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 have made Borexino an excellent apparatus for geoneutrino measurements. The analysis techniques of the latest geoneutrino results with Borexino were presented using the data obtained from December 2007 to April 2019, corresponding to an exposure of (1.12 ± 0.05) × 1032 protons × yr. Enhanced analysis techniques, such as an increased fiducial volume, improved veto for cosmogenic backgrounds, extended energy and coincidence time windows, as well as a more efficient α/β particle discrimination have been adopted in this measurement. The updated statistics and these elaborate resulted in a geoneutrino signal of with total precision.

Highlights

  • Geoneutrinos are electron neutrinos and antineutrinos emitted from radioactive decays inside the Earth

  • Geoneutrino signal is expressed in Terrestrial Neutrino Units (TNU), i.e. 1 antineutrino event detected via Inverse Beta Decay (IBD) over 1 year by a detector with 100% detection efficiency containing 1032 free target protons

  • Based on the nominal powers obtained form the International Atomic Energy Agency (IAEA), the survival probability and oscillation parameters, the expected number of reactor antineutrino signal at Laboratori Nazionali del Gran Sasso (LNGS) was calculated as 84.5+−11

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Summary

Introduction

Geoneutrinos are electron neutrinos and antineutrinos emitted from radioactive decays inside the Earth. Their detection allows to assess the Earth’s heat budget, the heat emitted in the radioactive decays, since the total amount of emitted geoneutrinos scales with the total mass of heat producing elements inside the Earth. Geoneutrinos are detected through the Inverse Beta Decay (IBD) interaction in Liquid Scintillator (LS) detectors (νe +p → e+ +n). Geoneutrino signal is expressed in Terrestrial Neutrino Units (TNU), i.e. 1 antineutrino event detected via IBD over 1 year by a detector with 100% detection efficiency containing 1032 free target protons (roughly corresponds to 1 kton of LS). Borexino is a 280-ton liquid scintillator detector located at the Laboratori Nazionali del Gran Sasso, Italy and is one of the two detectors that has measured geoneutrinos so far. Muon veto 2 s or 1.6 s or 2 ms (internal μ) 2 ms (external μ) dIV PID (α/β) Multiplicity

Analysis techniques
Background
Results and Conclusions
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