{"id":6781,"date":"2022-10-26T16:59:15","date_gmt":"2022-10-26T14:59:15","guid":{"rendered":"https:\/\/www.cerege.fr\/?page_id=6781"},"modified":"2022-11-09T15:07:02","modified_gmt":"2022-11-09T14:07:02","slug":"ams-aster","status":"publish","type":"page","link":"https:\/\/www.cerege.fr\/fr\/equipements\/laboratoire-national-des-nucleides-cosmogeniques\/ams-aster\/","title":{"rendered":"AMS ASTER"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"6781\" class=\"elementor elementor-6781\" data-elementor-post-type=\"page\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-218c33d elementor-section-full_width elementor-section-height-min-height elementor-section-height-default elementor-section-items-middle\" data-id=\"218c33d\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6cc680f1\" data-id=\"6cc680f1\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-14787206 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"14787206\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-5d5b58e8\" data-id=\"5d5b58e8\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4a714005 elementor-widget elementor-widget-shortcode\" data-id=\"4a714005\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\"><nav aria-label=\"breadcrumbs\">\n            <div class=\"breadcrumb-container theme1\">\n                <ol>\n                                    <\/ol>\n            <\/div>\n        <\/nav>    <script type=\"application\/ld+json\">\n        {\n            \"@context\": \"http:\/\/schema.org\",\n            \"@type\": \"BreadcrumbList\",\n            \"itemListElement\": [\n                            ]\n        }\n    <\/script>\n   \n    <script>\n            <\/script>\n<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-63be865a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"63be865a\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-wide\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-2d1526cd\" data-id=\"2d1526cd\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-613565b7 elementor-widget elementor-widget-text-editor\" data-id=\"613565b7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>L&#8217;instrument ASTER est un <strong>Spectrom\u00e8tre de Masse par Acc\u00e9l\u00e9rateur<\/strong> (SMA) install\u00e9 en 2006 au CEREGE. Il constitue l&#8217;\u00e9pine dorsale du LN2C en assurant la mesure des \u00e9chantillons pr\u00e9par\u00e9s au CEREGE ou bien envoy\u00e9s par les laboratoires partenaires.<\/p><h2><span style=\"font-weight: normal;\"><br \/>Spectrom\u00e9trie de Masse par Acc\u00e9l\u00e9rateur (SMA)<\/span><\/h2><p>La spectrom\u00e9trie de masse est la technique analytique centrale de la g\u00e9ochimie isotopique. Elle permet de mesurer des <strong>rapports isotopique<\/strong> vari\u00e9s allant jusqu&#8217;\u00e0 10<sup>-6<\/sup>. Dans le cas des nucl\u00e9ides cosmog\u00e9niques, tels que le <sup>10<\/sup>Be, leur <strong>tr\u00e8s faible abondance<\/strong> implique des rapports isotopiques (par exemple <sup>10<\/sup>Be\/<sup>9<\/sup>Be) de l&#8217;ordre de 10<sup>-12<\/sup>-10<sup>-8<\/sup> pour les vari\u00e9t\u00e9s atmosph\u00e9riques et 10<sup>-14<\/sup>-10<sup>-12<\/sup> pour les vari\u00e9t\u00e9s in situ. De plus, l&#8217;existence d&#8217;<strong>isobares<\/strong> (isotopes d\u2019\u00e9l\u00e9ments diff\u00e9rents pr\u00e9sentant le m\u00eame nombre de masse : <sup>10<\/sup>B et <sup>10<\/sup>Be, <sup>36<\/sup>S et <sup>36<\/sup>Cl ou bien <sup>26<\/sup>Mg et <sup>26<\/sup>Al) dont les abondances naturelles sont beaucoup plus \u00e9lev\u00e9es que le nucl\u00e9ide cosmog\u00e9nique d&#8217;int\u00e9r\u00eat, constitue une difficult\u00e9 majeure pour ces techniques bas\u00e9es sur la s\u00e9paration de masse.