[2110.00303] Direct measurement of the 13C(伪,n)16O cross section into the s-process Gamow peak

<!DOCTYPE html> <html lang="en"> <head> <title>[2110.00303] Direct measurement of the 13C(伪,n)16O cross section into the s-process Gamow peak</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="apple-touch-icon" sizes="180x180" href="/static/browse/0.3.4/images/icons/apple-touch-icon.png"> <link rel="icon" type="image/png" sizes="32x32" href="/static/browse/0.3.4/images/icons/favicon-32x32.png"> <link rel="icon" type="image/png" sizes="16x16" href="/static/browse/0.3.4/images/icons/favicon-16x16.png"> <link rel="manifest" href="/static/browse/0.3.4/images/icons/site.webmanifest"> <link rel="mask-icon" href="/static/browse/0.3.4/images/icons/safari-pinned-tab.svg" color="#5bbad5"> <meta name="msapplication-TileColor" content="#da532c"> <meta name="theme-color" content="#ffffff"> <link rel="stylesheet" type="text/css" media="screen" href="/static/browse/0.3.4/css/arXiv.css?v=20241206" /> <link rel="stylesheet" type="text/css" media="print" href="/static/browse/0.3.4/css/arXiv-print.css?v=20200611" /> <link rel="stylesheet" type="text/css" media="screen" href="/static/browse/0.3.4/css/browse_search.css" /> <script language="javascript" src="/static/browse/0.3.4/js/accordion.js" /></script> <link rel="canonical" href="https://arxiv.org/abs/2110.00303"/> <meta name="description" content="Abstract page for arXiv paper 2110.00303: Direct measurement of the 13C(伪,n)16O cross section into the s-process Gamow peak"><meta property="og:type" content="website" /> <meta property="og:site_name" content="arXiv.org" /> <meta property="og:title" content="Direct measurement of the 13C(伪,n)16O cross section into the s-process Gamow peak" /> <meta property="og:url" content="https://arxiv.org/abs/2110.00303v1" /> <meta property="og:image" content="/static/browse/0.3.4/images/arxiv-logo-fb.png" /> <meta property="og:image:secure_url" content="/static/browse/0.3.4/images/arxiv-logo-fb.png" /> <meta property="og:image:width" content="1200" /> <meta property="og:image:height" content="700" /> <meta property="og:image:alt" content="arXiv logo"/> <meta property="og:description" content="One of the main neutron sources for the astrophysical s-process is the reaction 13C(伪,n)16O, taking place in thermally pulsing Asymptotic Giant Branch stars at temperatures around 90 MK. To model the nucleosynthesis during this process the reaction cross section needs to be known in the 150-230keV energy window (Gamow peak). At these sub-Coulomb energies cross section direct measurements are severely affected by the low event rate, making us rely on input from indirect methods and extrapolations from higher-energy direct data. This leads to an uncertainty in the cross section at the relevant energies too high to reliably constrain the nuclear physics input to s-process calculations. We present the results from a new deep-underground measurement of 13C(伪,n)16O, covering the energy range 230-300keV, with drastically reduced uncertainties over previous measurements and for the first time providing data directly inside the s-process Gamow peak. Selected stellar models have been computed to estimate the impact of our revised reaction rate. For stars of nearly solar composition, we find sizeable variations of some isotopes, whose production is influenced by the activation of close-by branching points that are sensitive to the neutron density, in particular the two radioactive nuclei 60Fe and 205Pb, as well as 152Gd"/> <meta name="twitter:site" content="@arxiv"/> <meta name="twitter:card" content="summary"/> <meta name="twitter:title" content="Direct measurement of the 13C(伪,n)16O cross section into the..."/> <meta name="twitter:description" content="One of the main neutron sources for the astrophysical s-process is the reaction 13C(伪,n)16O, taking place in thermally pulsing Asymptotic Giant Branch stars at temperatures around 90 MK. To..."