Seasonal modulation of the 7 Be solar neutrino rate in Borexino

Agostini, M.; Altenmüller, K.; Appel, S.; Atroshchenko, V.; Basilico, D.; Bellini, G.; Benziger, J.; Bick, D.; Bonfini, G.; Borodikhina, L.; Bravo, D.; Caccianiga, B.; Calaprice, F.; Caminata, A.; Caprioli, S.; Carlini, M.; Cavalcante, P.; Chepurnov, A.; Choi, K.; D’Angelo, D.; Davini, S.; Derbin, A.; Ding, Xuefeng; Noto, L. Di; Drachnev, I.; Fomenko, K.; Franco, D.; Froborg, F.; Gabriele, F.; Galbiati, C.; Ghiano, C.; Giammarchi, M.; Goeger-Neff, M.; Goretti, A.; Gromov, M.; Hagner, C.; Houdy, T.; Hungerford, E.; Ianni, Aldo; Ianni, Andrea; Jany, A.; Jeschke, D.; Kobychev, V.; Korablëv, D.; Korga, G.; Kryn, D.; Laubenstein, M.; Lehnert, B.; Litvinovich, E.; Lombardi, F.; Lombardi, P.; Ludhová, L.; Lukyanchenko, G.; Machulin, I.; Manecki, S.; Manuzio, G.; Marcocci, S.; Martýn, J.; Meroni, E.; Meyer, M.; Miramonti, L.; Misiaszek, M.; Montuschi, M.; Muratova, V.; Neumair, B.; Oberauer, L.; Opitz, B.; Ortica, F.; Pallavicini, M.; Papp, L.; Pocar, A.; Ranucci, G.; Razeto, A.; Re, A.; Romani, A.; Roncin, R.; Rossi, N.; Schönert, S.; Semenov, D.; Shakina, P.; Skorokhvatov, M.; Smirnov, O.; Sotnikov, A.; Stokes, L. F. F.; Suvorov, Y.; Tartaglia, R.; Testera, G.; Thurn, J.; Toropova, M.; Unzhakov, E.; Vishneva, A.; Vogelaar, R. B.; Feilitzsch, F. von; Wang, H.; Weinz, S.; Wójcik, Marcin; Wurm, M.; Yokley, Z.; Zaimidoroga, O.; Zavatarelli, S.; Zuber, Κ.; Zuzel, G.

doi:10.1016/j.astropartphys.2017.04.004

Cited by 28 publications

(25 citation statements)

References 27 publications

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“…In order to properly reproduce the spatial dependence of the energy response, events are simulated in the detector following their expected spatial distribution: while the ν and most of background events are expected to be uniformly distributed in the detector, 210 Po decays are simulated according to their actual spatial and time distribution obtained from experimental data. Note that data events due to the α decay of 210 Po are efficiently identified by tagging 210 Po with a pulse-shape discrimination method based on the multilayer perceptron (MLP) algorithm [23] (a particular class of neural network algorithms). Similarly, γs from external background are generated on the SSS and PMTs surfaces so that the radial distribution of the interactions inside the scintillator volume shows a clear decrease from the outer region of the detector toward the center.…”

Section: A the Monte Carlo Methodsmentioning

confidence: 99%

Simultaneous precision spectroscopy of pp , Be7 , and p
Agostini¹,
Altenmüller²,
Appel³
et al. 2019
Phys. Rev. D
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We present the simultaneous measurement of the interaction rates R pp , R Be , R pep of pp, 7 Be, and pep solar neutrinos performed with a global fit to the Borexino data in an extended energy range (0.19-2.93) MeV with particular attention to details of the analysis methods. This result was obtained by analyzing 1291.51 days of Borexino Phase-II data, collected after an extensive scintillator purification campaign. Using counts per day ðcpdÞ=100 ton as unit, we find R pp ¼ 134 AE 10ðstatÞ þ6 −10 ðsysÞ, R Be ¼ 48.3 AE 1.1ðstatÞ þ0.4 −0.7 ðsysÞ; and R HZ pep ¼ 2.43 AE 0.36ðstatÞ þ0.15 −0.22 ðsysÞ assuming the interaction rate R CNO of CNO-cycle (Carbon, Nitrogen, Oxigen) solar neutrinos according to the prediction of the high metallicity standard solar model, and R LZ pep ¼ 2.65 AE 0.36ðstatÞ þ0.15 −0.24 ðsysÞ according to that of the low metallicity model. An upper limit R CNO < 8.1 cpd=100 ton (95% C.L.) is obtained by setting in the fit a constraint on the ratio R pp =R pep (47.7 AE 0.8 cpd=100 ton or 47.5 AE 0.8 cpd=100 ton according to the high or low metallicity hypothesis).

