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T: Fachverband Teilchenphysik
T 37: Neutrino physics without accelerators IV
T 37.1: Vortrag
Dienstag, 31. März 2020, 17:00–17:15, L-2.017
210Bi - 210Po studies for the measurement of CNO solar neutrinos with Borexino — •Sindhujha Kumaran1,2, Zara Bagdasarian1, Alexandre Göttel1,2, Livia Ludhova1,2, Ömer Penek1,2, Mariia Redchuk1,2, Giulio Settanta1, and Apeksha Singhal1,2 for the Borexino collaboration — 1IKP-2, Forschungszentrum Jülich — 2III. Physikalisches Institut B, RWTH Aachen University
Borexino is a liquid scintillator detector located at the Laboratori Nazionale del Gran Sasso, Italy with the main goal to measure solar neutrinos. After the successful measurement of all the components of the pp fusion chain, the current focus of the detector is the discovery of neutrinos from the CNO-cycle. In addition to their very low expected rate, a major challenge is posed by the prerequisite to know the rate of internal 210Bi background. This is due to the degeneracy of its spectral shape with that of CNO neutrinos. 210Bi β- decays to 210Po, which then α decays to stable 206Pb. 210Po can be distinguished on an event-by-event basis through pulse shape discrimination techniques. Ideally, 210Bi should be in secular equilibrium with 210Po. Unfortunately, additional 210Po was brought from peripheral sources to the fiducial volume by the convective motions of the scintillator, triggered by seasonal temperature changes. The insulation performed in 2015 has helped to thermally stabilize the detector. This talk will present the strategies to extract the 210Bi rate in Phase 3 through the analysis of 210Po in the cleanest region of the detector.