/> <meta name="twitter:image" content="https://static.arxiv.org/icons/twitter/arxiv-logo-twitter-square.png"/> <meta name="twitter:image:alt" content="arXiv logo"/> <link rel="stylesheet" media="screen" type="text/css" href="/static/browse/0.3.4/css/tooltip.css"/><link rel="stylesheet" media="screen" type="text/css" href="https://static.arxiv.org/js/bibex-dev/bibex.css?20200709"/> <script src="/static/browse/0.3.4/js/mathjaxToggle.min.js" type="text/javascript"></script> <script src="//code.jquery.com/jquery-latest.min.js" type="text/javascript"></script> <script src="//cdn.jsdelivr.net/npm/js-cookie@2/src/js.cookie.min.js" type="text/javascript"></script> <script src="//cdn.jsdelivr.net/npm/dompurify@2.3.5/dist/purify.min.js"></script> <script src="/static/browse/0.3.4/js/toggle-labs.js?20241022" type="text/javascript"></script> <script src="/static/browse/0.3.4/js/cite.js" type="text/javascript"></script><meta name="citation_title" content="Direct measurement of the 13C({\alpha},n)16O cross section into the s-process Gamow peak" /><meta name="citation_author" content="Ciani, G. F." /><meta name="citation_author" content="Csedreki, L." /><meta name="citation_author" content="Rapagnani, D." /><meta name="citation_author" content="Aliotta, M." /><meta name="citation_author" content="Balibrea-Correa, J." /><meta name="citation_author" content="Barile, F." /><meta name="citation_author" content="Bemmerer, D." /><meta name="citation_author" content="Best, A." /><meta name="citation_author" content="Boeltzig, A." /><meta name="citation_author" content="Broggini, C." /><meta name="citation_author" content="Bruno, C. 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R." /><meta name="citation_author" content="Paticchio, V." /><meta name="citation_author" content="Perrino, R." /><meta name="citation_author" content="Piatti, D." /><meta name="citation_author" content="Prati, P." /><meta name="citation_author" content="Schiavulli, L." /><meta name="citation_author" content="Stockel, K." /><meta name="citation_author" content="Straniero, O." /><meta name="citation_author" content="Szucs, T." /><meta name="citation_author" content="Takacs, M. P." /><meta name="citation_author" content="Terrasi, F." /><meta name="citation_author" content="Vescovi, D." /><meta name="citation_author" content="Zavatarelli, S ." /><meta name="citation_doi" content="10.1103/PhysRevLett.127.152701" /><meta name="citation_date" content="2021/10/01" /><meta name="citation_online_date" content="2021/10/01" /><meta name="citation_pdf_url" content="http://arxiv.org/pdf/2110.00303" /><meta name="citation_arxiv_id" content="2110.00303" /><meta name="citation_abstract" content="One of the main neutron sources for the astrophysical s-process is the reaction 13C({\alpha},n)16O, taking place in thermally pulsing Asymptotic Giant Branch stars at temperatures around 90 MK. To model the nucleosynthesis during this process the reaction cross section needs to be known in the 150-230keV energy window (Gamow peak). At these sub-Coulomb energies cross section direct measurements are severely affected by the low event rate, making us rely on input from indirect methods and extrapolations from higher-energy direct data. This leads to an uncertainty in the cross section at the relevant energies too high to reliably constrain the nuclear physics input to s-process calculations. We present the results from a new deep-underground measurement of 13C({\alpha},n)16O, covering the energy range 230-300keV, with drastically reduced uncertainties over previous measurements and for the first time providing data directly inside the s-process Gamow peak. Selected stellar models have been computed to estimate the impact of our revised reaction rate. For stars of nearly solar composition, we find sizeable variations of some isotopes, whose production is influenced by the activation of close-by branching points that are sensitive to the neutron density, in particular the two radioactive nuclei 60Fe and 205Pb, as well as 152Gd" /> </head> <body class="with-cu-identity"> <div class="flex-wrap-footer"> <header> <a href="#content" class="is-sr-only">Skip to main content</a>  <div class="columns is-vcentered is-hidden-mobile" id="cu-identity"> <div class="column" id="cu-logo"> <a href="https://www.cornell.edu/"><img src="/static/browse/0.3.4/images/icons/cu/cornell-reduced-white-SMALL.svg" alt="Cornell University" /></a> </div><div class="column" id="support-ack"> <span id="support-ack-url">We gratefully acknowledge support from the Simons Foundation, <a href="https://info.arxiv.org/about/ourmembers.html">member institutions</a>, and all contributors.