds.cern.ch/search?f=author&p=Eberhardt%2C%20K.&ln=hr">Eberhardt, K.</a> (Mainz U.) ; <a href="https://cds.cern.ch/search?f=author&p=Junghans%2C%20A.R.&ln=hr">Junghans, A.R.</a> (HZDR, Dresden) ; <a href="https://cds.cern.ch/search?f=author&p=Alcayne%2C%20V.&ln=hr">Alcayne, V.</a> (Madrid, CIEMAT) ; <a href="https://cds.cern.ch/search?f=author&p=Babiano%2C%20V.&ln=hr">Babiano, V.</a> (Valencia U., IFIC) ; <a href="https://cds.cern.ch/search?f=author&p=Aberle%2C%20O.&ln=hr">Aberle, O.</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Andrzejewski%2C%20J.&ln=hr">Andrzejewski, J.</a> (Lodz U.) ; <a href="https://cds.cern.ch/search?f=author&p=Audouin%2C%20L.&ln=hr">Audouin, L.</a> (Orsay, IPN) ; <a href="https://cds.cern.ch/search?f=author&p=B%C3%A9cares%2C%20V.&ln=hr">Bécares, V.</a> (Madrid, CIEMAT) ; <a href="https://cds.cern.ch/search?f=author&p=Bacak%2C%20M.&ln=hr">Bacak, M.</a> (TU Vienna) ; <a href="https://cds.cern.ch/search?f=author&p=Balibrea-Correa%2C%20J.&ln=hr">Balibrea-Correa, J.</a> (Madrid, CIEMAT) ; <a href="https://cds.cern.ch/search?f=author&p=Barbagallo%2C%20M.&ln=hr">Barbagallo, M.</a> (INFN, Bari) ; <a href="https://cds.cern.ch/search?f=author&p=Barros%2C%20S.&ln=hr">Barros, S.</a> (Lisbon, IST) ; <a href="https://cds.cern.ch/search?f=author&p=Be%C4%8Dv%C3%A1r%2C%20F.&ln=hr">Bečvár, F.</a> (Charles U.) ; <a href="https://cds.cern.ch/search?f=author&p=Beinrucker%2C%20C.&ln=hr">Beinrucker, C.</a> (Frankfurt U.) ; <a href="https://cds.cern.ch/search?f=author&p=Berthoumieux%2C%20E.&ln=hr">Berthoumieux, E.</a> (IRFU, Saclay) ; <a href="https://cds.cern.ch/search?f=author&p=Billowes%2C%20J.&ln=hr">Billowes, J.</a> (Manchester U.) ; <a href="https://cds.cern.ch/search?f=author&p=Bosnar%2C%20D.&ln=hr">Bosnar, D.</a> (Zagreb U., Phys. Dept.) ; <a href="https://cds.cern.ch/search?f=author&p=Brugger%2C%20M.&ln=hr">Brugger, M.</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Caama%C3%B1o%2C%20M.&ln=hr">Caamaño, M.</a> (Santiago de Compostela U.) ; <a href="https://cds.cern.ch/search?f=author&p=Calvi%C3%B1o%2C%20F.&ln=hr">Calviño, F.</a> (Barcelona, Polytechnic U.) ; <a href="https://cds.cern.ch/search?f=author&p=Calviani%2C%20M.&ln=hr">Calviani, M.</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Cano-Ott%2C%20D.&ln=hr">Cano-Ott, D.</a> (Madrid, CIEMAT) ; <a href="https://cds.cern.ch/search?f=author&p=Cardella%2C%20R.&ln=hr">Cardella, R.</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Casanovas%2C%20A.&ln=hr">Casanovas, A.</a> (Barcelona, Polytechnic U.) ; <a href="https://cds.cern.ch/search?f=author&p=Castelluccio%2C%20D.M.&ln=hr">Castelluccio, D.M.</a> (ENEA, Casaccia ; INFN, Bologna) ; <a href="https://cds.cern.ch/search?f=author&p=Cerutti%2C%20F.&ln=hr">Cerutti, F.</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Chen%2C%20Y.H.&ln=hr">Chen, Y.H.</a> (Orsay, IPN) ; <a href="https://cds.cern.ch/search?f=author&p=Chiaveri%2C%20E.&ln=hr">Chiaveri, E.</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Colonna%2C%20N.&ln=hr">Colonna, N.</a> (INFN, Bari) ; <a href="https://cds.cern.ch/search?f=author&p=Cort%C3%A9s%2C%20G.&ln=hr">Cortés, G.</a> (Barcelona, Polytechnic U.) ; <a href="https://cds.cern.ch/search?f=author&p=Cort%C3%A9s-Giraldo%2C%20M.A.&ln=hr">Cortés-Giraldo, M.A.</a> (Seville U.) ; <a href="https://cds.cern.ch/search?f=author&p=Cosentino%2C%20L.&ln=hr">Cosentino, L.</a> (INFN, Catania) ; <a href="https://cds.cern.ch/search?f=author&p=Damone%2C%20L.A.&ln=hr">Damone, L.A.</a> (INFN, Bari ; Bari U.) ; <a href="https://cds.cern.ch/search?f=author&p=Diakaki%2C%20M.&ln=hr">Diakaki, M.</a> (IRFU, Saclay) ; <a href="https://cds.cern.ch/search?f=author&p=Dietz%2C%20M.&ln=hr">Dietz, M.</a> (Edinburgh U.) ; <a href="https://cds.cern.ch/search?f=author&p=Domingo-Pardo%2C%20C.&ln=hr">Domingo-Pardo, C.</a> (Valencia U., IFIC) ; <a href="https://cds.cern.ch/search?f=author&p=Dressler%2C%20R.&ln=hr">Dressler, R.</a> (PSI, Villigen) ; <a href="https://cds.cern.ch/search?f=author&p=Dupont%2C%20E.