<\/p><p>Des m\u00e9thodes sp\u00e9cifiques doivent donc \u00eatre mises en \u0153uvre pour <strong>abaisser le seuil de d\u00e9tection de plusieurs ordres de grandeur<\/strong> et assurer une bonne s\u00e9paration des isobares. La Spectrom\u00e9trie de Masse par Acc\u00e9l\u00e9rateur (SMA) combine les approches classiques de la <strong>spectrom\u00e9trie de masse<\/strong> permettant la s\u00e9lection par d\u00e9flexion diff\u00e9rentielle des faisceaux d&#8217;ions dans des champ magn\u00e9tique en fonction du nombre de masse avec des techniques des <strong>acc\u00e9l\u00e9rateurs<\/strong>, employ\u00e9es en physique des particules, permettant un \u00e9pluchage \u00e0 haute \u00e9nergie du faisceau d&#8217;ions et une s\u00e9paration des isobares par pertes diff\u00e9rentielle d&#8217;\u00e9nergie en fonction du nombre de charge.<\/p><p>Les rapports isotopiques suivants sont mesur\u00e9s en routine par l&#8217;instrument ASTER.<br \/>. <sup>10<\/sup>Be\/<sup>9<\/sup>Be<br \/>. <sup>26<\/sup>Al\/<sup>27<\/sup>Al<br \/>. <sup>36<\/sup>Cl\/<sup>35<\/sup>Cl<\/p><h2><span style=\"font-weight: normal;\"><br \/>D\u00e9veloppements<\/span><\/h2><p>Le maintien de l&#8217;instrument au meilleur niveau d&#8217;activit\u00e9 international n\u00e9cessite un travail constant de <strong>d\u00e9veloppement<\/strong> et d&#8217;<strong>optimisation<\/strong> des performances. Les caract\u00e9ristiques de l&#8217;instrument sont ainsi en permanence adapt\u00e9es pour fournir le plus au niveau de qualit\u00e9 pour les mesures effectu\u00e9es.<\/p><p>Un chantier de d\u00e9veloppement majeur actuel est la mise en place d&#8217;un <strong>Gas Filled Magnet<\/strong> (GFM), permettant un gain de pr\u00e9cision majeur sur le mesure du rapport <sup>26<\/sup>Al\/<sup>27<\/sup>Al, avec des implications de premier plan pour la mise en \u0153uvre des datations d&#8217;enfouissement.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-c589d13\" data-id=\"c589d13\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-35c266d8 elementor-widget elementor-widget-image\" data-id=\"35c266d8\" 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https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/10\/\u00a9CEREGE_ASTER_LN2C_Nucleides289-1536x960.jpg 1536w, https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/10\/\u00a9CEREGE_ASTER_LN2C_Nucleides289-scaled.jpg 2048w, https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/10\/\u00a9CEREGE_ASTER_LN2C_Nucleides289-18x12.jpg 18w, https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/10\/\u00a9CEREGE_ASTER_LN2C_Nucleides289-1320x825.jpg 1320w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a>\n\t\t\t<\/div><\/figure>\n\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>L&#8217;instrument ASTER est un Spectrom\u00e8tre de Masse par Acc\u00e9l\u00e9rateur (SMA) install\u00e9 en 2006 au CEREGE. Il constitue l&#8217;\u00e9pine dorsale du LN2C en assurant la mesure des \u00e9chantillons pr\u00e9par\u00e9s au CEREGE [&hellip;]<\/p>\n","protected":false},"author":551,"featured_media":6496,"parent":6461,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-6781","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"publishpress_future_action":{"enabled":false,"date":"2026-04-12 02:58:34","action":"change-status","newStatus":"draft","terms":[],"taxonomy":"","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/pages\/6781","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/users\/551"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/comments?post=6781"}],"version-history":[{"count":5,"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/pages\/6781\/revisions"}],"predecessor-version":[{"id":7449,"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/pages\/6781\/revisions\/7449"}],"up":[{"embeddable":true,"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/pages\/6461"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/media\/6496"}],"wp:attachment":[{"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/media?parent=6781"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}