The 4th International Symposium on Cosmic Rays and Astrophysics (ISCRA-2023)

The indication for 40K geo-antineutrino flux with Borexino phase-III data

27 Jun 2023, 16:00

1h

Hall of B-100 Lecture Room (National Research Nuclear University MEPhI)

Poster Cosmo- and geophysical aspects of cosmic rays at the ground level Poster Session

Speaker

Ivan Karpikov (INR RAS)

Description

We provide the indication of high flux of 40K geo-antineutrino and geo-neutrino (40K-geo-(ν¯+ν)) with Borexino Phase III data. This result was obtained by introducing a new source of single events, namely 40K-geo-(ν¯+ν) scattering on electrons, in multivariate fit analysis of Borexino Phase III data. Simultaneously we obtained the count rates of events from 7Be, pep and CNO solar neutrinos. These count rates are consistent with the prediction of the Low metallicity Sun model SSM B16-AGSS09. MC pseudo-experiments showed that the case of High metallicity Sun and absence of 40K-geo-(ν¯+ν) can not imitate the result of multivariate fit analysis of Borexino Phase III data with introducing 40K-geo-(ν¯+ν) events. We also provide arguments for the high abundance of potassium in the Earth.