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arXiv · 2304.02747

The indication for $^{40}$K geo-antineutrino flux with Borexino phase-III data

L. B. Bezrukov·I. S. Karpikov·V. V. Sinev
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Abstract

We provide the indication of high flux of $^{40}$K geo-antineutrino and geo-neutrino ($^{40}$K-geo-($\bar{\nu} + \nu$)) with Borexino Phase III data. This result was obtained by introducing a new source of single events, namely $^{40}$K-geo-($\bar{\nu} + \nu$) scattering on electrons, in multivariate fit analysis of Borexino Phase III data. Simultaneously we obtained the count rates of events from $^7$Be, $pep$ 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 $^{40}$K-geo-($\bar{\nu} + \nu$) can not imitate the result of multivariate fit analysis of Borexino Phase III data with introducing $^{40}$K-geo-($\bar{\nu} + \nu$) events. We also provide arguments for the high abundance of potassium in the Earth.

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L. B. Bezrukov, I. S. Karpikov, V. V. Sinev. 2023-04-05. The indication for $^{40}$K geo-antineutrino flux with Borexino phase-III data. https://arxiv.org/abs/2304.02747

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