Overview and accomplishments of the Borexino experiment

[摘要] The Borexino experiment is running at the Laboratori del Gran Sasso in Italy since 2007. Its technical distinctive feature is the unprecedented ultralow background of the inner scintillating core, which is the basis of the outstanding achievements accumulated by the experiment. In this talk, after recalling the main features of the detector, the impressive solar data gathered so far by the experiment will be summarized, with special emphasis to the most recent and prominent result concerning the detection of the fundamental pp solar neutrino flux, which is the direct probe of the engine mechanism powering our star. Such a milestone measurement puts Borexino in the unique situation of being the only experiment able to do solar neutrino spectroscopy over the entire solar spectrum; the counterpart of this peculiar status in the oscillation interpretation of the data is the capability of Borexino alone to perform the full validation across the solar energy range of the MSW-LMA paradigm. The talk will be concluded highlighting the perspectives for the final stage of the solar program of the experiment, centered on the goal to fully complete the solar spectroscopy with the missing piece of the CNO neutrinos. If successful, such a measurement would represent the final crowning of the long quest of Borexino to unravel all the properties of the neutrinos from the Sun.

[发布机构] Dipartimento di Fisica, Universitá degli Studi e INFN, Milano; 20133, Italy^1;Physik-Department and Excellence Cluster Universe, Technische Universität München, Garching; 85748, Germany^2;Chemical Engineering Department, Princeton University, Princeton; NJ; 08544, United States^3;Institut fur Experimentalphysik, Universität, Hamburg; 22761, Germany^4;INFN Laboratori Nazionali Del Gran Sasso, Assergi (AQ); 67010, Italy^5;Physics Department, Virginia Polytechnic Institute, State University, Blacksburg; VA; 24061, United States^6;Physics Department, Princeton University, Princeton; NJ; 08544, United States^7;Dipartimento di Fisica, Universitá degli Studi e INFN, Genova; 16146, Italy^8;Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow; 119234, Russia; (10) Gran Sasso Science Institute (INFN), L'Aquila; 67100, Italy; (11) St. Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, Gatchina; 188350, Russia; (12) NRC Kurchatov Institute, Moscow; 123182, Russia; (13) Joint Institute for Nuclear Research, Dubna; 141980, Russia; (14) AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, Paris, Cedex; 75205, France; (15) Department of Physics, University of Houston, Houston; TX; 77204, United States; (16) M. Smoluchowski Institute of Physics, Jagiellonian University, Krakow; 30059, Poland; (17) Kiev Institute for Nuclear Research, Kiev; 06380, Ukraine; (18) Department of Physics, Technische Universität Dresden, Dresden; 01062, Germany; (19) National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe highway 31, Moscow; 115409, Russia; (20) Max-Planck-Institut für Kernphysik, Heidelberg; 69117, Germany; (21) Dipartimento di Fisica e Scienze della Terra Universitá degli Studi di Ferrara e INFN, Via Saragat 1-44122, Ferrara, Italy; (22) Dipartimento di Chimica, Biologia e Biotecnologie, Universitá degli Studi e INFN, Perugia; 06123, Italy; (23) Amherst Center for Fundamental Interactions, Physics Department, University of Massachusetts, Amherst; MA; 01003, United States; (24) Physics and Astronomy Department, University of California Los Angeles (UCLA), Los Angeles; CA; 90095, United States; (25) Institute of Physics and Excellence Cluster PRISMA, Johannes Gutenberg Universitat Mainz, Mainz; 55099, Germany^9

[关键词] Direct probe;Msw-lma;Solar data;Solar neutrino;Solar neutrino fluxes;Solar spectroscopy;Solar spectrum