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Section: A the Monte Carlo Methodsmentioning

confidence: 99%

Simultaneous precision spectroscopy of pp , Be7 , and p
Agostini¹,
Altenmüller²,
Appel³
et al. 2019
Phys. Rev. D
Self Cite
147
4
188
0
View full text Add to dashboard Cite

show abstract

“…The multilayer perceptron (MLP) is a nonlinear technique developed using deep learning for supervising binary classifiers, i.e., functions that can decide whether an input (represented by a vector of numbers) belongs to one class or another. In Borexino this technique was applied for α=β discrimination [83], and uses several pulseshape variables, parametrizing the event hit-time profile, as input. Among these variables are, for example, tail-tototal ratio for different time bins t n , mean time of the hits in the cluster, their variance, skewness, kurtosis, and so on.…”

Section: Multilayer Perceptronmentioning

confidence: 99%

Comprehensive geoneutrino analysis with Borexino

Agostini¹,

Altenmüller²,

Appel³

et al. 2020

Phys. Rev. D

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104

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This paper presents a comprehensive geoneutrino measurement using the Borexino detector, located at Laboratori Nazionali del Gran Sasso (LNGS) in Italy. The analysis is the result of 3262.74 days of data between December 2007 and April 2019. The paper describes improved analysis techniques and optimized data selection, which includes enlarged fiducial volume and sophisticated cosmogenic veto. The reported exposure of ð1.29 AE 0.05Þ × 10 32 protons × year represents an increase by a factor of two over a previous Borexino analysis reported in 2015. By observing 52.6 þ9.4 −8.6 ðstatÞ þ2.7 −2.1 ðsysÞ geoneutrinos (68% interval) from 238 U and 232 Th, a geoneutrino signal of 47.0 þ8.4 −7.7 ðstatÞ þ2.4 −1.9 ðsysÞ TNU with þ18.3 −17.2 % total precision was obtained. This result assumes the same Th/U mass ratio as found in chondritic CI meteorites but compatible results were found when contributions from 238 U and 232 Th were both fit as free parameters. Antineutrino background from reactors is fit unconstrained and found compatible with the expectations. The null-hypothesis of observing a geoneutrino signal from the mantle is excluded at a 99.0% C.L. when exploiting detailed knowledge of the local crust near the experimental site. Measured mantle signal of 21.2 þ9.5 −9.0 ðstatÞ þ1.1 −0.9 ðsysÞ TNU corresponds to the production of a radiogenic heat of 24.6 þ11.1 −10.4 TW (68% interval) from 238 U and 232 Th in the mantle. Assuming 18% contribution of 40 K in the mantle and 8.1 þ1.9 −1.4 TW of total radiogenic heat of the lithosphere, the Borexino estimate of the total radiogenic heat of the Earth is 38.2 þ13.6 −12.7 TW, which corresponds to the convective Urey ratio of 0.78 þ0.41 −0.28. These values are compatible with different geological predictions, however there is a ∼2.4σ tension with those Earth models which predict the lowest concentration of heat-producing elements in the mantle. In addition, by constraining the number of expected reactor antineutrino events, the existence of a hypothetical georeactor at the center of the Earth having power greater than 2.4 TW is excluded at 95% C.L. Particular attention is given to the description of all analysis details which should be of interest for the next generation of geoneutrino measurements using liquid scintillator detectors.

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“…• evidence that the 7 Be neutrino interaction rate displayed a seasonal modulation consistent with the varying solid angle between the earth and the sun [5];…”

Section: 4mentioning

confidence: 96%

Solar neutrino physics with Borexino

Pocar

Agostini

Altenmüller

et al. 2019

SciPost Phys. Proc.

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We present the most recent solar neutrino results from the Borexino experiment at the Gran Sasso underground laboratory. In particular, refined measurements of all neutrinos produced in the pp fusion chain have been made. It is the first time that the same detector measures the entire range of solar neutrinos at once. These new data weakly favor a high-metallicity Sun. Prospects for measuring CNO solar neutrinos are also discussed.

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Seasonal modulation of the 7 Be solar neutrino rate in Borexino

Cited by 28 publications

References 27 publications

Simultaneous precision spectroscopy of pp , Be7 , and p
Agostini¹,
Altenmüller²,
Appel³
et al. 2019
Phys. Rev. D
Self Cite
147
4
188
0
View full text Add to dashboard Cite

Simultaneous precision spectroscopy of pp , Be7 , and p
Agostini¹,
Altenmüller²,
Appel³
et al. 2019
Phys. Rev. D
Self Cite
147
4
188
0
View full text Add to dashboard Cite

Comprehensive geoneutrino analysis with Borexino

Solar neutrino physics with Borexino

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Seasonal modulation of the 7 Be solar neutrino rate in Borexino

Cited by 28 publications

References 27 publications

Simultaneous precision spectroscopy of pp , Be7 , and pAgostini1, Altenmüller2, Appel3 et al. 2019Phys. Rev. DSelf Cite14741880View full textAdd to dashboardCite

Simultaneous precision spectroscopy of pp , Be7 , and pAgostini1, Altenmüller2, Appel3 et al. 2019Phys. Rev. DSelf Cite14741880View full textAdd to dashboardCite

Comprehensive geoneutrino analysis with Borexino

Solar neutrino physics with Borexino

Contact Info

Product

Resources

About

Simultaneous precision spectroscopy of pp , Be7 , and p
Agostini¹,
Altenmüller²,
Appel³
et al. 2019
Phys. Rev. D
Self Cite
147
4
188
0
View full text Add to dashboard Cite

Simultaneous precision spectroscopy of pp , Be7 , and p
Agostini¹,
Altenmüller²,
Appel³
et al. 2019
Phys. Rev. D
Self Cite
147
4
188
0
View full text Add to dashboard Cite