{"id":1818,"date":"2015-06-03T11:39:15","date_gmt":"2015-06-03T09:39:15","guid":{"rendered":"http:\/\/www.culturalusa.com\/news\/?p=1818"},"modified":"2015-06-03T11:39:15","modified_gmt":"2015-06-03T09:39:15","slug":"cern-laccelerateur-de-particules-entame-une-nouvelle-phase-dexperiences","status":"publish","type":"post","link":"https:\/\/www.culturalusa.com\/news\/actualite\/cern-laccelerateur-de-particules-entame-une-nouvelle-phase-dexperiences\/","title":{"rendered":"CERN l&rsquo;acc\u00e9l\u00e9rateur de particules entame une nouvelle phase d&rsquo;exp\u00e9riences"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.culturalusa.com\/news\/wp-content\/uploads\/2015\/06\/cern.jpg\" alt=\"CERN\" width=\"467\" height=\"258\" class=\"aligncenter size-full wp-image-1819\" srcset=\"https:\/\/www.culturalusa.com\/news\/wp-content\/uploads\/2015\/06\/cern.jpg 467w, https:\/\/www.culturalusa.com\/news\/wp-content\/uploads\/2015\/06\/cern-275x152.jpg 275w\" sizes=\"auto, (max-width: 467px) 100vw, 467px\" \/>Le plus grand acc\u00e9l\u00e9rateur de particules du monde, le LHC du CERN, entame mercredi une nouvelle phase d&rsquo;exp\u00e9riences in\u00e9dites pour comprendre les myst\u00e8res de la mati\u00e8re et de l&rsquo;univers, apr\u00e8s deux ans de maintenance pour gagner encore en puissance.<\/p>\n<p>Le grand collisionneur de hadrons (LHC) du CERN, situ\u00e9 \u00e0 la fronti\u00e8re franco-suisse, comprend un tunnel en forme d&rsquo;anneau de 27 kilom\u00e8tres.<\/p>\n<p>Il va essayer d&rsquo;obtenir ces trois prochaines ann\u00e9es des donn\u00e9es pour comprendre les myst\u00e8res de la mati\u00e8re, avec sa puissance maximum pour des collisions de protons de 13 TeV (t\u00e9ra\u00e9lectronvolts), un niveau record d&rsquo;\u00e9nergie atteint pour la premi\u00e8re fois dans un test en mai.<\/p>\n<p>Apr\u00e8s deux ann\u00e9es de maintenance et de r\u00e9paration, et plusieurs mois de remise en service, le LHC est maintenant pr\u00eat \u00e0 prendre des donn\u00e9es de physique \u00e0 l&rsquo;\u00e9nergie record de 13 TeV, soit pr\u00e8s du double de l&rsquo;\u00e9nergie de collision de la premi\u00e8re p\u00e9riode d&rsquo;exploitation du LHC, qui a dur\u00e9 trois ans.<\/p>\n<p>Selon le CERN, \u00ab\u00a0la reprise de l&rsquo;acquisition de donn\u00e9es marquera le d\u00e9but de la Saison 2 du LHC, et ouvrira des perspectives sur des territoires inexplor\u00e9s de la physique\u00a0\u00bb.<\/p>\n<p>Les passionn\u00e9s des particules ont la possibilit\u00e9 de suivre les moments cl\u00e9s de cette journ\u00e9e sur internet, depuis l&rsquo;injection dans le LHC des faisceaux de protons et la mont\u00e9e en \u00e9nergie jusqu&rsquo;\u00e0 6,5 TeV, jusqu&rsquo;aux collisions finales et au d\u00e9but de l&rsquo;acquisition de donn\u00e9es \u00e0 13 TeV.<\/p>\n<p>Ces prochaines semaines, les scientifiques vont commencer \u00e0 enregistrer les donn\u00e9es des collisions aux \u00e9nergies in\u00e9dites. Jusqu&rsquo;\u00e0 1 milliard de collisions se produiront chaque seconde, g\u00e9n\u00e9rant des avalanches de particules dans les d\u00e9tecteurs.<\/p>\n<p>A chaque seconde de fonctionnement du LHC et de ses exp\u00e9riences, plusieurs gigaoctets de donn\u00e9es parviendront au centre de calcul du Cern pour y \u00eatre stock\u00e9s, tri\u00e9s et partag\u00e9s avec des physiciens dans le monde entier.<\/p>\n<p>Enfouies \u00e0 quelque 100 m\u00e8tres sous terre, le long de l&rsquo;anneau du LHC, se trouvent quatre \u00ab\u00a0exp\u00e9riences\u00a0\u00bb &#8211; soit 4 d\u00e9tecteurs charg\u00e9s de scruter les collisions que les scientifiques doivent ensuite analyser &#8211; de la taille d&rsquo;un immeuble.<\/p>\n<p>Atlas et CMS sont des d\u00e9tecteurs polyvalents, con\u00e7us pour explorer toute une gamme de ph\u00e9nom\u00e8nes de physique, allant du boson de Higgs \u00e0 la mati\u00e8re noire. <\/p>\n<p>L&rsquo;exp\u00e9rience Alice se sp\u00e9cialise dans l&rsquo;\u00e9tude du plasma quark-gluon, un \u00e9tat de la mati\u00e8re dont les experts pensent qu&rsquo;il aurait exist\u00e9 quelques instants apr\u00e8s le Big Bang, tandis que le d\u00e9tecteur LHCb cherche \u00e0 comprendre les diff\u00e9rences entre mati\u00e8re et antimati\u00e8re en analysant certains quarks.(AFP)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le plus grand acc\u00e9l\u00e9rateur de particules du monde, le LHC du CERN, entame mercredi une nouvelle phase d&rsquo;exp\u00e9riences in\u00e9dites pour comprendre les myst\u00e8res de la mati\u00e8re et de l&rsquo;univers, apr\u00e8s deux ans de maintenance pour gagner encore en puissance. Le grand collisionneur de hadrons (LHC) du CERN, situ\u00e9 \u00e0 la fronti\u00e8re franco-suisse, comprend un tunnel [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30],"tags":[273,272],"class_list":["post-1818","post","type-post","status-publish","format-standard","hentry","category-actualite","tag-accelerateur-de-particules","tag-cern"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.9 - aioseo.com -->\n\t<meta name=\"description\" content=\"Le plus grand acc\u00e9l\u00e9rateur de particules du monde, le LHC du CERN, entame mercredi une nouvelle phase d&#039;exp\u00e9riences in\u00e9dites pour comprendre les myst\u00e8res de la mati\u00e8re et de l&#039;univers, apr\u00e8s deux ans de maintenance pour gagner encore en puissance. 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