Final results of Borexino Phase-I on low-energy solar neutrino spectroscopy - Archive ouverte HAL
Article Dans Une Revue Physical Review D Année : 2014

Final results of Borexino Phase-I on low-energy solar neutrino spectroscopy

G. Bellini (1) , J. Benziger (2) , D. Bick (3) , G. Bonfini (4) , D. Bravo (5) , M. Buizza Avanzini (1) , B. Caccianiga (1) , L. Cadonati (6) , F. Calaprice (2) , P. Cavalcante (4) , A. Chavarria (2) , A. Chepurnov (7) , D. D’angelo (1) , S. Davini (8) , A. Derbin (9) , A. Empl (8) , A. Etenko (10) , K. Fomenko (11) , D. Franco (12) , F. Gabriele (4) , C. Galbiati (2) , S. Gazzana (4) , C. Ghiano (12) , M. Giammarchi (1) , M. Göger-Neff (13) , A. Goretti (2) , L. Grandi (2) , M. Gromov (7) , C. Hagner (14) , E. Hungerford (8) , Aldo Ianni (4) , Andrea Ianni (2) , V. Kobychev (15) , D. Korablev (11) , G. Korga (8) , D. Kryn (12) , M. Laubenstein (4) , T. Lewke (13) , E. Litvinovich (10) , B. Loer (2) , F. Lombardi (4) , P. Lombardi (1) , L. Ludhova (1) , G. Lukyanchenko (10) , I. Machulin (10) , S. Manecki (5) , W. Maneschg (16) , G. Manuzio (17) , Q. Meindl (13) , E. Meroni (1) , L. Miramonti (1) , M. Misiaszek (18) , P. Mosteiro (2) , V. Muratova (19) , L. Oberauer (13) , M. Obolensky (12) , F. Ortica (20) , K. Otis (21) , M. Pallavicini (22) , L. Papp (5) , C. Pena-Garay (23) , L. Perasso (17) , S. Perasso (17) , A. Pocar (21) , G. Ranucci (1) , A. Razeto (4) , A. Re (1) , A. Romani (24) , N. Rossi (25) , R. Saldanha (2) , C. Salvo (4) , S. Schönert (13) , H. Simgen (16) , M. Skorokhvatov (10) , O. Smirnov (11) , A. Sotnikov (10) , S. Sukhotin (11) , Y. Suvorov (11) , R. Tartaglia (26) , G. Testera (17) , D. Vignaud (12) , R. B. Vogelaar (5) , F. von Feilitzsch (13) , J. Winter (13) , M. Wojcik (18) , A. Wright (2) , M. Wurm (14) , J. Xu (2) , O. Zaimidoroga (11) , S. Zavatarelli (17) , G. Zuzel (18)
1 INFN - Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2 DPPU - Department of Physics, Princeton University
3 UHH - Universität Hamburg
4 INFN - Istituto Nazionale di Fisica Nucleare
5 Virginia Polytechnic Institute and State University [Blacksburg]
6 Physics Department
7 MSU - Lomonosov Moscow State University = Université d'État Lomonossov de Moscou [Moscou]
8 University of Houston
9 Petersburg Nucl Phys Inst, Gatchina 188300, Russia
10 NRC KI - National Research Center "Kurchatov Institute"
11 BLTP - Bogoliubov Laboratory of Theoretical Physics [Dubna]
12 APC (UMR_7164) - AstroParticule et Cosmologie
13 TUM - Technische Universität Munchen - Technical University Munich - Université Technique de Munich
14 Institut für Experimentalphysik [Hamburg]
15 KINR - Kiev Institute for Nuclear Research
16 MPIK - Max-Planck-Institut für Kernphysik
17 INFN, Sezione di Genova - Istituto Nazionale di Fisica Nucleare, Sezione di Genova
18 UJ - Uniwersytet Jagielloński w Krakowie = Jagiellonian University
19 National Research Centre “Kurchatov Institute”: Petersburg Nuclear Physics Institute
20 Dipartimento di Chimica [Perugia]
21 UMass Amherst - University of Massachusetts [Amherst]
22 UniGe - Università degli studi di Genova = University of Genoa
23 Istituto de Fisica Corpuscular
24 INFN, Sezione di Perugia - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
25 Department of Physics and Astronomy [UCLA, Los Angeles]
26 UCLA - University of California [Los Angeles]
D. Bick
  • Fonction : Auteur
L. Cadonati
  • Fonction : Auteur
S. Davini
  • Fonction : Auteur
A. Empl
  • Fonction : Auteur
D. Franco
F. Gabriele
G. Korga
  • Fonction : Auteur
H. Simgen

Résumé

Borexino has been running since May 2007 at the LNGS laboratory in Italy with the primary goal of detecting solar neutrinos. The detector, a large, unsegmented liquid scintillator calorimeter characterized by unprecedented low levels of intrinsic radioactivity, is optimized for the study of the lower energy part of the spectrum. During the Phase-I (2007 - 2010), Borexino first detected and then precisely measured the flux of the 7Be solar neutrinos, ruled out any significant day–night asymmetry of their interaction rate, made the first direct observation of the pep neutrinos, and set the tightest upper limit on the flux of CNO solar neutrinos. In this paper we discuss the signal signature and provide a comprehensive description of the backgrounds, quantify their event rates, describe the methods for their identification, selection or subtraction, and describe data analysis. Key features are an extensive in situ calibration program using radioactive sources, the detailed modeling of the detector response, the ability to define an innermost fiducial volume with extremely low background via software cuts, and the excellent pulse–shape discrimination capability of the scintillator that allows particle identification. We report a measurement of the annual modulation of the 7Be neutrino interaction rate. The period, the amplitude, and the phase of the observed modulation are consistent with the solar origin of these events, and the absence of their annual modulation is rejected with higher than 99% C.L. The physics implications of Phase-I results in the context of the neutrino oscillation physics and solar models are presented.
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Dates et versions

hal-02553229 , version 1 (21-01-2022)

Identifiants

Citer

G. Bellini, J. Benziger, D. Bick, G. Bonfini, D. Bravo, et al.. Final results of Borexino Phase-I on low-energy solar neutrino spectroscopy. Physical Review D, 2014, 89 (11), ⟨10.1103/PhysRevD.89.112007⟩. ⟨hal-02553229⟩
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