AMS d茅tecte un exc猫s de noyaux cosmiques

<!DOCTYPE html> <html lang="fr" dir="ltr" prefix="content: http://purl.org/rss/1.0/modules/content/ dc: http://purl.org/dc/terms/ foaf: http://xmlns.com/foaf/0.1/ og: http://ogp.me/ns# rdfs: http://www.w3.org/2000/01/rdf-schema# schema: http://schema.org/ sioc: http://rdfs.org/sioc/ns# sioct: http://rdfs.org/sioc/types# skos: http://www.w3.org/2004/02/skos/core# xsd: http://www.w3.org/2001/XMLSchema# "> <head> <meta charset="utf-8" /> <script>var _paq = _paq || [];(function(){var u=(("https:" == document.location.protocol) ? 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La derni猫re analyse des donn茅es collect茅es par le Spectrom猫tre magn茅tique alpha (AMS)聽, le d茅tecteur install茅脿 bord de la Station spatiale internationale, ont r茅v茅l茅, 脿 la surprise g茅n茅rale, un surplus de rayons cosmiques compos茅s de deut茅rons, des noyaux atomiques comptant un proton et un neutron. Rapport茅e dans un article paru dans Physical Review Letters, cette d茅couverte vient s鈥檃jouter 脿 la liste grandissante des r茅sultats surprenants obtenus par le d茅tecteur spatial. Assembl茅 au CERN, AMS a d茅tect茅 plus de 238聽milliards de rayons cosmiques, compos茅s de diverses particules, depuis le d茅but de sa p茅riode d鈥檃cquisition de donn茅es, en 2011. Les rayons cosmiques de particules se divisent en deux cat茅gories, les rayons primaires et les rayons secondaires. Les rayons cosmiques primaires sont 茅mis par des sources cosmiques, comme les supernovas, tandis que les rayons cosmiques secondaires r茅sultent de l鈥檌nteraction entre des rayons cosmiques primaires et le milieu interstellaire. Pour mener sa derni猫re 茅tude, la collaboration聽AMS a 茅pluch茅 les donn茅es des 21聽millions de deut茅rons cosmiques d茅tect茅s par AMS entre mai聽2011 et avril聽2021. En 茅tudiant la variation du nombre, ou 芦聽flux聽禄, de deut茅rons en fonction de leur rigidit茅, c鈥檈st 脿 dire de l鈥檌mpulsion des particules divis茅e par leur charge 茅lectrique, l鈥櫭﹒uipe d鈥橝MS a fait des d茅couvertes surprenantes. Les deut茅rons seraient cens茅s se former de la m锚me mani猫re que les noyaux d鈥檋茅lium-3, lors de collisions entre des noyaux d鈥檋茅lium-4 primaires et d鈥檃utres noyaux du milieu interstellaire. Si tel 茅tait le cas, le rapport entre le flux de deut茅rons et de noyaux d鈥檋茅lium-4 devrait 锚tre le m锚me que le rapport entre le flux de noyaux d鈥檋茅lium-3 et celui de noyaux d鈥檋茅lium-4. Ce n鈥檈st pas ce qu鈥橝MS a d茅tect茅. Les donn茅es collect茅es par AMS montrent qu鈥檃u-del脿 d鈥檜ne rigidit茅 de 4,5聽gigavolts聽(GV), ces rapports divergent, le rapport deut茅rons sur h茅lium-4 diminuant moins vite que le rapport h茅lium-3 sur h茅lium-4 脿 mesure que la rigidit茅 augmente. En outre, et contre toute attente, au-del脿 d鈥檜ne rigidit茅 de 13聽GV, les donn茅es montrent que le flux de deut茅rons devient quasiment identique 脿 celui des protons, qui forment des rayons cosmiques primaires. Pour simplifier, le d茅tecteur AMS a observ茅 plus de deut茅rons que pr茅vu issus de collisions entre de l鈥檋茅lium-4 primaire et le milieu interstellaire. 芦聽La mesure des deut茅rons est rendue difficile par l鈥檌mportant bruit de fond des protons cosmiques, explique Samuel Ting, porte-parole de la collaboration AMS. Ces r茅sultats inattendus ne font que confirmer notre m茅connaissance des rayons cosmiques. La future am茅lioration d鈥橝MS doit multiplier par trois l鈥檃cceptance du d茅tecteur, lui permettant de mesurer tous les rayons cosmiques charg茅s avec une pr茅cision d鈥檜n pourcent, afin d鈥檕ffrir un socle exp茅rimental pour l鈥櫭﹍aboration d鈥檜ne th茅orie coh茅rente des rayons cosmiques.