SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 139: Neutrinos VI

T 139.4: Vortrag

Donnerstag, 23. März 2023, 18:15–18:30, POT/0051

Directionality measurement of CNO neutrinos in the Borexino detector — •Johann Martyn¹ and Apeksha Singhal^{2, 3} — ¹Johannes Gutenberg - Universtät Mainz — ²Forschungszentrum Jülich GmbH, Nuclear Physics Institute IKP-2 — ³III. Physikalisches Institut B, RWTH Aachen

Borexino has been a 280 t liquid scintillator detector situated at the INFN Laboratori Nazionali del Gran Sasso in Italy. With an unprecedetened level of radiopurity and a 3800 m.w.e. of rock shielding its main goal is the measurement of solar neutrinos. Previously the Borexino collaboration has provided the first directional measurment of sub-MeV ⁷Be neutrinos using the so called "Correlated and Integrated Directionality" (CID). Here the known position of the Sun is correlated to the reconstructed photon direction, given by the hit PMT position and the reconstructed event position. Cherenkov hits from the neutrino recoil electrons show a correlation to the position of the Sun, while the isotropic scintillation and background events are not. The integrated angular distribution of the hits for a large number of events then allows for the statistical inference on the number of neutrino events. This talk presents the CID measurement of CNO neutrinos, using the full Borexino detector live time from May 2007 to October 2021.