{"id":452,"date":"2011-09-24T00:25:22","date_gmt":"2011-09-23T22:25:22","guid":{"rendered":"http:\/\/www.gpeano.org\/oddenino\/?p=452"},"modified":"2018-02-08T12:03:24","modified_gmt":"2018-02-08T11:03:24","slug":"neutrini-piu-veloci-della-luce","status":"publish","type":"post","link":"https:\/\/liceocuneo.it\/oddenino\/neutrini-piu-veloci-della-luce\/","title":{"rendered":"Neutrini pi\u00f9 veloci della luce"},"content":{"rendered":"<p style=\"text-align: justify\"><strong>Measurement of the neutrino velocity with the OPERA detector in the CNGS beam<\/strong><br \/>\n<em>(Submitted on 22 Sep 2011)<br \/>\n<\/em>The OPERA neutrino experiment at the underground Gran Sasso Laboratory has measured the velocity of neutrinos from the CERN CNGS beam over a baseline of about 730 km with much higher accuracy than previous studies conducted with accelerator neutrinos. The measurement is based on high-statistics data taken by OPERA in the years 2009, 2010 and 2011. Dedicated upgrades of the CNGS timing system and of the OPERA detector, as well as a high precision geodesy campaign for the measurement of the neutrino baseline, allowed reaching comparable systematic and statistical accuracies. An early arrival time of CNGS muon neutrinos with respect to the one computed assuming the speed of light in vacuum of (60.7 \u00b1\u00a06.9 (stat.) \u00b1 7.4 (sys.)) ns was measured. This anomaly corresponds to a relative difference of the muon neutrino velocity with respect to the speed of light (v-c)\/c = (2.48 \u00b1 0.28 (stat.) \u00b1 0.30 (sys.)) \u00d7 10<sup>-5<\/sup>.<\/p>\n<p style=\"text-align: justify\"><strong>Misurazione con il rivelatore OPERA\u00a0della velocit\u00e0 dei neutrini nel fascio dell&#8217;esperimento CNGS<\/strong><br \/>\n<em>(Inviato il 22 settembre 2011)<\/em><br \/>\nL&#8217;esperimento sui neutrini OPERA presso il laboratorio\u00a0sotterraneo\u00a0del Gran Sasso\u00a0ha misurato\u00a0la velocit\u00e0\u00a0dei neutrini\u00a0del fascio dell&#8217;esperimento CNGS\u00a0del CERN su\u00a0una distanza di circa\u00a0730 km\u00a0con una precisione\u00a0molto pi\u00f9 elevata\u00a0rispetto agli studi\u00a0precedenti\u00a0condotti sui neutrini dell&#8217;acceleratore.\u00a0La misurazione si basa su una quantit\u00e0 statisticamente rilevante di dati ottenuti da\u00a0OPERA\u00a0negli anni\u00a02009, 2010 e\u00a02011. Aggiornamenti\u00a0specifici del\u00a0sistema di cronometraggio dell&#8217;esperimento CNGS\u00a0e\u00a0del rivelatore\u00a0OPERA,\u00a0cos\u00ec come una\u00a0campagna\u00a0di geodesia\u00a0di alta\u00a0precisione\u00a0per la misurazione\u00a0della distanza percorsa dai neutrini, hanno permesso\u00a0di raggiungere precisioni sistematiche e\u00a0statistiche confrontabili. \u00c8 stato misurato un anticipo sul tempo di arrivo dei neutrini muonici\u00a0dell&#8217;esperimento CNGS rispetto\u00a0a quello\u00a0calcolato con la\u00a0velocit\u00e0\u00a0della luce nel vuoto\u00a0di (60,7\u00a0\u00b1\u00a06,9 (errore statistico) \u00b1\u00a07.4 (errore sistematico)) ns.\u00a0Questa anomalia\u00a0corrisponde ad una differenza relativa\u00a0della velocit\u00e0 dei\u00a0neutrini\u00a0muonici\u00a0rispetto alla\u00a0velocit\u00e0 della luce\u00a0(v-c)\/c =\u00a0(2,48\u00a0\u00b1\u00a00,28 (errore statistico) \u00b1\u00a00,30 (errore sistematico))\u00a0\u00d7 10<sup>-5<\/sup>.<\/p>\n<p style=\"text-align: right\">Articolo originale:\u00a0<a title=\"Measurement of the neutrino velocity with the OPERA detector in the CNGS beam\" href=\"http:\/\/arxiv.org\/abs\/1109.4897\" target=\"_blank\" rel=\"noopener\">http:\/\/arxiv.org\/abs\/1109.4897<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Measurement of the neutrino velocity with the OPERA detector in the CNGS beam (Submitted on 22 Sep 2011) The OPERA neutrino experiment at the underground Gran Sasso Laboratory has measured the velocity of neutrinos from the CERN CNGS beam over a baseline of about 730 km with much higher accuracy than previous studies conducted with &hellip; <a href=\"https:\/\/liceocuneo.it\/oddenino\/neutrini-piu-veloci-della-luce\/\" class=\"more-link\">Continua a leggere <span class=\"screen-reader-text\">Neutrini pi\u00f9 veloci della luce<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-452","post","type-post","status-publish","format-standard","hentry","category-fisica"],"_links":{"self":[{"href":"https:\/\/liceocuneo.it\/oddenino\/wp-json\/wp\/v2\/posts\/452","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/liceocuneo.it\/oddenino\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/liceocuneo.it\/oddenino\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/liceocuneo.it\/oddenino\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/liceocuneo.it\/oddenino\/wp-json\/wp\/v2\/comments?post=452"}],"version-history":[{"count":0,"href":"https:\/\/liceocuneo.it\/oddenino\/wp-json\/wp\/v2\/posts\/452\/revisions"}],"wp:attachment":[{"href":"https:\/\/liceocuneo.it\/oddenino\/wp-json\/wp\/v2\/media?parent=452"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/liceocuneo.it\/oddenino\/wp-json\/wp\/v2\/categories?post=452"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/liceocuneo.it\/oddenino\/wp-json\/wp\/v2\/tags?post=452"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}