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20 April 2024

» arxiv » 1909.2257

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Comprehensive geoneutrino analysis with Borexino
M. Agostini ; K. Altenmüller ; S. Appel ; V. Atroshchenko ; Z. Bagdasarian ; D. Basilico ; G. Bellini ; J. Benziger ; D. Bick ; G. Bonfini ; D. Bravo ; B. Caccianiga ; F. Calaprice ; A. Caminata ; L. Cappelli ; P. Cavalcante ; F. Cavanna ; A. Chepurnov ; K. Choi ; D. D'Angelo ; S. Davini ; A. Derbin ; A. Di Giacinto ; V. Di Marcello ; X.F. Ding ; A. Di Ludovico ; L. Di Noto ; I. Drachnev ; G. Fiorentini ; A. Formozov ; D. Franco ; F. Gabriele ; C. Galbiati ; M. Gschwender ; C. Ghiano ; M. Giammarchi ; A. Goretti ; M. Gromov ; D. Guffanti ; C. Hagner ; E. Hungerford ; Aldo Ianni ; Andrea Ianni ; A. Jany ; D. Jeschke ; S. Kumaran ; V. Kobychev ; G. Korga ; T. Lachenmaier ; T. Lasserre ; M. Laubenstein ; E. Litvinovich ; P. Lombardi ; I. Lomskaya ; L. Ludhova ; G. Lukyanchenko ; L. Lukyanchenko ; I. Machulin ; F. Mantovani ; G. Manuzio ; S. Marcocci ; J. Maricic ; J. Martyn ; E. Meroni ; M. Meyer ; L. Miramonti ; M. Misiaszek ; M. Montuschi ; V. Muratova ; B. Neumair ; M. Nieslony ; L. Oberauer ; A. Onillon ; V. Orekhov ; F. Ortica ; M. Pallavicini ; L. Papp ; Ö. Penek ; L. Pietrofaccia ; N. Pilipenko ; A. Pocar ; G. Raikov ; M.T. Ranalli ; G. Ranucci ; A. Razeto ; A. Re ; M. Redchuk ; B. Ricci ; A. Romani ; N. Rossi ; S. Rottenanger ; S. Schönert ; D. Semenov ; M. Skorokhvatov ; O. Smirnov ; A. Sotnikov ; V. Strati ; Y. Suvorov ; R. Tartaglia ; G. Testera ; J. Thurn ; E. Unzhakov ; A. Vishneva ; M. Vivier ; R.B. Vogelaar ; F. von Feilitzsch ; M. Wojcik ; M. Wurm ; O. Zaimidoroga ; S. Zavatarelli ; K. Zuber ; G. Zuzel ;
Date:	5 Sep 2019
Abstract:	This paper presents a geoneutrino measurement using 3262.74 days of data taken with the Borexino detector at LNGS in Italy. By observing $52.6 ^{+9.4}_{-8.6} ({ m stat}) ^{+2.7}_{-2.1}({ m sys})$ geoneutrinos (68% interval) from $^{238}$U and $^{232}$Th, a signal of $47.0^{+8.4}_{-7.7},({ m stat)}^{+2.4}_{-1.9},({ m sys})$ TNU with $^{+18.3}_{-17.2}$% total precision was obtained. This result assumes the same Th/U mass ratio found in chondritic CI meteorites but compatible results were found when contributions from $^{238}$U and $^{232}$Th were fit as free parameters. Antineutrino background from reactors is fit unconstrained and found compatible with the expectations. The null-hypothesis of observing a signal from the mantle is excluded at a 99.0% C.L. when exploiting the knowledge of the local crust. Measured mantle signal of $21.2 ^{+9.6}_{-9.0} ({ m stat})^{+1.1}_{-0.9} ({ m sys})$ TNU corresponds to the production of a radiogenic heat of $24.6 ^{+11.1}_{-10.4}$ TW (68% interval) from $^{238}$U and $^{232}$Th in the mantle. Assuming 18% contribution of $^{40}$K in the mantle and $8.1^{+1.9}_{-1.4}$ TW of radiogenic heat of the lithosphere, the Borexino estimate of the total Earth radiogenic heat is $38.2 ^{+13.6}_{-12.7}$ TW, corresponding to a convective Urey ratio of 0.78$^{+0.41}_{-0.28}$. These values are compatible with different geological models, however there is a 2.4$sigma$ tension with those which predict the lowest concentration of heat-producing elements. By fitting the data with a constraint on the reactor antineutrino background, the existence of a hypothetical georeactor at the center of the Earth having power greater than 2.4 TW at 95% C.L. is excluded. Particular attention is given to all analysis details, which should be of interest for the next generation geoneutrino measurements.
Source:	arXiv, 1909.2257
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