聽禄 Plus d鈥檌nformations sur ce sujet, sur les autres d茅couvertes de la collaboration聽AMS ainsi que sur le projet d鈥檃m茅lioration du d茅tecteur dans cet article." /> <meta property="og:image" content="https://cds.cern.ch/images//file?size=medium" /> <meta name="twitter:card" content="summary_large_image" /> <meta name="twitter:description" content="Les rayons cosmiques ne cessent de d茅concerter les scientifiques. La derni猫re analyse des donn茅es collect茅es par le Spectrom猫tre magn茅tique alpha (AMS)聽, le d茅tecteur install茅脿 bord de la Station spatiale internationale, ont r茅v茅l茅, 脿 la surprise g茅n茅rale, un surplus de rayons cosmiques compos茅s de deut茅rons, des noyaux atomiques comptant un proton et un neutron. Rapport茅e dans un article paru dans Physical Review Letters, cette d茅couverte vient s鈥檃jouter 脿 la liste grandissante des r茅sultats surprenants obtenus par le d茅tecteur spatial. Assembl茅 au CERN, AMS a d茅tect茅 plus de 238聽milliards de rayons cosmiques, compos茅s de diverses particules, depuis le d茅but de sa p茅riode d鈥檃cquisition de donn茅es, en 2011. Les rayons cosmiques de particules se divisent en deux cat茅gories, les rayons primaires et les rayons secondaires. Les rayons cosmiques primaires sont 茅mis par des sources cosmiques, comme les supernovas, tandis que les rayons cosmiques secondaires r茅sultent de l鈥檌nteraction entre des rayons cosmiques primaires et le milieu interstellaire. Pour mener sa derni猫re 茅tude, la collaboration聽AMS a 茅pluch茅 les donn茅es des 21聽millions de deut茅rons cosmiques d茅tect茅s par AMS entre mai聽2011 et avril聽2021. En 茅tudiant la variation du nombre, ou 芦聽flux聽禄, de deut茅rons en fonction de leur rigidit茅, c鈥檈st 脿 dire de l鈥檌mpulsion des particules divis茅e par leur charge 茅lectrique, l鈥櫭﹒uipe d鈥橝MS a fait des d茅couvertes surprenantes. Les deut茅rons seraient cens茅s se former de la m锚me mani猫re que les noyaux d鈥檋茅lium-3, lors de collisions entre des noyaux d鈥檋茅lium-4 primaires et d鈥檃utres noyaux du milieu interstellaire. Si tel 茅tait le cas, le rapport entre le flux de deut茅rons et de noyaux d鈥檋茅lium-4 devrait 锚tre le m锚me que le rapport entre le flux de noyaux d鈥檋茅lium-3 et celui de noyaux d鈥檋茅lium-4. Ce n鈥檈st pas ce qu鈥橝MS a d茅tect茅. Les donn茅es collect茅es par AMS montrent qu鈥檃u-del脿 d鈥檜ne rigidit茅 de 4,5聽gigavolts聽(GV), ces rapports divergent, le rapport deut茅rons sur h茅lium-4 diminuant moins vite que le rapport h茅lium-3 sur h茅lium-4 脿 mesure que la rigidit茅 augmente. En outre, et contre toute attente, au-del脿 d鈥檜ne rigidit茅 de 13聽GV, les donn茅es montrent que le flux de deut茅rons devient quasiment identique 脿 celui des protons, qui forment des rayons cosmiques primaires. Pour simplifier, le d茅tecteur AMS a observ茅 plus de deut茅rons que pr茅vu issus de collisions entre de l鈥檋茅lium-4 primaire et le milieu interstellaire. 芦聽La mesure des deut茅rons est rendue difficile par l鈥檌mportant bruit de fond des protons cosmiques, explique Samuel Ting, porte-parole de la collaboration AMS. Ces r茅sultats inattendus ne font que confirmer notre m茅connaissance des rayons cosmiques. La future am茅lioration d鈥橝MS doit multiplier par trois l鈥檃cceptance du d茅tecteur, lui permettant de mesurer tous les rayons cosmiques charg茅s avec une pr茅cision d鈥檜n pourcent, afin d鈥檕ffrir un socle exp茅rimental pour l鈥櫭﹍aboration d鈥檜ne th茅orie coh茅rente des rayons cosmiques.聽禄 Plus d鈥檌nformations sur ce sujet, sur les autres d茅couvertes de la collaboration聽AMS ainsi que sur le projet d鈥檃m茅lioration du d茅tecteur dans cet article." /> <meta name="twitter:site" content="@cern" /> <meta name="twitter:title" content="AMS d茅tecte un exc猫s de noyaux cosmiques" /> <meta name="twitter:image" content="https://cds.cern.ch/images//file?size=medium" /> <meta name="Generator" content="Drupal 10 (https://www.drupal.org)" /> <meta name="MobileOptimized" content="width" /> <meta name="HandheldFriendly" content="true" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <link rel="icon" href="/sites/default/themes/custom/cernpublic/favicon.ico" type="image/vnd.microsoft.icon" /> 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class="view-header"> <p>Actualit茅s, opinions, annonces et articles 脿 la une</p> </div> <div class="view-content clearfix"> <div class="views-row"> <div data-history-node-id="191265" id="preview-card" class="component-preview-cards