Cosmogenic Backgrounds in Borexino at 3800 m water-equivalent depth

Bellini, G.; Benziger, J.; Bick, D.; Bonfini, G.; Bravo, D.; Avanzini, M. Buizza; Caccianiga, B.; Cadonati, L.; Calaprice, F.; Cavalcante, P.; Chavarría, Á.; Chepurnov, A.; D’Angelo, D.; Davini, S.; Derbin, A.; Empl, A.; Etenko, A.; Fomenko, K.; Franco, D.; Galbiati, C.; Gazzana, S.; Ghiano, C.; Giammarchi, M.; Göger‐Neff, M.; Goretti, A.; Grandi, L.; Hagner, C.; Hungerford, E.; Ianni, Aldo; Ianni, Andrea; Kobychev, V.; Korablëv, D.; Korga, G.; Kryn, D.; Laubenstein, M.; Lewke, T.; Litvinovich, E.; Loer, B.; Lombardi, P.; Lombardi, F.; Ludhová, L.; Lukyanchenko, G.; Machulin, I.; Manecki, S.; Maneschg, W.; Manuzio, G.; Meindl, Q.; Meroni, E.; Miramonti, L.; Misiaszek, M.; Möllenberg, R.; Mosteiro, P.; Muratova, V.; Oberauer, L.; Obolensky, M.; Ortica, F.; Otis, K.; Pallavicini, M.; Papp, L.; Perasso, L.; Perasso, S.; Pocar, A.; Ranucci, G.; Razeto, A.; Re, A.; Romani, A.; Rossi, N.; Saldanha, R.; Salvo, C.; Schönert, S.; Simgen, H.; Skorokhvatov, M.; Smirnov, O.; Sotnikov, A.; Sukhotin, S.; Suvorov, Y.; Tartaglia, R.; Testera, G.; Vignaud, D.; Vogelaar, R. B.; Feilitzsch, F. von; Winter, J.; Wójcik, Marcin; Wright, A.; Wurm, M.; Xu, J.; Zaimidoroga, O.; Zavatarelli, S.; Zuzel, G.

doi:10.1088/1475-7516/2013/08/049

Cited by 97 publications

(163 citation statements)

References 32 publications

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“…This corresponds to about 2000 muons per day crossing the WCV, about 380 muons per day crossing the LSV, and about 4 muons per day crossing the LAr TPC. Cosmogenic muons can produce high energy neutrons [8,38], which can penetrate several meters of shielding. In order to avoid backgrounds from these high energy neutrons, the WCV acts as a veto to detect the muons that may produce them and therefore leave a detectable coincident signal.…”

Section: The Water Cherenkov Vetomentioning

confidence: 99%

Results from the first use of low radioactivity argon in a dark matter search

Agnes¹,

Agostino²,

Albuquerque³

et al. 2016

Phys. Rev. D

180

239

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A b s tra c t: Nuclear recoil events produced by neutron scatters form one of the most important classes of background in WIMP direct detection experiments, as they may produce nuclear recoils that look exactly like W IMP interactions. In DarkSide-50, we both actively suppress and measure the rate of neutron-induced background events using our neutron veto, composed of a boron-loaded liquid scintillator detector within a water Cherenkov detector. This paper is devoted to the description of the neutron veto system of DarkSide-50, including the detector structure, the fundamentals of event reconstruction and data analysis, and basic performance parameters.

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Section: The Water Cherenkov Vetomentioning

confidence: 99%

Results from the first use of low radioactivity argon in a dark matter search

Agnes¹,

Agostino²,

Albuquerque³

et al. 2016

Phys. Rev. D

180

239

View full text Add to dashboard Cite

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“…The MUSIC code [26,27] is used to propagate muons from the top of the mountain to the underground halls and uses the digitized mountain profile to calculate the path length in rock. MUSIC's standard rock properties (Z ¼ 11, A ¼ 22, and ρ ¼ 2.65 g/cm 3 ) are used in the simulation. Table I shows the underground muon flux for each hall from the MUSIC simulation.…”

Section: A Muon Flux Simulationmentioning

confidence: 99%

“…The predicted yields at Daya Bay from GEANT4 and FLUKA are also shown. Experimental data is shown from Hertenberger [6], Boehm [8], Aberdeen Tunnel [10], KamLAND [4], LVD [2] with corrections from [35], and Borexino [3]. The solid line shows the power-law fit to the global data set including Daya Bay.…”

Section: A Comparison With Other Experimentsmentioning

confidence: 99%

“…Muon-induced neutron and isotope production has been studied with the CERN Super Proton Synchrotron (SPS) muon beam in 2000 [1]. Studies on neutron and isotope yields in various materials in underground detectors have been performed by the INFN largevolume detector (LVD) [2], Borexino [3], KamLAND [4], and many others [5][6][7][8][9][10][11][12]. This paper reports a measurement of the neutron production rate in liquid scintillator at three different values of average muon energy by the Daya Bay Reactor Neutrino Experiment, an underground lowbackground neutrino oscillation experiment.…”

Section: Introductionmentioning

confidence: 99%

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Cosmogenic neutron production at Daya Bay

An¹,

Balantekin²,

Band³

et al. 2018

Phys. Rev. D

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Neutrons produced by cosmic ray muons are an important background for underground experiments studying neutrino oscillations, neutrinoless double beta decay, dark matter, and other rare-event signals. A measurement of the neutron yield in the three different experimental halls of the Daya Bay Reactor Neutrino Experiment at varying depth is reported. The neutron yield in Daya Bay's liquid scintillator is measured to be Y n ¼ð10.26AE0.86Þ×10 −5 , ð10.22AE0.87Þ×10 −5 , and ð17.03AE1.22Þ×10 −5 μ −1 g −1 cm 2 at depths of 250, 265, and 860 meters-water-equivalent. These results are compared to other measurements and the simulated neutron yield in FLUKA and GEANT4. A global fit including the Daya Bay measurements yields a power law coefficient of 0.77 AE 0.03 for the dependence of the neutron yield on muon energy.

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“…These include detectors of neutrinos [1], neutrinoless double-beta decay [2], and dark matter [3,4,5,6]. Within the LUX-Zeplin (LZ) detector, radon and radon daughters can diffuse into the fiducial volume within the liquid xenon.…”

Section: Introductionmentioning

confidence: 99%

Constraining radon backgrounds in LZ

Miller

Busenitz

Edberg

et al. 2018

AIP Conference Proceedings

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Abstract. The LZ dark matter detector, like many other rare-event searches, will suffer from backgrounds due to the radioactive decay of radon daughters. In order to achieve its science goals, the concentration of radon within the xenon should not exceed 2 µBq/kg, or 20 mBq total within its 10 tonnes. The LZ collaboration is in the midst of a program to screen all significant components in contact with the xenon. The four institutions involved in this effort have begun sharing two cross-calibration sources to ensure consistent measurement results across multiple distinct devices. We present here five preliminary screening results, some mitigation strategies that will reduce the amount of radon produced by the most problematic components, and a summary of the current estimate of radon emanation throughout the detector. This best estimate totals < 17.3 mBq, sufficiently low to meet the detector's science goals.

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Cosmogenic Backgrounds in Borexino at 3800 m water-equivalent depth

Cited by 97 publications

References 32 publications

Results from the first use of low radioactivity argon in a dark matter search

Results from the first use of low radioactivity argon in a dark matter search

Cosmogenic neutron production at Daya Bay

Constraining radon backgrounds in LZ

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