Recent Results from Borexino

[摘要] The Borexino experiment is taking data since 2007 at the Laboratori Nazionali del Gran Sasso in Italy accomplishing outstanding achievements in the field of neutrino physics. Its success is strongly based on the unprecedented ultra-high radio-purity of the inner scintillator core. The main features of the detector and the impressive results for solar and geo-neutrinos obtained by Borexino so far are summarized. The main focus is laid on the most recent results, i.e. the first real-time measurement of the solar pp neutrino flux and the detection of the signal induced by geo-neutrinos with a significance as high as 5.9σ. The measurement of the pp neutrino flux represents a direct probe of the major mechanism of energy production in the Sun and its observation at a significance of 10σ proves the stability of the Sun over a time of at least 105years. It further puts Borexino in the unique position of being capable to test the MSW-LMA paradigm across the whole solar energy range. The geo-neutrino data allow to infer information concerning important geophysical properties of the Earth that are also discussed. The perspectives of the final stage of the Borexino solar neutrino program that are centered on the goal of measuring the CNO neutrinos that so far escaped any observation are outlined.

[发布机构] Physik-Department and Excellence Cluster Universe, Technische Universitat München, Garching; 85748, Germany^1;Gran Sasso Science Institute (INFN), L'AQUILA; 67100, Italy^2;National Research Center Kurchatov Institute, Moscow; 123182, Russia^3;Dipartimento di Fisica, Universita Degli Studi e INFN, Milano; 20133, Italy^4;Physics Department, Princeton University, Princeton; NJ; 08544, United States^5;Dipartimento di Fisica, Universita Degli Studi e INFN, Genova; 16146, Italy^6;INFN Laboratori Nazionali Del Gran Sasso, Assergi (AQ); 67010, Italy^7;Physics Department, Virginia Polytechnic Institute, State University, Blacksburg; VA; 24061, United States^8;Lomonosov Moscow State University Skobeltsyn, Institute of Nuclear Physics, Moscow; 119234, Russia; (10) Department of Physics and Astronomy, University of Hawaii, Honolulu; HI; 96822, United States; (11) St. Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, Gatchina; 188350, Russia; (12) Joint Institute for Nuclear Research, Dubna; 141980, Russia; (13) AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, Paris Cedex 13; 75205, France; (14) Institut für Experimentalphysik, Universitat, Hamburg; 22761, Germany; (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 Universitat Dresden, Dresden; 01062, Germany; (19) National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Moscow; 115409, Russia; (20) RWTH Aachen University, Aachen; 52062, Germany; (21) IKP-2 Forschungzentrum Jülich, Jülich, 52428, Germany; (22) Physics Department, Queen's University, Kingston; ON; K7L 3N6, Canada; (23) Max-Planck-Institut für Kernphysik, Heidelberg; 69117, Germany; (24) Dipartimento di Fisica e Scienze della, Terra Universita Degli Studi di Ferrara e INFN, Via Saragat 1, Ferrara; 44122, Italy; (25) Dipartimento di Chimica, Biologia e Biotecnologie, Universita e INFN, Perugia; 06123, Italy; (26) Physics and Astronomy Department, University of California Los Angeles (UCLA), Los Angeles; CA; 90095, United States; (27) Institute of Physics and Excellence Cluster PRISMA, Johannes Gutenberg-Universitat Mainz, Mainz; 55099, Germany; (28) Chemical Engineering Department, Princeton University, Princeton; NJ; 08544, United States; (29) Amherst Center for Fundamental Interactions, Physics Department, University of Massachusetts, Amherst; MA; 01003, United States^9

[效力级别] 天文学 [学科分类] 天文学(综合)

[关键词] Energy productions;Geo-neutrinos;Geophysical properties;Information concerning;Neutrino fluxes;Neutrino physics;Real time measurements;Solar neutrino