</span> <a href="https://info.arxiv.org/about/donate.html" 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the s-process Gamow peak</h1> <div class="authors"><span class="descriptor">Authors:</span><a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=G.F.Ciani" rel="nofollow">G.F.Ciani</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=L.Csedreki" rel="nofollow">L.Csedreki</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=D.Rapagnani" rel="nofollow">D.Rapagnani</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=M.Aliotta" rel="nofollow">M.Aliotta</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=J.Balibrea-Correa" rel="nofollow">J.Balibrea-Correa</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=F.Barile" rel="nofollow">F.Barile</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=D.Bemmerer" rel="nofollow">D.Bemmerer</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=A.Best" rel="nofollow">A.Best</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=A.Boeltzig" rel="nofollow">A.Boeltzig</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=C.Broggini" rel="nofollow">C.Broggini</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=C.G.Bruno" rel="nofollow">C.G.Bruno</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=A.Caciolli" rel="nofollow">A.Caciolli</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=F.Cavanna" rel="nofollow">F.Cavanna</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=T.Chillery" rel="nofollow">T.Chillery</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=P.Corvisiero" rel="nofollow">P.Corvisiero</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=S.Cristallo" rel="nofollow">S.Cristallo</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=T.Davinson" rel="nofollow">T.Davinson</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=R.Depalo" rel="nofollow">R.Depalo</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=A.DiLeva" rel="nofollow">A.DiLeva</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=Z.Elekes" rel="nofollow">Z.Elekes</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=F.Ferraro" rel="nofollow">F.Ferraro</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=E.Fiore" rel="nofollow">E.Fiore</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=A.Formicola" rel="nofollow">A.Formicola</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=Zs.Fulop" rel="nofollow">Zs.Fulop</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=G.Gervino" rel="nofollow">G.Gervino</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=A.Guglielmetti" rel="nofollow">A.Guglielmetti</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=C.Gustavino" rel="nofollow">C.Gustavino</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=Gyurky,+G" rel="nofollow">Gy. Gyurky</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=G.Imbriani" rel="nofollow">G.Imbriani</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=M.Junker" rel="nofollow">M.Junker</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=M.Lugaro" rel="nofollow">M.Lugaro</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=P.Marigo" rel="nofollow">P.Marigo</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=E.Masha" rel="nofollow">E.Masha</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=R.Menegazzo" rel="nofollow">R.Menegazzo</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=V.Mossa" rel="nofollow">V.Mossa</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=F.R.Pantaleo" rel="nofollow">F.R.Pantaleo</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=V.Paticchio" rel="nofollow">V.Paticchio</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=R.Perrino" rel="nofollow">R.Perrino</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=D.Piatti" rel="nofollow">D.Piatti</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=P.Prati" rel="nofollow">P.Prati</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=L.Schiavulli" rel="nofollow">L.Schiavulli</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=K.Stockel" rel="nofollow">K.Stockel</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=O.Straniero" rel="nofollow">O.Straniero</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=T.Szucs" rel="nofollow">T.Szucs</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=M.P.Takacs" rel="nofollow">M.P.Takacs</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=F.Terrasi" rel="nofollow">F.Terrasi</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=D.Vescovi" rel="nofollow">D.Vescovi</a>, <a href="https://arxiv.org/search/nucl-ex?searchtype=author&query=.Zavatarelli,+S" rel="nofollow">S .Zavatarelli</a></div> <div id="download-button-info" hidden>View a PDF of