Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 94: Neutrino physics without accelerators VII
T 94.1: Gruppenbericht
Donnerstag, 18. März 2021, 16:00–16:20, Ts
Measurement of pp chain and CNO cycle solar neutrinos with Borexino — •Ömer Penek1,2, Alexandre Goettel1,2, Sindhujha Kumaran1,2, Livia Ludhova1,2, Luca Pelicci1,2, Giulio Settanta1, and Apeksha Singhal1,2 for the Borexino collaboration — 1Forschungszentrum Jülich - Institute for Nuclear Physics, IKP-2, Jülich, Germany — 2RWTH Aachen University - Physics Institute III B, Aachen, Germany
The Borexino detector, located at the Laboratori Nazionali del Gran Sasso in Italy, is a liquid scintillator detector with a primary goal to measure solar neutrinos. The pp fusion chain has been measured in Borexino with an outstanding precision through the detection of pp, pep, 7Be, and 8B neutrinos in Borexino Phase-II, namely the data-taking period from December 2011 until May 2016. The observation of neutrinos from the CNO cycle has been achieved recently by the Borexino collaboration for the first time since its prediction in the 1930s by Bethe and Weizsäcker. This measurement is challenging due to the high correlation with the 210Bi isotope and the pep neutrino signal present in the liquid scintillator. In the so-called Borexino Phase-III, namely the data-taking period from July 2016 until February 2020, the upper limit on the 210Bi rate has been determined through the tagging of alphas from 210Po, which is the decay product of 210Bi. This talk is dedicated to the Borexino solar neutrino analysis with a focus on the observation of CNO neutrinos.