# Angular and Abundance Distribution of High-energy Gamma Rays and Neutrons Simulated by GEANT4 Code for Solar Flares

## TL;DR

This study uses GEANT4 simulations to analyze the angular and abundance distribution of high-energy gamma rays and neutrons from solar flares, aiming to explain observed high neutron-to-gamma ratios.

## Contribution

It demonstrates that the high neutron-to-gamma ratio observed in solar flares can be reproduced by simulations assuming heavy ion acceleration.

## Key findings

- High n/γ ratio can be explained by heavy ion acceleration.
- Simulations match observed neutron and gamma-ray distributions.
- Heavy ions play a key role in particle production during solar flares.

## Abstract

In the solar flare observed on June 3, 2012, high energy gamma-rays and neutrons were observed. The event includes a remarkable feature of a high neutron/gamma-ratio in the secondary particles. We have examined whether this high n/$\gamma$-ratio can be explained by simulation. As a result of simulations using the GEANT4 program, the high n/$\gamma$-ratio may be reproduced for the case that helium and other heavy ions were dominantly accelerated in the flare.