The liquid handling systems for the Borexino solar neutrino detector

Alimonti, G.; Arpesella, C.; Avanzini, M. Buizza; Back, H. O.; Balata, M.; Bartolomei, D.; Bellefon, A. de; Bellini, G.; Benziger, J.; Bévilacqua, A.; Bondi, D.; Bonetti, S.; Brigatti, A.; Caccianiga, B.; Cadonati, L.; Calaprice, F.; Carraro, C.; Cecchet, G.; Cereseto, R.; Chavarría, Á.; Chen, M.; Chepurnov, A.; Cubaiu, A.; Czech, W.; D’Angelo, D.; Dalnoki‐Veress, F.; Davini, S.; Bari, A. de; Haas, E. de; Derbin, A.; Deutsch, Martin; Credico, A. Di; Lüdovico, A. Di; Pietro, G. Di; Eisenstein, R. A.; Elisei, Fausto; Etenko, A.; Feilitzsch, F. von; Fernholz, Robert; Fomenko, K.; Ford, R.; Franco, D.; Freudiger, B.; Gaertner, N.; Galbiati, C.; Gatti, F.; Gazzana, S.; Gehman, V. M.; Giammarchi, M.; Giugni, D.; Goeger-Neff, M.; Goldbrunner, T.; Golubchikov, A.; Goretti, A.; Grieb, C.; Guardincerri, E.; Hagner, C.; Hagner, T.; Hampel, W.; Harding, Eric; Hardy, S.; Hartmann, F.; Hentig, R. von; Hertrich, T.; Heusser, G.; Hult, M.; Ianni, Aldo; Ianni, An.; Ioannucci, L.; Jaenner, K.; Joyce, M.; Kerret, H. de; Kidner, S.; Kiko, J.; Kirsten, T.; Kobychev, V.; Korga, G.; Korschinek, G.; Kozlov, Yu. V.; Kryn, D.; Marche, P. La; Lagomarsino, V.; Laubenstein, M.; Lendvai, C.; Leung, M.; Lewke, T.; Litvinovich, E.; Loer, B.; Loeser, F.; Lombardi, P.; Ludhová, L.; Machulin, I.; Malvezzi, S.; Manco, A.; Maneira, J.; Maneschg, W.; Manno, I.; Manuzio, D.; Manuzio, G.; Marchelli, M.; Marternianov, A.; Masetti, F.; Mazzucato, U.; McCarty, K.; McKinsey, D. N.; Meindl, Q.; Meroni, E.; Miramonti, L.; Misiaszek, M.; Montanari, D.; Monzani, M. E.; Muratova, V.; Musico, P.; Neder, H.; Nelson, A.; Niedermeier, L.; Nisi, S.; Oberauer, L.; Obolensky, M.; Orsini, M.; Ortica, F.; Pallavicini, M.; Papp, L.; Parsells, R.; Parmeggiano, S.; Parodi, Mauro; Pelliccia, N.; Perasso, L.; Perasso, S.; Pocar, A.; Raghavan, R. S.; Ranucci, G.; Rau, W.; Razeto, A.; Resconi, E.; Risso, P.; Romani, A.; Rountree, D.; Sabelnikov, A.; Saggese, Paolo; Saldanha, R.; Salvo, C.; Scardaoni, R.; Schimizzi, D.; Schönert, S.; Schubeck, K. H.; Shutt, T.; Siccardi, F.; Simgen, H.; Skorokhvatov, M.; Smirnov, O.; Sonnenschein, A.; Soricelli, F.; Sotnikov, A.; Sukhotin, S.; Sule, C.; Suvorov, Y.; Tarasenkov, V. G.; Tartaglia, R.; Testera, G.; Vignaud, D.; Vitale, S.; Vogelaar, R. B.; Vyrodov, V.; Williams, Brian P.; Wójcik, Marcin; Wordel, R.; Wurm, M.; Zaimidoroga, O.; Zavatarelli, S.; Zuzel, G.

doi:10.1016/j.nima.2009.07.028

Cited by 81 publications

(58 citation statements)

References 18 publications

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“…The large mixing angle solution (LMA) of the MSW effect [10] predicts a transition in the ν e survival probability from the vacuum oscillation regime at low energies to the matter dominated regime at high energies. Results on solar 7 Be and 8 B neutrinos from Borexino, combined with prediction on the absolute neutrino fluxes from the Standard Solar Model [11][12][13], confirm that our data are in agreement with the MSW-LMA prediction within 1σ.…”

Section: Solarsupporting

confidence: 84%

“…Distortions of the energy scale are due to physical effects (quenching), geometrical effects (light collection), and to the electronics, which was designed for optimal performance in the low-energy range of 7 Be neutrinos, in a regime where a single photoelectron is expected for each PMT. At higher energies, the electronics response to multiple photoelectron hits on a single channel is not linear.…”

Section: Energy Scalementioning

confidence: 99%

“…Future precision measurements of 7 Be and 8 B (and, possibly, pep) neutrinos in Borexino could provide an even more stringent test of the difference in P ee for low-and highenergy neutrinos predicted by the MSW-LMA theory: assuming other 4 years of data taking, and to reduce the overall uncertainty on 7 Be neutrino rate at 5%, the distance between the two survival probabilities can be improved at 3 σ.…”

Section: Neutrino Interaction Rates and Electron Scattering Spectrummentioning

confidence: 99%

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Measurement of the solarB8neutrino rate with a liquid scintillator target and 3 MeV energy threshold in the Borexino detector

