Heidelberg 2022 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 11: Astroparticles: From the source to the detector (joint session EP/T)

EP 11.9: Talk

Thursday, March 24, 2022, 18:15–18:30, EP-H1

Recent solar and geoneutrino results from Borexino — •Sindhujha Kumaran for the Borexino collaboration — Forschungszentrum Jülich - Institute for Nuclear Physics, IKP-2, Jülich, Germany — III. Physikalisches Institut B, RWTH Aachen University, Aachen, Germany

Borexino is a 280-ton liquid scintillator experiment which ran from May 2007 until October 2021 at the Laboratori Nazionali del Gran Sasso (LNGS), Italy. The main goals of Borexino include the measurement of solar neutrinos and geoneutrinos. The extreme radiopurity and thermal stability of the detector have proven to be valuable assets in achieving these goals. Borexino has not only performed a complete spectroscopy of the dominant pp-chain solar neutrinos but has also provided the first direct experimental evidence of the rare CNO-cycle neutrinos. These measurements have several implications for solar and stellar Physics and further improvements are envisioned using the full dataset. In addition, it has recently presented the first directional measurement of sub-MeV solar neutrinos using the sub-dominant Cherenkov light, through a novel technique called Correlated and Integrated Directionality (CID). This method can be further combined with a typical spectral fit and can also prove valuable for next-generation liquid scintillator detectors. The latest geoneutrino measurement from Borexino included a substantial improvement in the precision as well as the rejection of the no-mantle signal with a high significance. This group report will summarize all these recent solar and geoneutrino results of Borexino.