Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 80: Neutrinophysik IV

T 80.4: Talk

Thursday, March 28, 2019, 16:50–17:05, S06

Inner vessel shape reconstruction methods of the Borexino experiment — •Vsevolod Orekhov, Johann Martyn, Michael Nieslony, and Michael Wurm for the Borexino collaboration — Institute of Physics, JGU Mainz

Borexino is a large liquid-scintillator experiment located deep underground at the Laboratori Nazionali del Gran Sasso in Italy. The unprecedented levels of radio-purity achieved in Borexino enable the experiment to perform solar neutrino spectroscopy with an energy threshold of ∼0.2 MeV. Borexino has been able to measure all spectral components associated with the solar pp-chain. The active core of the detector consists of about 300 t of pseudocumene doped with 1.5 g per litre of PPO and contained in a spherical nylon inner vessel (R = 4.25m). It is very crucial to know the exact vessel shape of the detector in order to estimate the systematic error of the exposure, check position reconstruction tools for events inside the fiducial volume and perform Monte Carlo simulations. Methods based on ²¹⁰Bi and ¹⁴C events are perfectly matched and are in a very good comparison with the vessel shape obtained after photographing it with CCD cameras. Both of them are presented in this talk.

Borexino is supported by funds of the Deutsche Forschungsgemeinschaft (DFG).