&ln=hr">Dupont, E.</a> (IRFU, Saclay) ; <a href="https://cds.cern.ch/search?f=author&p=Dur%C3%A1n%2C%20I.&ln=hr">Durán, I.</a> (Santiago de Compostela U.) ; <a href="https://cds.cern.ch/search?f=author&p=Fern%C3%A1ndez-Dom%C3%ADnguez%2C%20B.&ln=hr">Fernández-Domínguez, B.</a> (Santiago de Compostela U.) ; <a href="https://cds.cern.ch/search?f=author&p=Ferrari%2C%20A.&ln=hr">Ferrari, A.</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Ferreira%2C%20P.&ln=hr">Ferreira, P.</a> (Lisbon, IST) ; <a href="https://cds.cern.ch/search?f=author&p=Finocchiaro%2C%20P.&ln=hr">Finocchiaro, P.</a> (INFN, Catania) ; <a href="https://cds.cern.ch/search?f=author&p=Furman%2C%20V.&ln=hr">Furman, V.</a> (Dubna, JINR) ; <a href="https://cds.cern.ch/search?f=author&p=G%C3%B6bel%2C%20K.&ln=hr">Göbel, K.</a> (Frankfurt U.) ; <a href="https://cds.cern.ch/search?f=author&p=Garc%C3%ADa%2C%20A.R.&ln=hr">García, A.R.</a> (Madrid, CIEMAT) ; <a href="https://cds.cern.ch/search?f=author&p=Gawlik%2C%20A.&ln=hr">Gawlik, A.</a> (Lodz U.) ; <a href="https://cds.cern.ch/search?f=author&p=Glodariu%2C%20T.&ln=hr">Glodariu, T.</a> (Bucharest, IFIN-HH) ; <a href="https://cds.cern.ch/search?f=author&p=Gon%C3%A7alves%2C%20I.F.&ln=hr">Gonçalves, I.F.</a> (Lisbon, IST) ; <a href="https://cds.cern.ch/search?f=author&p=Gonz%C3%A1lez-Romero%2C%20E.&ln=hr">González-Romero, E.</a> (Madrid, CIEMAT) ; <a href="https://cds.cern.ch/search?f=author&p=Goverdovski%2C%20A.&ln=hr">Goverdovski, A.</a> (Obninsk, Inst. 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Dept. ; CERN)</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;">2024-12-02</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">20</td></tr>  <tr><td class="formatRecordLabel"> Note </td><td style="padding-left:5px;">20 pages, 19 figures, submitted to Phys. Rev. C</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"> Accelerator/Facility, Experiment </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?p=CERN%20PS&f=693__a">CERN PS</a> ; <a href="https://cds.cern.ch/search?p=nTOF&f=693__e">nTOF</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">The design of fast reactors burning MOX fuels requires accurate capture and fission cross sections. For the particular case of neutron capture on 242Pu, the NEA recommends that an accuracy of 8-12% should be achieved in the fast energy region (2 keV-500 keV) compared to their estimation of 35% for the current uncertainty. Integral irradiation experiments suggest that the evaluated cross section of the JEFF-3.1 library overestimates the 242Pu(n,{\gamma}) cross section by 14% in the range between 1 keV and 1 MeV. In addition, the last measurement at LANSCE reported a systematic reduction of 20-30% in the 1-40 keV range relative to the evaluated libraries and previous data sets. In the present work this cross section has been determined up to 600 keV in order to solve the mentioned discrepancies. A 242Pu target of 95(4) mg enriched to 99.959% was irradiated at the n TOF-EAR1 facility at CERN. The capture cross section of 242Pu has been obtained between 1 and 600 keV with a systematic uncertainty (dominated by background subtraction) between 8 and 12%, reducing the current uncertainties of 35% and achieving the accuracy requested by the NEA in a large energy range. The shape of the cross section has been analyzed in terms of average resonance parameters using the FITACS code as implemented in SAMMY, yielding results compatible with our recent analysis of the resolved resonance region.The results are in good agreement with the data of Wisshak and K&quot;appeler and on average 10-14% below JEFF-3.2 from 1 to 250 keV, which helps to achieve consistency between integral experiments and cross section data. At higher energies our results show a reasonable agreement within uncertainties with both ENDF/B-VII.1 and JEFF-3.2. Our results indicate that the last experiment from DANCE underestimates the capture cross section of 242Pu by as much as 40% above a few keV.