USINE: semi-analytical models for Galactic cosmic-ray propagation

TL;DR

USINE is a publicly available semi-analytical code for modeling Galactic cosmic-ray propagation, enabling flexible parameter fitting and efficient analysis of high-precision cosmic-ray data.

Contribution

It introduces new semi-analytical propagation models and a user-friendly, configurable framework for cosmic-ray data analysis.

Findings

Supports multiple propagation models including leaky-box and diffusion models.

Allows free parameter fitting for geometry, transport, and source parameters.

Facilitates statistical analysis of cosmic-ray data with high computational efficiency.

Abstract

I present the first public releases (v3.4 and v3.5) of the USINE code for cosmic-ray propagation in the Galaxy (https://lpsc.in2p3.fr/usine). It contains several semi-analytical propagation models previously used in the literature (leaky-box model, 2-zone 1D and 2D diffusion models) for the calculation of nuclei ($Z=1-30$), anti-protons, and anti-deuterons. For minimisations, the geometry, transport, and source parameters of all models can be enabled as free parameters, whereas nuisance parameters are enabled on solar modulation levels, cross sections (inelastic and production), and systematics of the CR data. With a single ASCII initialisation file to configure runs, its many displays, and the speed associated to semi-analytical approaches, USINE should be a useful tool for beginners, but also for experts to perform statistical analyses of high-precision cosmic-ray data.