# Neutrino spin-flavor oscillations in solar environment

## TL;DR

This paper investigates how solar magnetic fields influence neutrino spin-flavor oscillations, providing analytical models and using experimental data to constrain the magnetic field strength in the solar core.

## Contribution

It offers new analytical models of solar magnetic fields across different regions and examines the impact on neutrino oscillations, including matter effects and distinctions between Dirac and Majorana neutrinos.

## Key findings

- Placed an upper limit on solar core magnetic field strength using Borexino data.
- Analyzed the resonance conditions for neutrino spin-flavor conversion in solar magnetic environments.
- Compared effects of matter on neutrino spin transitions and differences between Dirac and Majorana neutrinos.

## Abstract

We study the phenomenon of neutrino spin-flavor oscillations due to solar magnetic fields. This allows us to examine how significantly the electron neutrinos produced in the solar interior undergo a resonant spin-flavor conversion. We construct analytical models for the solar magnetic field in all the three regions of the Sun. Neutrino spin-flavor oscillations in these magnetic fields are examined by studying the level crossing phenomenon and comparing the two cases of zero and non-zero vacuum mixing respectively. Results from the Borexino experiment are used to place an upper limit on the magnetic field in the solar core. Related phenomena such as effects of matter on neutrino spin transitions and differences between Dirac and Majorana transitions in the solar magnetic fields are also discussed.