box-pattern" style="background:url('/sites/default/files/styles/large/public/2024-11/202410-267_167.jpg?itok=9FkCAvwX') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-11/202410-267_167.jpg?itok=9FkCAvwX" class="component-preview-cards box-pattern"> <a class="box-link" target="" href="/fr/news/press-release/cern/cern-council-selects-mark-thomson-next-director-general-starting-2026"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/fr/news/press-release/cern/cern-council-selects-mark-thomson-next-director-general-starting-2026" hreflang="fr" title="Le Conseil du CERN choisit Mark Thomson comme prochain directeur g茅n茅ral du CERN 脿 compter de 2026"> <span> Le Conseil du CERN choisit Mark Thomson comme... </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> At CERN </div> <div class="preview-card__category" style="color:"> Press release </div> <div class="preview-card__date" style="color:"> <time datetime="2024-11-06T11:00:02Z">6 novembre, 2024</time> </div> </div> </div> </div> </div> </div> <div class="views-row"> <div data-history-node-id="191152" id="preview-card--2" class="component-preview-cards box-pattern" style="background:url('/sites/default/files/styles/large/public/2024-10/ba1938f2-89a3-4bdd-bd79-5b83ed6f3e35.JPG?itok=Lh4ptU3U') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-10/ba1938f2-89a3-4bdd-bd79-5b83ed6f3e35.JPG?itok=Lh4ptU3U" class="component-preview-cards 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style="background:url('/sites/default/files/styles/large/public/2024-10/Picture%201.jpg?itok=YeI6iEmy') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-10/Picture%201.jpg?itok=YeI6iEmy" class="component-preview-cards box-pattern"> <a class="box-link" target="" href="/fr/news/press-release/physics/particle-physicists-chart-course-future"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/fr/news/press-release/physics/particle-physicists-chart-course-future" hreflang="fr" title="La physique des particules dessine son avenir"> <span> La physique des particules dessine son avenir... </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Physics </div> <div class="preview-card__category" style="color:"> Press release </div> <div class="preview-card__date" style="color:"> <time datetime="2024-10-11T09:08:31Z">11 octobre, 2024</time> </div> </div> </div> </div> </div> </div> <div class="views-row"> <div data-history-node-id="191077" id="preview-card--4" class="component-preview-cards box-pattern" style="background:url('/sites/default/files/styles/large/public/2024-10/10-Family-photo%20%281%29.jpg?itok=UtnK0P4h') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-10/10-Family-photo%20%281%29.jpg?itok=UtnK0P4h" class="component-preview-cards box-pattern"> <a class="box-link" target="" href="/fr/news/press-release/cern/blowing-out-70-candles-cern-celebrates-seven-decades-discoveries-and-looks"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/fr/news/press-release/cern/blowing-out-70-candles-cern-celebrates-seven-decades-discoveries-and-looks" hreflang="fr" title="Le CERN souffle ses 70 bougies, l鈥檕ccasion de c茅l茅brer sept d茅cennies de d茅couvertes et de se projeter vers un futur brillant pour la science et l鈥檌nnovation"> <span> Le CERN souffle ses 70 bougies, l鈥檕ccasion de... </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> At CERN </div> <div class="preview-card__category" style="color:"> Press release </div> <div class="preview-card__date" style="color:"> <time datetime="2024-10-01T10:00:00Z">1 octobre, 2024</time> </div> </div> </div> </div> </div> </div> </div> <div class="view-footer"> <p class="cern-btn"><a class="cern-btn" href="/fr/news?audience=23">Derni猫res actualit茅s</a></p> </div> </div> </div> </div> <div class="col-xs-0 col-sm-0 col-md-6 col-lg-6 col-item-megamenu"> <div 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La derni猫re analyse des donn茅es collect茅es par le <a href="https://ams02.space/">Spectrom猫tre magn茅tique alpha (AMS)</a> , le d茅tecteur install茅脿 bord de la Station spatiale internationale, ont r茅v茅l茅, 脿 la surprise g茅n茅rale, un surplus de <a href="https://home.cern/science/physics/cosmic-rays-particles-outer-space">rayons cosmiques</a> compos茅s de deut茅rons, des noyaux atomiques comptant un proton et un neutron.