Updated geoneutrino measurement with Borexino

Borexino collaboration

Research output: Contribution to journalConference article

Abstract

Borexino is a 280-ton liquid scintillator detector located at the Laboratori Nazionali del Gran Sasso (LNGS), Italy and is one of the two detectors that has measured geoneutrinos so far. The unprecedented radio-purity of the scintillator, the shielding with highly purified water, and the placement of the detector at a 3800 m w.e. depth have resulted in very low background levels and has made Borexino an excellent apparatus for geoneutrino measurements. The new update of the Borexino geoneutrino measurement, using the data obtained from December 2007 to April 2019, has been presented. Enhanced analysis techniques, adopted in this measurement, have been also presented (poster presentation #39 by S. Kumaran). The updated statistics and the new elaborate analysis have led to more than a factor two increase in exposure ((1.12 ± 0.05) ×1032 protons × yr) when compared to the latest Borexino result from 2015. The resulting geoneutrino signal of 47.0+8.4−7.7 (stat)+2.4−1.9 (sys) TNU has +18.3−17.2 % total precision. The geological interpretations of this measurement have been discussed. In particular, the 99% C.L. observation of the mantle signal by exploiting the relatively well-known lithospheric contribution, the estimation of the radiogenic heat, as well as the comparison of these results to the predictions based on different geological models. The upper limits on the power of a hypothetical georeactor that might be present at different locations inside the Earth have been set.

Original languageEnglish (US)
Article number012211
JournalJournal of Physics: Conference Series
Volume1468
Issue number1
DOIs
StatePublished - Mar 20 2020
Event16th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2019 - Toyama, Japan
Duration: Sep 9 2019Sep 13 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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