</td></tr> <tr><td class="formatRecordLabel"> Other source </td><td style="padding-left:5px;"><a href="http://inspirehep.net/record/2854936">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/2918776/plots#0"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2918776/files/Fig0_Pu242_ng_Previous_measurements_evaluations_intro_legend_fullnames_Cut1keV_svg-tex.png" title=" Capture cross section of $^{242}$Pu in the energy range from 1 to 250 keV. The previous experimental data sets available in EXFOR are compared to the cross section reported in the main evaluated files." width="200px"/></a> <a href="/record/2918776/plots#1"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2918776/files/Fig1_Sketch_plus_radiography_realSampleAssembly_bw.png" title=" {Top: Sketch of one of the targets ($^{242}$Pu on a thin Al backing)}. Bottom left: $\alpha$-radiography of one of the targets showing the homogeneity of the $^{242}$Pu deposits. Bottom right: Mounted stack of $^{242}$Pu targets placed in a purpose built holder." width="200px"/></a> <a href="/record/2918776/plots#2"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2918776/files/Fig2_Setup_sampleassembly_placed_vertical.png" title=" Top: The four C$_{6}$D$_{6}$ scintillation detectors used to measure the capture $\gamma$-rays in n\_TOF-EAR1. Bottom: View of the $^{242}$Pu 7-target assembly placed in the neutron beam." width="200px"/></a> <a href='/record/2918776/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() === "više" ? "less" : "više"); },function(){ $(this).siblings(".longCaption").hide('fast'); var thisElem = $(this); thisElem.text(thisElem.text() === "više" ? 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For the particular case of neutron capture on 242Pu, the NEA recommends that an accuracy of 8-12% should be achieved in the fast energy region (2 keV-500 keV) compared to their estimation of 35% for the current uncertainty. Integral irradiation experiments suggest that the evaluated cross section of the JEFF-3.1 library overestimates the 242Pu(n,{\\gamma}) cross section by 14% in the range between 1 keV and 1 MeV. In addition, the last measurement at LANSCE reported a systematic reduction of 20-30% in the 1-40 keV range relative to the evaluated libraries and previous data sets. In the present work this cross section has been determined up to 600 keV in order to solve the mentioned discrepancies. A 242Pu target of 95(4) mg enriched to 99.959% was irradiated at the n TOF-EAR1 facility at CERN. The capture cross section of 242Pu has been obtained between 1 and 600 keV with a systematic uncertainty (dominated by background subtraction) between 8 and 12%, reducing the current uncertainties of 35% and achieving the accuracy requested by the NEA in a large energy range. The shape of the cross section has been analyzed in terms of average resonance parameters using the FITACS code as implemented in SAMMY, yielding results compatible with our recent analysis of the resolved resonance region.The results are in good agreement with the data of Wisshak and K\\\"appeler and on average 10-14% below JEFF-3.2 from 1 to 250 keV, which helps to achieve consistency between integral experiments and cross section data. At higher energies our results show a reasonable agreement within uncertainties with both ENDF/B-VII.1 and JEFF-3.2. Our results indicate that the last experiment from DANCE underestimates the capture cross section of 242Pu by as much as 40% above a few keV." }); // ]]> </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=hr">Pretraži</a> :: <a class="footer" href="https://cds.cern.ch/submit?ln=hr">Prihvati</a> :: <a class="footer" href="https://cds.cern.ch/youraccount/display?ln=hr">Personaliziraj</a> :: <a class="footer" href="https://cds.cern.ch/help/?ln=hr">Pomoć</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 /> Održava <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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