Muon and cosmogenic neutron detection in Borexino

被引：77

作者：

Bellini, G. ^{[1
,2
]}

Benziger, J. ^{[7
]}

Bick, D. ^{[20
]}

Bonetti, S. ^{[1
,2
]}

Avanzini, M. Buizza ^{[1
,2
]}

Caccianiga, B. ^{[1
,2
]}

Cadonati, L. ^{[19
]}

Calaprice, F. ^{[5
]}

Carraro, C. ^{[8
,9
]}

Chavarria, A. ^{[5
]}

Chepurnov, A. ^{[21
]}

D'Angelo, D. ^{[1
,2
]}

Davini, S. ^{[8
,9
]}

Derbin, A. ^{[11
]}

Etenko, A. ^{[12
]}

von Feilitzsch, F. ^{[10
]}

Fomenko, K. ^{[13
]}

Franco, D. ^{[6
]}

Galbiati, C. ^{[5
]}

Gazzana, S. ^{[3
]}

Ghiano, C. ^{[3
]}

Giammarchi, M. ^{[1
,2
]}

Goeger-Neff, M. ^{[10
]}

Goretti, A. ^{[5
]}

Guardincerri, E. ^{[8
,9
]}

Hardy, S. ^{[4
]}

Ianni, Aldo ^{[3
]}

Ianni, Andrea ^{[5
]}

Joyce, M. ^{[4
]}

Kobychev, V. ^{[22
]}

Koshio, Y. ^{[3
]}

Korablev, D. ^{[13
]}

Korga, G. ^{[3
,15
]}

Kryn, D. ^{[6
]}

Laubenstein, M. ^{[3
]}

Lendvai, C. ^{[10
]}

Lewke, T. ^{[10
]}

Litvinovich, E. ^{[12
]}

Loer, B. ^{[5
]}

Lombardi, F. ^{[3
]}

Lombardi, P. ^{[1
,2
]}

Ludhova, L. ^{[1
,2
]}

Machulin, I. ^{[12
]}

Manecki, S. ^{[4
]}

Maneschg, W. ^{[14
]}

Manuzio, G. ^{[8
,9
]}

Meindl, Q. ^{[10
]}

Meroni, E. ^{[1
,2
]}

Miramonti, L. ^{[1
,2
]}

Misiaszek, M. ^{[16
]}

机构：

[1] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

[2] INFN Milano, I-20133 Milan, Italy

[3] Lab Nazl Gran Sasso, I-67010 Assergi, AQ, Italy

[4] Virginia Polytech Inst & State Univ, Dept Phys, Blacksburg, VA 24061 USA

[5] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

[6] Astroparticule & Cosmol APC, F-75205 Paris 13, France

[7] Princeton Univ, Dept Chem Engn, Princeton, NJ 08544 USA

[8] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy

[9] INFN Genova, I-16146 Genoa, Italy

[10] Tech Univ Munich, D-85747 Garching, Germany

[11] St Petersburg Nucl Phys Inst, Gatchina, Russia

[12] RRC Kurchatov Inst, Moscow 123182, Russia

[13] Joint Inst Nucl Res Dubna, Dubna 141980, Russia

[14] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany

[15] KFKI RMKI, H-1121 Budapest, Hungary

[16] Jagiellonian Univ, Inst Phys, PL-30059 Krakow, Poland

[17] Univ Perugia, Dipartimento Chim, I-06123 Perugia, Italy

[18] INFN Perugia, I-06123 Perugia, Italy

[19] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA

[20] Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany

[21] Moscow MV Lomonosov State Univ, Inst Nucl Phys, Moscow 119899, Russia

[22] Inst Nucl Res, UA-03680 Kiev, Ukraine

来源：

JOURNAL OF INSTRUMENTATION | 2011年 / 6卷

基金：

美国国家科学基金会;

关键词：

Particle identification methods; Particle tracking detectors; Cherenkov detectors; Large detector systems for particle and astroparticle physics; PULSE-SHAPE DISCRIMINATION; GRAN-SASSO; FACILITY; LNGS;

D O I：

10.1088/1748-0221/6/05/P05005

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Borexino, a liquid scintillator detector at LNGS, is designed for the detection of neutrinos and antineutrinos from the Sun, supernovae, nuclear reactors, and the Earth. The feeble nature of these signals requires a strong suppression of backgrounds below a few MeV. Very low intrinsic radiogenic contamination of all detector components needs to be accompanied by the efficient identification of muons and of muon-induced backgrounds. Muons produce unstable nuclei by spallation processes along their trajectory through the detector whose decays can mimic the expected signals; for isotopes with half-lives longer than a few seconds, the dead time induced by a muon-related veto becomes unacceptably long, unless its application can be restricted to a sub-volume along the muon track. Consequently, not only the identification of muons with very high efficiency but also a precise reconstruction of their tracks is of primary importance for the physics program of the experiment. The Borexino inner detector is surrounded by an outer water-Cherenkov detector that plays a fundamental role in accomplishing this task. The detector design principles and their implementation are described. The strategies adopted to identify muons are reviewed and their efficiency is evaluated. The overall muon veto efficiency is found to be 99.992% or better. Ad-hoc track reconstruction algorithms developed are presented. Their performance is tested against muon events of known direction such as those from the CNGS neutrino beam, test tracks available from a dedicated External Muon Tracker and cosmic muons whose angular distribution reflects the local overburden profile. The achieved angular resolution is similar to 3 degrees-5 degrees and the lateral resolution is similar to 35-50 cm, depending on the impact parameter of the crossing muon. The methods implemented to efficiently tag cosmogenic neutrons are also presented.

引用

页数：40

共 26 条

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