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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Astroparticle Physics 1

HK 33.2: Gruppenbericht

Dienstag, 24. März 2015, 17:30–18:00, P/H2

Latest results from the Borexino experiment and future CNO-cycle analysis — •Jan Thurn¹ and the Borexino collaboration^2,3 — ¹Technische Universität Dresden — ²INFN, Italy — ³Laboratori Nazionali del Gran Sasso, Assergi, Italy

The sun is producing energy through a sequence of nuclear processes. The majority of the energy comes from the so called pp-chain where protons are merged into helium. Neutrinos named by their originating reactions are produced in several steps of this sequence. Besides the pp-chain, the CNO-cycle is considered responsible of ~1% of the total energy produced in the Sun. According to the standard astrophysics this cycle should be dominant in heavy stars. It is still unclear whether this cycle is present in our sun and how large is its contribution is, especially related to the so called 'metalliticity' problem. Differently from photons that travel about 100 000 years from the core of the sun to outside being scattered all the way, neutrinos (thanks to their weakly interacting nature) are giving a clearer signal for studying these reactions. The Borexino experiment, a low background sub-MeV neutrinos detector - by measuring the pp, pep, 7Be and 8B neutrino spectra and giving the only current limit on the CNO-neutrino flux - is one of the leading experiments in the solar neutrino physics. In this talk the latest results are presented, together with a roadmap for the next steps of solar neutrino analysis concerning the improvement of the CNO-cycle detection techniques