</p> <p>Rapport茅e dans un <a href="https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.132.261001">article</a> paru dans <em>Physical Review Letters</em>, cette d茅couverte vient s鈥檃jouter 脿 la liste grandissante des <a href="https://ams02.space/publications">r茅sultats</a> surprenants obtenus par le d茅tecteur spatial. Assembl茅 au CERN, AMS a d茅tect茅 plus de 238 milliards de rayons cosmiques, compos茅s de diverses particules, depuis le d茅but de sa p茅riode d鈥檃cquisition de donn茅es, en 2011.</p> <p>Les rayons cosmiques de particules se divisent en deux cat茅gories, les rayons primaires et les rayons secondaires. Les rayons cosmiques primaires sont 茅mis par des sources cosmiques, comme les supernovas, tandis que les rayons cosmiques secondaires r茅sultent de l鈥檌nteraction entre des rayons cosmiques primaires et le milieu interstellaire.</p> <p>Pour mener sa derni猫re 茅tude, la collaboration AMS a 茅pluch茅 les donn茅es des 21 millions de deut茅rons cosmiques d茅tect茅s par AMS entre mai 2011 et avril 2021. En 茅tudiant la variation du nombre, ou 芦 flux 禄, de deut茅rons en fonction de leur rigidit茅, c鈥檈st 脿 dire de l鈥檌mpulsion des particules divis茅e par leur charge 茅lectrique, l鈥櫭﹒uipe d鈥橝MS a fait des d茅couvertes surprenantes.</p> <p>Les deut茅rons seraient cens茅s se former de la m锚me mani猫re que les noyaux d鈥檋茅lium-3, lors de collisions entre des noyaux d鈥檋茅lium-4 primaires et d鈥檃utres noyaux du milieu interstellaire. Si tel 茅tait le cas, le rapport entre le flux de deut茅rons et de noyaux d鈥檋茅lium-4 devrait 锚tre le m锚me que le rapport entre le flux de noyaux d鈥檋茅lium-3 et celui de noyaux d鈥檋茅lium-4.</p> <p>Ce n鈥檈st pas ce qu鈥橝MS a d茅tect茅. Les donn茅es collect茅es par AMS montrent qu鈥檃u-del脿 d鈥檜ne rigidit茅 de 4,5 gigavolts (GV), ces rapports divergent, le rapport deut茅rons sur h茅lium-4 diminuant moins vite que le rapport h茅lium-3 sur h茅lium-4 脿 mesure que la rigidit茅 augmente. En outre, et contre toute attente, au-del脿 d鈥檜ne rigidit茅 de 13 GV, les donn茅es montrent que le flux de deut茅rons devient quasiment identique 脿 celui des protons, qui forment des rayons cosmiques primaires.</p> <p>Pour simplifier, le d茅tecteur AMS a observ茅 plus de deut茅rons que pr茅vu issus de collisions entre de l鈥檋茅lium-4 primaire et le milieu interstellaire.</p> <p>芦<em> La mesure des deut茅rons est rendue difficile par l鈥檌mportant bruit de fond des protons cosmiques</em>, explique Samuel Ting, porte-parole de la collaboration AMS. <em>Ces r茅sultats inattendus ne font que confirmer notre m茅connaissance des rayons cosmiques. La future <a href="https://cerncourier.com/a/ams-upgrade-seeks-to-solve-cosmic-conundrum/">am茅lioration</a> d鈥橝MS doit multiplier par trois l鈥檃cceptance du d茅tecteur, lui permettant de mesurer tous les rayons cosmiques charg茅s avec une pr茅cision d鈥檜n pourcent, afin d鈥檕ffrir un socle exp茅rimental pour l鈥櫭﹍aboration d鈥檜ne th茅orie coh茅rente des rayons cosmiques.</em> 禄</p> <p><em>Plus d鈥檌nformations sur ce sujet, sur les autres d茅couvertes de la collaboration AMS ainsi que sur le projet d鈥檃m茅lioration du d茅tecteur dans <a href="https://ep-news.web.cern.ch/content/highlights-alpha-magnetic-spectrometer-international-space-station">cet article</a>.</em></p> </div> <div class="news-node-full-content-tags "> <a href="/tags/ams" hreflang="en">AMS</a><a href="/tags/cosmic-rays" hreflang="en">cosmic rays</a> </div> </div> </div> </div> </div> <div class="sidebar-right col-md-3 col-sm-12 col-xs-12"> <div class="region region-right"> <section class="views-element-container block block-views 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