Improvement of low energy atmospheric neutrino flux calculation using the JAM nuclear interaction model

TL;DR

This paper improves atmospheric neutrino flux calculations by utilizing the JAM nuclear interaction model, which better aligns with experimental data and enhances flux predictions at balloon altitudes.

Contribution

The study introduces the use of the JAM interaction model in neutrino flux calculations, demonstrating improved agreement with experimental muon flux data compared to previous models.

Findings

JAM model agrees better with HARP experiment data than DPMJET-III.

Modified JAM reproduces muon flux below 1 GeV/c more accurately.

Improvements lead to more precise atmospheric neutrino flux predictions.

Abstract

We present the calculation of the atmospheric neutrino fluxes with an interaction model named JAM, which is used in PHITS (Particle and Heavy-Ion Transport code System). The JAM interaction model agrees with the HARP experiment a little better than DPMJET-III. After some modifications, it reproduces the muon flux below 1~GeV/c at balloon altitudes better than the modified-DPMJET-III which we used for the calculation of atmospheric neutrino flux in previous works. Some improvements in the calculation of atmospheric neutrino flux are also reported.