Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 55: Neutrinophysik III

T 55.5: Vortrag

Mittwoch, 27. März 2019, 17:15–17:30, H05

Updated Geoneutrino Measurement with the Borexino Detector — •Sindhujha Kumaran1,2, Zara Bagdasarian1, Sale-Iti Kroon1,2, Livia Ludhova1,2, Ömer Penek1,2, and Mariia Redchuk1,2 for the Borexino collaboration — 1IKP-2, Forschungszentrum Jülich — 2III B Physikalisches Institut, RWTH Aachen University

Geoneutrinos are electron antineutrinos and neutrinos emitted in the radioactive decays of heat producing elements such as 238U, 235U, 232Th and 40K from the Earth’s interior. The main goal of neutrino geophysics is to use the obtained geoneutrino signals in estimating the abundance and distribution of these elements. So far, only two detectors, namely KamLAND and Borexino, have measured geoneutrinos.

The Borexino Detector is a liquid scintillator detector located at the Laboratori Nazionali del Gran Sasso (LNGS). The latest geoneutrino measurement included a 5.9σ evidence of geoneutrinos and the rejection of the null hypothesis of the mantle signal at a 98% C.L. The uncertainty in the latest published result is 26.2%. This work concentrates on the further improvement of the geoneutrino measurement. The increased statistics and the optimised selection cuts used for the analysis have made it possible to reduce the uncertainty to 20.6%. An uncertainty of less than 20% can be achieved by the further optimisation of the selection cuts and needs more investigation.

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