Bellini¹,

Benziger²,

Bonetti³

et al. 2010

Phys. Rev. D

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269

184

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We report the measurement of ν-e elastic scattering from 8 B solar neutrinos with 3 MeV energy threshold by the Borexino detector in Gran Sasso (Italy). The rate of solar neutrino-induced electron scattering events above this energy in Borexino is 0.217 ± 0.038(stat) ± 0.008(syst) cpd/100 t, which corresponds to Φ ES 8 B = 2.4 ± 0.4± 0.1×10 6 cm −2 s −1 , in good agreement with measurements from SNO and SuperKamiokaNDE. Assuming the 8 B neutrino flux predicted by the high metallicity Standard Solar Model, the average 8 B νe survival probability above 3 MeV is measured to be 0.29±0.10. The survival probabilities for 7 Be and 8 B neutrinos as measured by Borexino differ by 1.9 σ. These results are consistent with the prediction of the MSW-LMA solution of a transition in the solar νe survival probability Pee between the low energy vacuum-driven and the high-energy matter-enhanced solar neutrino oscillation regimes.PACS numbers: 14.60. St, 26.65.+t, 95.55.Vj, 29.40.Mc INTRODUCTION Solar8 B-neutrino spectroscopy has been so far performed by the waterČerenkov detectors KamiokaNDE, SuperKamiokaNDE,. The first two experiments used elastic ν-e scattering for the detection of neutrinos, whereas SNO also exploited nuclear reaction channels on deuterium with heavy water as target. These experiments provided robust spectral measurements with ∼5 MeV threshold or higher for scattered electrons; a recent SNO analysis reached a 3.5 MeV threshold [5].We report the first observation of solar 8 B-neutrinos with a liquid scintillator detector, performed by the Borexino experiment [6,7] via elastic ν-e scattering. Borexino is the first experiment to succeed in suppressing all major backgrounds, above the 2.614 MeV γ from the decay of 208 Tl, to a rate below that of electron scatterings from solar neutrinos. This allows to reduce the energy threshold for scattered electrons by 8 B solar neutrinos to 3 MeV, the lowest ever reported for the electron scattering channel. To facilitate a comparison to the results of SuperKamiokaNDE [3] and SNO D 2 O phase [4], we also report the measured 8 B neutrino interaction rate with 5 MeV threshold.Since Borexino also detected low energy solar 7 Be neutri-2 nos [8,9], this is the first experiment where both branches of the solar pp-cycle have been measured simultaneously in the same target. The large mixing angle solution (LMA) of the MSW effect [10] predicts a transition in the ν e survival probability from the vacuum oscillation regime at low energies to the matter dominated regime at high energies. Results on solar 7 Be and 8 B neutrinos from Borexino, combined with prediction on the absolute neutrino fluxes from the Standard Solar Model [11][12][13], confirm that our data are in agreement with the MSW-LMA prediction within 1σ. EXPERIMENTAL APPARATUS AND ENERGY THRESHOLDThe Borexino detector is located at the underground Laboratori Nazionali del Gran Sasso (LNGS) in central Italy, at a depth of 3600 m.w.e.. Solar neutrinos are detected in Borexino exclusively via elastic ν-e scattering in a li...

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Section: Solarsupporting

confidence: 84%

Section: Energy Scalementioning

confidence: 99%

Section: Neutrino Interaction Rates and Electron Scattering Spectrummentioning

confidence: 99%

See 1 more Smart Citation

Measurement of the solarB8neutrino rate with a liquid scintillator target and 3 MeV energy threshold in the Borexino detector

Bellini¹,

Benziger²,

Bonetti³

et al. 2010

Phys. Rev. D

Self Cite

269

184

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“…The distillation and nitrogen stripping facilities were developed based on the experience gained with the similar facilities in Borexino [18,19]. Figure 6 is a block diagram of the fluid handling plants.…”

Section: Fluid Handling System and Scintillator Purificationmentioning

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

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184

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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“…The unmatched radio purity of the liquid scintillator [a mixture of 1,2,4-trimethylbenzene (PC) and 2,5-diphenyloxazole (PPO) [8]] was obtained by means of a very careful selection and cleaning of materials, the development of innovative purification techniques [9,10], and the extreme care taken during procurement and handling of the scintillator fluid and the filling of the detector. In addition, the successful measurement of several solar neutrino components with Borexino ( 7 Be [11,12], 8 B [13], pep [14], and pp [15]) demonstrates an unprecedented sensitivity which can be applied to the search for a two-body e → ν e þ γ decay resulting in the emission of a 256 keV photon.…”

mentioning

confidence: 99%

Test of Electric Charge Conservation with Borexino

Agostini¹,

Appel²,

Bellini³

et al. 2015

Phys. Rev. Lett.

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Borexino is a liquid scintillation detector located deep underground at the Laboratori Nazionali del Gran Sasso (LNGS, Italy). Thanks to the unmatched radio purity of the scintillator, and to the well understood detector response at low energy, a new limit on the stability of the electron for decay into a neutrino and a single monoenergetic photon was obtained. This new bound, τ ≥ 6.6 × 10 28 yr at 90% C.L., is 2 orders of magnitude better than the previous limit.

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The liquid handling systems for the Borexino solar neutrino detector

Cited by 81 publications

References 18 publications

Measurement of the solarB8neutrino rate with a liquid scintillator target and 3 MeV energy threshold in the Borexino detector

Measurement of the solarB8neutrino rate with a liquid scintillator target and 3 MeV energy threshold in the Borexino detector

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

Test of Electric Charge Conservation with Borexino

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