Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 55: Neutrinophysik III

T 55.3: Gruppenbericht

Mittwoch, 27. März 2019, 16:40–17:00, H05

Borexino's guide into the solar core and neutrinos — •Zara Bagdasarian¹, Sale-Iti Kroon^{1, 2}, Sindhujha Kumaran^{1, 2}, Livia Ludhova^{1, 2}, Ömer Penek^{1, 2}, and Mariia Redchuk^{1, 2} for the Borexino collaboration — ¹IKP-2, Forschungszentrum Jülich — ²III Physikalisches Institut, RWTH Aachen University

The Borexino experiment is located at the Laboratori Nazionali del Gran Sasso in Italy with the primary goal of detecting solar neutrinos, particularly those below 2 MeV, with unprecedentedly high sensitivity. The Borexino collaboration has recently published the comprehensive measurement of solar neutrinos produced along the pp-chain, a sequence of nuclear reactions responsible for about 99 percent of solar energy. The solar neutrinos produced in different fusion reactions are affected to a different extent (due to their different energies) by the so-called Mikheyev, Smirnov, and Wolfenstein effect. As neutrinos propagate from the core of Sun to the photosphere, the oscillation parameters acquire effective values in an energy-dependent fashion. As a result, by measuring the solar neutrinos at different energies, Borexino probes the neutrino flavor-transition phenomena simultaneously both in a vacuum and matter-dominated regimes. The neutrino fluxes also provide a direct determination of the relative intensity of the two primary terminations of the pp-chain (pp-I and pp-II) and an indication that the temperature profile in the Sun is more compatible with solar models that assume high surface metallicity. In short, we explore the solar neutrinos measurements in Borexino as a unique probe of both the Sun's internal working, as well as fundamental physics.