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]
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. Franco
- Fonction : Auteur
- PersonId : 755376
- ORCID : 0000-0002-7790-1224
F. Gabriele
- Fonction : Auteur
- PersonId : 783167
- ORCID : 0000-0001-9888-9175
M. Pallavicini
- Fonction : Auteur
- PersonId : 755306
- ORCID : 0000-0001-7309-3023
- IdRef : 241090474
H. Simgen
- Fonction : Auteur
- PersonId : 755331
- ORCID : 0000-0003-3074-0395
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.
Origine | Fichiers produits par l'(les) auteur(s) |
---|