the paper titled Direct measurement of the 13C({\alpha},n)16O cross section into the s-process Gamow peak, by G.F.Ciani and 47 other authors</div> <a class="mobile-submission-download" href="/pdf/2110.00303">View PDF</a> <blockquote class="abstract mathjax"> <span class="descriptor">Abstract:</span>One of the main neutron sources for the astrophysical s-process is the reaction 13C({\alpha},n)16O, taking place in thermally pulsing Asymptotic Giant Branch stars at temperatures around 90 MK. To model the nucleosynthesis during this process the reaction cross section needs to be known in the 150-230keV energy window (Gamow peak). At these sub-Coulomb energies cross section direct measurements are severely affected by the low event rate, making us rely on input from indirect methods and extrapolations from higher-energy direct data. This leads to an uncertainty in the cross section at the relevant energies too high to reliably constrain the nuclear physics input to s-process calculations. We present the results from a new deep-underground measurement of 13C({\alpha},n)16O, covering the energy range 230-300keV, with drastically reduced uncertainties over previous measurements and for the first time providing data directly inside the s-process Gamow peak. Selected stellar models have been computed to estimate the impact of our revised reaction rate. For stars of nearly solar composition, we find sizeable variations of some isotopes, whose production is influenced by the activation of close-by branching points that are sensitive to the neutron density, in particular the two radioactive nuclei 60Fe and 205Pb, as well as 152Gd </blockquote>  <div class="metatable"> <table summary="Additional metadata"> <tr> <td class="tablecell label">Comments:</td> <td class="tablecell comments mathjax">7 pages, 4 figures, accepted on PRL on 17th August 2021</td> </tr> <tr> <td class="tablecell label">Subjects:</td> <td class="tablecell subjects"> <span class="primary-subject">Nuclear Experiment (nucl-ex)</span></td> </tr><tr> <td class="tablecell label">Cite as:</td> <td class="tablecell arxivid"><span class="arxivid"><a href="https://arxiv.org/abs/2110.00303">arXiv:2110.00303</a> [nucl-ex]</span></td> </tr> <tr> <td class="tablecell label"> </td> <td class="tablecell arxividv">(or <span class="arxivid"> <a href="https://arxiv.org/abs/2110.00303v1">arXiv:2110.00303v1</a> [nucl-ex]</span> for this version) </td> </tr> <tr> <td class="tablecell label"> </td> <td class="tablecell arxivdoi"> <a href="https://doi.org/10.48550/arXiv.2110.00303" id="arxiv-doi-link">https://doi.org/10.48550/arXiv.2110.00303</a><div class="button-and-tooltip"> <button class="more-info" aria-describedby="more-info-desc-1"> <svg height="15" role="presentation" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="currentColor" d="M256 8C119.043 8 8 119.083 8 256c0 136.997 111.043 248 248 248s248-111.003 248-248C504 119.083 392.957 8 256 8zm0 110c23.196 0 42 18.804 42 42s-18.804 42-42 42-42-18.804-42-42 18.804-42 42-42zm56 254c0 6.627-5.373 12-12 12h-88c-6.627 0-12-5.373-12-12v-24c0-6.627 5.373-12 12-12h12v-64h-12c-6.627 0-12-5.373-12-12v-24c0-6.627 5.373-12 12-12h64c6.627 0 12 5.373 12 12v100h12c6.627 0 12 5.373 12 12v24z" class=""></path></svg> <span class="visually-hidden">Focus to learn more</span> </button>  <div role="tooltip" id="more-info-desc-1"> <span class="left-corner"></span> arXiv-issued DOI via DataCite</div> </div> </td> </tr> <tr> <td class="tablecell label"> <abbr title="Digital Object Identifier">Related DOI</abbr>: </td> <td class="tablecell doi"><a href="https://doi.org/10.1103/PhysRevLett.127.152701" data-doi="10.1103/PhysRevLett.127.152701" class="link-https link-external" rel="external noopener nofollow">https://doi.org/10.1103/PhysRevLett.127.152701</a>  <div class="button-and-tooltip"> <button class="more-info" aria-describedby="more-info-desc-1"> <svg height="15" role="presentation" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="currentColor" d="M256 8C119.043 8 8 119.083 8 256c0 136.997 111.043 248 248 248s248-111.003 248-248C504 119.083 392.957 8 256 8zm0 110c23.196 0 42 18.804 42 42s-18.804 42-42 42-42-18.804-42-42 18.804-42 42-42zm56 254c0 6.627-5.373 12-12 12h-88c-6.627 0-12-5.373-12-12v-24c0-6.627 5.373-12 12-12h12v-64h-12c-6.627 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[2110.00303] Direct measurement of the 13C(伪,n)16O cross section into the s-process Gamow peak